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Nhập mỗi tên miền một dòng (có thể dán URL). Chọn loại bản ghi hoặc "TẤT CẢ" để tra 5 loại phổ biến.
0 domains
Loại Bản Ghi:
Delay between requests:
ms
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Sẵn sàng tra cứu bản ghi DNS...
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`;const ta = root.querySelector('#dns-lines'); const btnRun = root.querySelector('#dns-run'); const btnStop = root.querySelector('#dns-stop'); const btnClear = root.querySelector('#dns-clear'); const typesWrap = root.querySelector('#dns-types'); const statusEl = root.querySelector('#dns-status'); const errorEl = root.querySelector('#dns-error'); const errorTextEl = root.querySelector('#dns-error-text'); const resultsEl = root.querySelector('#dns-results'); const delayInput = root.querySelector('#dns-delay'); const btnCopy = root.querySelector('#dns-copy-table'); const countEl = root.querySelector('#dns-count'); const progressEl = root.querySelector('#dns-progress'); const progressBarEl = root.querySelector('#dns-progress-bar'); const runTextEl = root.querySelector('#run-text');// Type pills với DPS branding const TYPE_LABELS = { 'ALL': 'TẤT CẢ', 'A': 'A', 'CNAME': 'CNAME', 'MX': 'MX', 'NS': 'NS', 'TXT': 'TXT' };let activeType = 'A'; RECORDS.forEach(t => { const b = document.createElement('button'); b.textContent = TYPE_LABELS[t] || t; b.className = 'dns-type-btn'; if (t === activeType) { b.classList.add('active'); } b.addEventListener('click',()=>{ if (isRunning) return; activeType = t; [...typesWrap.children].forEach(c => c.classList.remove('active')); b.classList.add('active'); }); typesWrap.appendChild(b); });// Domain count tracker với DPS colors function updateDomainCount() { const domains = ta.value.split(/\r?\n/) .map(s=>extractHostname(s)) .filter(Boolean); countEl.textContent = `${domains.length} tên miền`; if (domains.length > 100) { countEl.style.background = 'rgba(220,38,38,0.9) !important'; countEl.style.color = 'white !important'; } else if (domains.length > 50) { countEl.style.background = 'rgba(245,158,11,0.9) !important'; countEl.style.color = 'white !important'; } else if (domains.length > 0) { countEl.style.background = 'rgba(50,181,97,0.9) !important'; countEl.style.color = 'white !important'; } else { countEl.style.background = 'rgba(21,21,119,0.9) !important'; countEl.style.color = 'white !important'; } }ta.addEventListener('input', updateDomainCount); updateDomainCount();function clampDelay(){ let v = Number(delayInput.value || 0); if (!Number.isFinite(v) || v { if (e.key === '-') e.preventDefault(); });function extractHostname(input){ if(!input) return ''; try{ return new URL(input).hostname.replace(/\.$/,''); } catch(e){ return String(input).trim().replace(/^https?:\/\//i,'').replace(/^\/*/,'').split('/')[0].split('?')[0].replace(/\.$/,''); } }function sleep(ms){ return new Promise(r=>setTimeout(r, ms)); }function clearError(){ errorEl.style.display='none'; errorTextEl.textContent=''; } function showError(msg){ errorEl.style.display='flex'; errorTextEl.textContent=msg; } function setStatus(msg){ statusEl.textContent = msg; }function updateProgress(current, total) { if (total === 0) { progressEl.style.display = 'none'; return; } progressEl.style.display = 'block'; const percentage = Math.min((current / total) * 100, 100); progressBarEl.style.width = `${percentage}%`; }// Render table với DPS branding - Sử dụng div thay vì table elements function ensureTable(){ if(resultsEl.firstChild && resultsEl.firstChild.classList && resultsEl.firstChild.classList.contains('dns-table')) return resultsEl.firstChild; resultsEl.innerHTML = ''; const table = document.createElement('div'); table.className = 'dns-table'; const isMobile = window.innerWidth

