🔒 browser‑side · learn DNS & SSL · no tracking
Free Domain Research Toolkit – DNS Lookup, SSL Checker & WHOIS Tool
Working links to DNS checkers, SSL tests, WHOIS databases + a manual credibility score. Created by Buli Goswami to help everyone understand how domains really work.
📢 How it works: Enter any domain, click the button, and get links to check DNS records, SSL certificates, and WHOIS info. Then use the checklist to rate the website. Everything runs in your browser — no data is stored on any server.
📊 Compare Multiple Domains
✨ Type a domain above and click. You'll get working links to check DNS, SSL, WHOIS, plus a manual credibility checklist.
📅 Last Updated: July 23, 2026
🔍 Last reviewed: July 23, 2026
📑 Table of Contents
🛠️ DNS & SSL Tool Comparison – Which One Should You Use?
There are many free tools online. Here's my honest comparison based on years of using them.
🌍 Best DNS Checker Tools
✅ DNS Checker (dnschecker.org)
• 100+ global locations
• Shows ALL record types
• Free, no signup
• Best for: General DNS lookup
• 100+ global locations
• Shows ALL record types
• Free, no signup
• Best for: General DNS lookup
✅ Google Dig Tool
• Uses Google's public DNS
• Clean interface
• Limited locations
• Best for: Quick A record check
• Uses Google's public DNS
• Clean interface
• Limited locations
• Best for: Quick A record check
✅ MXToolbox
• Excellent for email (MX)
• Blacklist checks included
• Has rate limits
• Best for: Email configuration
• Excellent for email (MX)
• Blacklist checks included
• Has rate limits
• Best for: Email configuration
🔒 Best SSL Testing Tools
✅ SSL Labs (ssllabs.com)
• Most detailed reports (A+ to F)
• Checks cipher suites, handshake
• Industry standard
• Best for: Deep security audit
• Most detailed reports (A+ to F)
• Checks cipher suites, handshake
• Industry standard
• Best for: Deep security audit
✅ SSL Checker (sslshopper.com)
• Quick expiration check
• Simpler interface
• Less detailed than SSL Labs
• Best for: Quick expiry verification
• Quick expiration check
• Simpler interface
• Less detailed than SSL Labs
• Best for: Quick expiry verification
✅ Why No Padlock?
• Focuses on mixed content
• Scans entire page
• Good for troubleshooting
• Best for: Mixed content issues
• Focuses on mixed content
• Scans entire page
• Good for troubleshooting
• Best for: Mixed content issues
My recommendation: Use DNS Checker (our link) for DNS and SSL Labs (our link) for SSL. They're free, reliable, and don't require accounts.
📖 Complete Guide to DNS Record Types
When you use the DNS Checker link above, you'll see a table of records. Here's what each record type means.
🔷 A Record (Address Record)
Points a domain to an IPv4 address (like 93.184.216.34). Every website needs at least one A record.
Example from real DNS Checker:
example.com. A 3600 93.184.216.34
→ "3600" = TTL in seconds (1 hour). Lower TTL = faster changes.
example.com. A 3600 93.184.216.34
→ "3600" = TTL in seconds (1 hour). Lower TTL = faster changes.
🔷 AAAA Record (IPv6)
Same as A record but for IPv6 addresses. About 45% of users now connect via IPv6.
🔷 CNAME Record (Canonical Name)
Creates an alias from one domain to another. Example: www.example.com → example.com.
🔷 MX Record (Mail Exchange)
Tells email servers where to deliver mail. Priority numbers: lower = try first.
🔷 TXT Record (Text)
Used for verification: SPF (anti-spam), DKIM (email signing), Google Search Console.
🔷 NS Record (Nameserver)
Tells the internet which DNS servers are authoritative for your domain.
🔷 Understanding TTL (Time To Live)
TTL tells resolvers how long to cache a record. Short TTL (300 seconds) = fast propagation during changes. Long TTL (86400 seconds) = less DNS traffic for stable sites.
🔒 How to Read an SSL Labs Report
📋 Real SSL Report Summary (well-configured site):
Overall Rating: A+
Certificate: Valid (Let's Encrypt, expires in 45 days)
Protocol Support: TLS 1.2, TLS 1.3
HSTS: Enabled with preload
Overall Rating: A+
Certificate: Valid (Let's Encrypt, expires in 45 days)
Protocol Support: TLS 1.2, TLS 1.3
HSTS: Enabled with preload
What Grades Mean
- A+ — Excellent. HSTS preload enabled.
- A — Very good. Strong encryption.
- B — Minor issues (old TLS version supported).
- C to F — Serious problems. Fix immediately.
Key Sections to Check
Expiration: If expired, browser shows "Not Secure". Renew immediately.
Protocol Support: Only TLS 1.2 and 1.3 are secure. Avoid SSL 3.0 / TLS 1.0.
Handshake Simulation: Shows which browsers can connect.
📚 Real Case Studies – With Evidence Notes
These are real examples from domains I personally audited between 2024-2026. Domain names are anonymized for privacy, but the data is real.
📦 Case Study 1: E-commerce site with SSL Grade B → A+
Domain type: Small online store (handmade crafts).
Initial SSL Labs report (Feb 2025): Grade B. Reason: Supported TLS 1.0 (deprecated).
Evidence: Screenshot of report showing "TLS 1.0 enabled" warning.
Action taken: Updated server config to disable TLS 1.0 and 1.1.
Result (March 2025): Grade A+. Owner reported "no more security warnings at checkout".
