`;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

`; 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 = `

`; 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 = `

`; 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 has supported hundreds of SMEs in clearly understanding domains, helping them minimize the risk of losing their online brand. Grasping information firmly helps you control and secure domain names more effectively.

The importance of checking domain information in digital business strategy

Direct impact on brand & customer trust

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% of users said they have less trust in websites using non-transparent domains (Trustpilot Report, 2022)
– A startup company in Hanoi lost nearly 300 million VND due to the misappropriation of their .com domain after only registering the .vn version without a comprehensive ownership check (anonymous internal case study)

Checking helps secure and prevent fraud

Regularly scanning and verifying domain information helps detect:

– Unauthorized DNS changes
– Domain names expired or transferred without notice
– Phishing campaigns using similar fake domain names

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)

Summary table of domain status & alerts

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

1. Identify the domain management provider

First, you need to identify where the domain name is being managed – it could be GoDaddy, Namecheap, PA Vietnam, or another provider. This helps you know where to access to view DNS configurations, manage SSL, or set security settings.

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

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:

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

Real-world examples & risk warnings

during a domain audit, an SME customer in District 3, HCMC discovered their domain had expired for 3 days and moved to “Redemption Period” status. The cost to restore was $120 USD at 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.

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

Domain ownership information

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

– Registrant Name
– Registrant Organization (if any)
– Primary contact email, address, and phone number

📝 If anonymous (Privacy protection), the system will display a proxy address – this is common with registrars like Namecheap or Google Domains.

Example: A fashion store owner used the domain “examplefashion.vn” and lost it because the domain was in the name of a former partner, and they did not know the email address in WHOIS – leading to a dispute lasting 3 months.

Technical and management information

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

– Registrar: The registrar managing the domain name (e.g., P.A Vietnam)
– Name Server: The system directing traffic to the web host
– Status: Domain name status, for example:
– clientTransferProhibited: transfer is currently locked
– redemptionPeriod: the domain has been renewed late and is suspended

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:

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. Always check WHOIS periodically every 3-6 months, or when changing hosting service providers. Data source: ICANN WHOIS Accuracy Reporting System (2023) – the rate of outdated WHOIS in SMEs accounts for more than 46%.

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.

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

There have been many cases of losing domain names due to forgetting to renew – especially in SME companies. For example: a retail business in HCMC once lost its main domain because it only registered for 1 year and did not receive renewal notices due to an old email.

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

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

Domain security summary

Losing a domain name not only causes brand damage but also affects reputation and SEO. Maintaining basic security strategies as above will ensure your domain is difficult to compromise – regardless of the business size.

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

Set up and periodically check security options

Most registrars now provide the domain lock feature – a security layer preventing unauthorized domain transfers.
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

Warning: Common risks

– Illegally transferred due to expired or hacked emails
– Temporary loss of ownership because of incorrect WHOIS information – violating ICANN regulations
– Loss of traffic and reputation if the domain expires without timely renewal

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

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.

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
• ✔ Use a general company email for registration – avoid using personal emails
• ✔ 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:

Warning: Commonly overlooked risks

– Registering a domain name but not protecting WHOIS information → Easily exploited by competitors.
– Not updating ownership when personnel changes → Risk of losing ownership rights.
– Using unofficial providers → Difficult to regain control when disputes occur.

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

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.

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:

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).

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!