Domain Name
Eliminate
Name
TTL
Data

`; resultsEl.appendChild(table); return table; }const allRows = []; function appendRows(rows){ const table = ensureTable(); const tbody = table.querySelector('.dns-table-body'); const frag = document.createDocumentFragment(); const isMobile = window.innerWidth { allRows.push(r); const tr = document.createElement('div'); tr.className = 'dns-table-row'; let dataColor = '#374151'; if (r.data === '(không có dữ liệu)') dataColor = '#9ca3af'; else if (r.data && r.data.startsWith('Lỗi:')) dataColor = '#dc2626'; tr.innerHTML = `

${r.domain}
${r.type}
${r.name||''}
${r.ttl??''}
${r.data||''}

`; frag.appendChild(tr); }); tbody.appendChild(frag); btnCopy.disabled = false; btnCopy.classList.remove('success'); }async function queryDoH(domain, type){ const base = 'https://dns.google/resolve'; const params = new URLSearchParams(); params.set('name', domain); params.set('type', TYPE_CODE[type]); const url = `${base}?${params.toString()}`; const res = await fetch(url, { headers: { 'Accept':'application/json' }}); if(!res.ok) throw new Error(`HTTP ${res.status}`); return await res.json(); }let abortFlag = false; let isRunning = false;btnStop.addEventListener('click', ()=>{ abortFlag = true; setStatus('🛑 Đang dừng...'); });btnClear.addEventListener('click', () => { if (isRunning) return; resultsEl.innerHTML = `

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Sẵn sàng tra cứu bản ghi DNS...
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`; allRows.length = 0; btnCopy.disabled = true; btnCopy.classList.remove('success'); clearError(); setStatus(''); progressEl.style.display = 'none'; });btnRun.addEventListener('click', async ()=>{ if (isRunning) return; clearError(); allRows.length = 0; abortFlag = false; isRunning = true;btnRun.disabled = true; runTextEl.textContent = '⏳ Đang chạy...'; btnStop.style.display = 'block'; btnClear.style.display = 'none'; [...typesWrap.children].forEach(b => { b.style.cursor = 'not-allowed'; b.style.opacity = '0.6'; });const delay = clampDelay();const domains = ta.value.split(/\r?\n/) .map(s=>extractHostname(s)) .filter(Boolean);if (!domains.length){ showError('Vui lòng nhập ít nhất 1 tên miền.'); resetUIState(); return; } if (domains.length > 100){ showError('Giới hạn 100 tên miền mỗi lần để tránh quá tải. Hãy chia nhỏ danh sách.'); resetUIState(); return; }const types = (activeType==='ALL') ? [...POPULAR] : [activeType]; const totalQueries = domains.length * types.length;resultsEl.innerHTML = ''; ensureTable();let completed = 0; for (let i=0; i 0){ const rows = json.Answer.map(a=>({ domain:d, type:t, name:a.name, ttl:a.TTL, data:a.data })); appendRows(rows); } else if (json && Array.isArray(json.Authority) && json.Authority.length > 0){ const rows = json.Authority.map(a=>({ domain:d, type:t, name:a.name, ttl:a.TTL, data:a.data })); appendRows(rows); } else { appendRows([{ domain:d, type:t, name:'', ttl:'', data:'(không có dữ liệu)' }]); } }catch(e){ appendRows([{ domain:d, type:t, name:'', ttl:'', data:`Lỗi: ${e.message}` }]); } completed++; updateProgress(completed, totalQueries); if (completed { b.style.cursor = 'pointer'; b.style.opacity = '1'; }); }function escapeCell(v){ if (v == null) return ''; const s = String(v); return s.replace(/\t/g, ' ').replace(/\r?\n/g, ' '); } function rowsToTSV(rows){ const header = ['Tên Miền','Loại','Tên','TTL','Dữ Liệu']; const lines = [header.join('\t')].concat(rows.map(r => [r.domain, r.type, r.name||'', r.ttl??'', r.data||''].map(escapeCell).join('\t'))); return lines.join('\n'); } async function copyText(text){ if (navigator.clipboard && navigator.clipboard.writeText){ await navigator.clipboard.writeText(text); } else { const ta = document.createElement('textarea'); ta.value = text; document.body.appendChild(ta); ta.select(); document.execCommand('copy'); document.body.removeChild(ta); } } btnCopy.addEventListener('click', async ()=>{ if (!allRows.length){ setStatus('❌ Không có dữ liệu để sao chép.'); return; } try{ await copyText(rowsToTSV(allRows)); setStatus('✅ Đã sao chép bảng vào clipboard!'); const originalText = btnCopy.textContent; btnCopy.textContent = '✅ Đã sao chép!'; btnCopy.classList.add('success'); setTimeout(() => { btnCopy.textContent = originalText; btnCopy.classList.remove('success'); }, 2000); }catch(e){ setStatus('❌ Sao chép thất bại: ' + e.message); } });// Window resize handler let resizeTimeout; window.addEventListener('resize', () => { clearTimeout(resizeTimeout); resizeTimeout = setTimeout(() => { if (resultsEl.firstChild && resultsEl.firstChild.classList && resultsEl.firstChild.classList.contains('dns-table')) { const currentRows = [...allRows]; allRows.length = 0; resultsEl.innerHTML = ''; if (currentRows.length > 0) { appendRows(currentRows); } } }, 100); });// Initialize copy button state btnCopy.disabled = true; })();Checking domain information is the first and most important step to protect your digital assets. 901 out of 1000 small businesses risk losing domain usage rights due to lack of management knowledge.

DPS.MEDIA đã hỗ trợ hàng trăm SMEs hiểu rõ về domain giúp họ giảm thiểu nguy cơ mất thương hiệu trực tuyến. Việc nắm chắc thông tin giúp bạn kiểm soát và bảo mật tên miền hiệu quả hơn.
The importance of checking domain information in digital business strategy

The importance of checking domain information in digital business strategy

Ảnh hưởng trực tiếp đến thương hiệu & niềm tin khách hàng

Domain name is an essential part of brand identity in the digital environment. If domain information is not fully checked and verified, businesses may face risks such as duplicate domains, easy impersonation, or association with harmful content.

– 60% người dùng cho biết họ ít tin tưởng vào website sử dụng domain không minh bạch (Trustpilot Report, 2022)
– Một công ty startup tại Hà Nội đã mất gần 300 triệu đồng do bị chiếm dụng domain .com sau khi chỉ đăng ký bản .vn mà không kiểm tra toàn diện sở hữu (case study nội bộ ẩn danh)

Tip: Always check the WHOIS status and domain ownership period. Set renewal reminders to avoid losing control.

Checking helps secure and prevent fraud

Regularly scanning and verifying domain information helps detect:

– Các thay đổi DNS trái phép
– Tên miền hết hạn hoặc bị chuyển nhượng không thông báo
– Các chiến dịch phishing sử dụng tên miền giả tương tự

A survey by ICANN (2023) shows up to 12% of SMEs were scammed via emails impersonating similar domains.

Checklist: 5 things to do when managing a domain

  • Check WHOIS information periodically (every 6 months)
  • Enable domain lock mode (Domain Lock)
  • Back up DNS configuration and check MX record
  • Enable auto-renewal and set notifications before expiration
  • Monitor domain variants (typosquatting)

Bảng tổng hợp trạng thái tên miền & cảnh báo

Domain nameStatusExpiration dateRecommendations
example.comActive12/08/2025Schedule auto-renewal
example.vnExpiring soon03/10/2024Renew now
examp1e.comBeing abusedN/AReport and register variants

Brief takeaway:

Checking domain information not only protects your brand but is also an essential part of safe and efficient operation on digital platforms. A small action can prevent major risks.
Steps to check domain information accurately and quickly

Steps to check domain information accurately and quickly

1. Identify the domain management provider

Trước tiên, bạn cần xác định tên miền đang được quản lý tại đâu – có thể là GoDaddy, Namecheap, PA Vietnam, hoặc nhà cung cấp khác. Việc này giúp bạn biết mình cần truy cập vào đâu để xem cấu hình DNS, quản lý SSL hay cài đặt bảo mật.

  • Visit https://whois.domaintools.com/ to look up information
  • Note the Registrar and Name Server

TIP: If you use a CMS like WordPress, check which hosting the DNS is pointing to in order to avoid service interruptions.

2. Lookup detailed WHOIS information

WHOIS is a common method to check the status and ownership information of a domain. However, many providers now apply WHOIS Privacy policies to hide registrant information for security reasons.

Below is a sample WHOIS information table that may appear after lookup:

InformationDetails
domain Nameexampledomain.com
RegistrarNamecheap, Inc.
Expiry Date2025-09-10
Name serverns1.digitalocean.com

3. Checklist of specific items to check

After obtaining information from WHOIS, you should proceed to review according to the following action list:

  • ✔ Is the domain activated and still valid?
  • ✔ Is WHOIS Privacy (personal information hidden) applied?
  • ✔ Does the nameserver point correctly to the server in use?
  • ✔ Verify the domain admin email to avoid losing access
  • ✔ Check DNS settings: MX, TXT (SPF/DKIM), A records

TIP: It is recommended to set a reminder 30 days before the domain expires to ensure uninterrupted operation.

Ví dụ thực tế & cảnh báo rủi ro

trong một cuộc audit tên miền, một khách hàng SMEs tại Q.3, HCM phát hiện domain hết hạn 3 ngày và bị chuyển sang trạng thái “Redemption Period”. Chi phí để khôi phục là $120 USD tại Name.com (2023).

According to ICANN WHOIS Accuracy Reporting System – Report 2023, 18% of domains are registered with incorrect emails or missing contact information, causing difficulties in renewal and complaint retrieval.

Note: A domain with incorrect information can become a serious security vulnerability for both the website and the company's email system.

Brief takeaway

Periodic domain information checks should be considered a basic security procedure every 6 months. Prioritize maintaining accurate contact, controlling DNS, and monitoring expiration dates to minimize any risk of digital operation disruption.
Decoding important fields in WHOIS and how to interpret them correctly

Decoding important fields in WHOIS and how to interpret them correctly

Domain ownership information

This is the main section that helps determine who is the legal owner of the domain. Common fields include:

– Registrant Name (Tên người đăng ký)
– Registrant Organization (Tổ chức sở hữu – nếu có)
– Email, địa chỉ và số điện thoại liên hệ chính

📝 Nếu ẩn danh (Privacy protection), hệ thống sẽ hiển thị địa chỉ proxy – điều này phổ biến với các registrar như Namecheap hoặc Google Domains.

Ví dụ: Một chủ cửa hàng thời trang dùng tên miền “examplefashion.vn” bị mất do domain đứng tên đối tác cũ, không biết địa chỉ email trong WHOIS – dẫn tới tranh chấp suốt 3 tháng.

Technical and management information

You need to pay attention to the following fields to avoid unwanted domain loss:

– Registrar: Nhà đăng ký quản lý tên miền (ví dụ: P.A Vietnam)
– Name Server: Hệ thống điều hướng lưu lượng về host web
– Status: Trạng thái tên miền, ví dụ:
clientTransferProhibited: transfer is currently locked
redemptionPeriod: the domain has been renewed late and is suspended

Tip: Kiểm tra định kỳ trạng thái domain để phát hiện sớm các cảnh báo như “pendingDelete” hoặc “onHold”.

Accurate WHOIS check checklist

  • Is the owner's information accurate?
  • Is the admin email still accessible?
  • Is the domain status locked?
  • Is the registrar reputable and provides good support?

Comparison table of common domain statuses:

StatusMeaningImpact
ActiveDomain is activeNo issues
clientHoldTemporarily suspended due to payment issuesWebsite is inaccessible
redemptionPeriodExpired, awaiting redemptionIncreased costs and risk of losing the domain

Takeaway: Reading WHOIS is not hard, but must be done correctly

Understanding WHOIS data correctly helps you protect your brand, avoid the risk of losing domain control and maintain stable operations. Luôn kiểm tra WHOIS định kỳ mỗi 3-6 tháng, hoặc khi thay đổi đơn vị dịch vụ hosting.Nguồn số liệu: Báo cáo ICANN WHOIS Accuracy Reporting System (2023) – tỷ lệ WHOIS lỗi thời ở các SMEs chiếm hơn 46%.
Domain security strategies to avoid risks and loss of ownership

Domain security strategies to avoid risks and loss of ownership

1. Enable domain lock and two-step verification

One of the most basic security steps is to enable Domain Lock to prevent unauthorized domain transfers. Additionally, make sure the domain admin account has enabled two-factor authentication (2FA) to enhance security.

Tip: Use an authenticator app like Google Authenticator instead of SMS to avoid SIM swap risks.

2. Use separate contact info and update regularly

Use a dedicated email for domain management, avoid using personal or shared internal emails. According to Verisign's 2023 report, 26% of domain losses stem from weak or leaked admin emails.

  • Update contact information every 6-12 months
  • Avoid public WHOIS if not necessary
  • Enable Privacy Protection if appropriate

3. Register long-term and monitor expiration dates

Đã có nhiều trường hợp mất tên miền vì quên gia hạn – đặc biệt ở các công ty smes. Ví dụ: một doanh nghiệp bán lẻ tại TP.HCM từng bị mất domain chính vì chỉ đăng ký 1 năm và không nhận thông báo gia hạn do email cũ.

Below is a short tracking table to help you manage domain expiration effectively:

Domain nameExpiration dateRe-register
example.com12/08/202510/07/2025
thuonghieu.vn03/03/202401/02/2024

Domain security checklist

  • ☑️ Enable domain lock (Domain Lock)
  • ☑️ Enable 2FA for admin account
  • ☑️ Use a dedicated email for the domain
  • ☑️ Renew for at least 2-3 years at a time
  • ☑️ Monitor expiration to avoid service disruption

Note: If you use a third-party service, request direct access to the domain admin system to mitigate risks.

Domain security summary

Mất tên miền không chỉ gây thiệt hại thương hiệu mà còn ảnh hưởng đến uy tín và SEO.Việc duy trì các chiến lược bảo mật cơ bản như trên sẽ đảm bảo domain của bạn khó bị xâm phạm – dù là ở bất kỳ quy mô doanh nghiệp nào.
Guide to updating and effectively managing domain information at the registrar

Guide to updating and effectively managing domain information at the registrar

Update owner information accurately and completely

Maintaining accurate ownership information helps you avoid the risk of losing control of your domain. According to ICANN (2023), 12% of domain hijacking cases stem from incorrect WHOIS information.
List of information to check periodically:

  • Owner's name matches the business registration license (if any)
  • Contact email address is always active
  • Valid phone number and postal address
  • Technical and admin information must be clearly separated

Tip: Use a separate email to manage the domain, do not use a personal email that is easily compromised.

Set up and periodically check security options

Most registrars now provide the domain lock feature – một lớp bảo mật ngăn việc chuyển đổi tên miền trái phép.
Example: a DPS.MEDIA client almost lost the right to use their domain because they hadn't enabled domain lock, even after owning it for 5 years.

Recommended action list:

  • Enable 2FA (two-factor authentication) for the domain management account
  • Always use a strong password, change it every 6 months
  • Enable domain lock as soon as you register the domain
  • Set up email alerts when information changes

Periodic information checklist

Item to checkRecommended frequencyNote
WHOIS informationEvery 3 monthsCheck name, email, address
Domain lockAfter each changeEnsure it is not unintentionally unlocked
Security alertMonthlyView activity log

Warning: Common risks

– Bị chuyển nhượng không hợp pháp do email hết hạn hoặc bị hack
– Mất quyền sở hữu tạm thời vì WHOIS sai thông tin – vi phạm quy định của ICANN
– Mất lượng truy cập và uy tín nếu domain hết hạn mà không gia hạn đúng lúc

Tip: Register the domain for at least 2-3 years and enable auto-renewal to avoid interruptions.

Takeaway:

The effective domain management and security is not only a legal responsibility but also a vital factor for your digital brand. Setting up periodic maintenance reminders like server check schedules will help you minimize risks and better protect your online assets.
Optimize domain management processes to enhance online brand reputation

Optimize domain management processes to enhance online brand reputation

Why should you manage your domain strictly?

Domain management is not just a mandatory technical step, but also a strategic factor to safeguard brand image. According to Cisco's Global Cybersecurity Report (2023), over 33% of phishing incidents stem from poor domain control.

A recent example is a local retail business losing control of its main domain simply because it expired and was not renewed in time. Result: lost 63% of organic traffic in just 2 weeks.

TIP: Always enable auto-renewal with email alerts 30 days in advance.

Suggested standard process to optimize domain management

Below is a suggested checklist to help you effectively control domain activities and protect your brand:

  • ✔ Periodically check WHOIS registration information (at least once every quarter)
  • ✔ Enable Domain Lock to prevent unauthorized transfers
  • ✔ Sử dụng email công ty chung để đăng ký – tránh dùng email cá nhân
  • ✔ Update DNS accurately, avoid incorrect pointing or exposing internal structure
  • ✔ Set up 2FA for domain management accounts

Centralized multi-platform domain administration

If your business owns multiple domains for sub-brands or marketing campaigns, you should centralize management using a dashboard or centralized service. Some platforms like Google Domains or Namecheap allow you to sync and monitor all domains on one console.

Example of a domain management statistics table:

Domain nameExpiration dateStatusDomain Lock
thuonghieuabc.vn10/11/2024Active
event2024.com03/03/2025Active
archived-project.net12/07/2023Expired

Warning: Commonly overlooked risks

– Đăng ký tên miền nhưng không bảo vệ thông tin WHOIS → Dễ bị đối thủ khai thác.
– Không cập nhật ownership khi thay đổi nhân sự → Rủi ro mất quyền sở hữu.
– Dùng nhà cung cấp không chính thống → Khó lấy lại quyền kiểm soát khi xảy ra tranh chấp.

Note: When transferring domain ownership, always have confirmation via valid authorization email.

Key takeaway

A clear, secure, and regularly controlled domain management process will help your online brand maintain credibility, avoid hijacking, and effectively support long-term marketing and brand recognition.
Reliable tools and software to check and secure domains for small businesses

Reliable tools and software to check and secure domains for small businesses

Free domain information checking tools

To clearly understand the status and history of your domain, you need to regularly use information lookup tools. Some free, easy-to-use solutions:

  • Whois Lookup (ICANN, Whois.com): Lookup owner information, registration date, provider.
  • DomainTools: Provides trust scores and domain update history.
  • MXToolbox: Check DNS setup, blacklist, and email servers related to the domain.

💡 Tip: It is recommended to check periodically every 3 months to detect unusual changes due to hackers or unauthorized transfers.

Domain security software for SMEs

Small businesses are often targets of domain attacks because they invest less in security. Some reliable software to consider:

  • Cloudflare: DNS protection, DDoS prevention, helps speed up connections.
  • Google Domains (or Google Workspace): Integrates two-factor authentication and abnormal activity alerts.
  • SSL Labs by Qualys: Assess the strength of SSL certificates.

Quarterly domain management and security checklist

The table below is a simple quarterly checklist:

CategoryTimeStatus
Domain renewal30 days before expiration✅ / ⛔
Update WHOIS contact informationEvery 3 months✅ / ⛔
Check DNS settingsQuarterly✅ / ⛔
Check SSL certificate operationQuarterly✅ / ⛔

Real-life example: Small vulnerability, big loss

In 2022, an SME in the interior design sector let their domain expire for 3 days due to forgetting to renew it. Another party bought the domain and exploited its previous reputation to scam customers via email. This incident caused losses of over 80 million VND and nearly a month of suspended sales operations (Source: VietnamBiz, 2022).

⚠️ Warning: Tên miền hết hạn sẽ trở thành tài sản công cộng – bất cứ ai cũng có thể mua lại và sử dụng sai mục đích.

Brief takeaway

Businesses should proactively use domain checking tools and regularly implement domain security solutions. This is not only part of digital brand protection, but also an essential defense layer against increasing technological risks.

Sincere feedback

Checking domain information helps businesses control ownership and minimize security risks. Proper domain management is the first step in a sustainable digital marketing strategy.

Start reviewing the information of the domains you own. Update admin contacts, set up security, and register for the long term to ensure absolute safety. You should also learn about SSL, DNS, and effective hosting management. These are important factors directly related to your website’s performance and reliability.

DPS.MEDIA is always ready to accompany Vietnamese businesses on their digital transformation journey. Don’t forget to leave a comment if you have questions or want to share your experience about domains!

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