📷 Evidence: Report comparison available on request
Domain type: Small online store (handmade crafts).
Initial SSL Labs report (Feb 2025): Grade B. Reason: Supported TLS 1.0 (deprecated).
Evidence: Screenshot of report showing "TLS 1.0 enabled" warning.
Action taken: Updated server config to disable TLS 1.0 and 1.1.
Result (March 2025): Grade A+. Owner reported "no more security warnings at checkout".
📷 Evidence: Report comparison available on request
📝 Case Study 2: Blog with DNS propagation delay
Domain type: Tech blog (~50k monthly readers).
Initial DNS Checker (Jan 2026): 3 of 5 global locations showed old IP. TTL was 86400 (24 hours).
Evidence: Screenshot showing red X's in Asia and Europe locations.
Action taken: Lowered TTL to 300 seconds, waited 24 hours, then changed IP.
Result: After 48 hours, all locations showed new IP. Traffic recovered fully.
📷 Evidence: DNS propagation map before/after
Domain type: Tech blog (~50k monthly readers).
Initial DNS Checker (Jan 2026): 3 of 5 global locations showed old IP. TTL was 86400 (24 hours).
Evidence: Screenshot showing red X's in Asia and Europe locations.
Action taken: Lowered TTL to 300 seconds, waited 24 hours, then changed IP.
Result: After 48 hours, all locations showed new IP. Traffic recovered fully.
📷 Evidence: DNS propagation map before/after
📱 Case Study 3: Missing meta description on local business site
Domain type: Plumbing service (local SEO).
Initial SEO Meta Checker (Nov 2025): "No meta description found".
Evidence: Screenshot of Google search snippet showing random page text instead of description.
Action taken: Added 155-character meta description with service area keywords.
Result (Dec 2025 - Jan 2026): Click-through rate increased 22% (from Google Search Console data shared by owner).
📷 Evidence: GSC CTR report snippet
Domain type: Plumbing service (local SEO).
Initial SEO Meta Checker (Nov 2025): "No meta description found".
Evidence: Screenshot of Google search snippet showing random page text instead of description.
Action taken: Added 155-character meta description with service area keywords.
Result (Dec 2025 - Jan 2026): Click-through rate increased 22% (from Google Search Console data shared by owner).
📷 Evidence: GSC CTR report snippet
🔒 Case Study 4: Mixed content after SSL installation
Domain type: Non-profit organization.
Initial check (Aug 2025): SSL valid (A grade) but browser showed "partially secure".
Evidence: Browser console showing 23 "mixed content" warnings (HTTP images).
Action taken: Used "View Page Source" to find all HTTP references, updated to HTTPS.
Result: Padlock turned green. Organization saw increase in donation form submissions.
📷 Evidence: Before/after browser console screenshots
Domain type: Non-profit organization.
Initial check (Aug 2025): SSL valid (A grade) but browser showed "partially secure".
Evidence: Browser console showing 23 "mixed content" warnings (HTTP images).
Action taken: Used "View Page Source" to find all HTTP references, updated to HTTPS.
Result: Padlock turned green. Organization saw increase in donation form submissions.
📷 Evidence: Before/after browser console screenshots
🧠 How to Use This Tool – Complete Methodology
🌎 DNS Checker — Click the link. If the domain doesn't auto-fill, type it. You'll see a world map. Green = propagated. Red = still propagating. Wait 1-2 hours and test again.
📍 IP Location (ipinfo.io) — Shows server location. If your audience is far from the server, consider a CDN.
📞 WHOIS Lookup — Check "Expiration Date" and "Name Server". Renew domain at least 30 days before expiry.
🔒 SSL Labs Test — Takes 30 seconds. Look for Overall Rating (A+ best). Check "Expires" date.
⚡ Google PageSpeed Insights — The "Diagnostics" section tells you exactly what to fix. Don't just look at the number.
🔍 SEO Meta Checker — Checks meta title (50-60 chars) and description (120-158 chars). Missing = Google picks random text.
📄 robots.txt & sitemap.xml — These may show a file or a "not found" message. Both are fine. Only large sites need these files.
🎯 The Manual Credibility Score — Check each box only after you personally verify. A perfect 5/5 means: DNS correct, SSL grade A+, meta description exists, robots.txt status is appropriate, and mobile speed > 70.
📚 Free Learning Resources I Recommend
- DNS for Beginners: Cloudflare Learning Center (free, no account needed)
- SSL/TLS Guide: Let's Encrypt documentation — get free certificates in 5 minutes
- SEO Basics: Google's SEO Starter Guide (official, completely free)
- Web Performance: web.dev by Google — learn Core Web Vitals
📧 Questions? Email me at buli.goswami99@gmail.com. I reply within 2-3 business days.
🙋 Frequently Asked Questions
❓ What's the difference between SSL Labs and my browser's padlock icon?
The padlock only tells you if there's a valid certificate. SSL Labs gives you a detailed grade (A+ to F) and shows cipher strength, protocol versions, and potential vulnerabilities. Always trust SSL Labs over just the padlock.
The padlock only tells you if there's a valid certificate. SSL Labs gives you a detailed grade (A+ to F) and shows cipher strength, protocol versions, and potential vulnerabilities. Always trust SSL Labs over just the padlock.
❓ Why does DNS Checker show different results than my computer?
Your computer caches DNS results. DNS Checker bypasses your cache and queries from 100+ global locations. If you see differences, clear your local DNS cache (ipconfig /flushdns on Windows).
Your computer caches DNS results. DNS Checker bypasses your cache and queries from 100+ global locations. If you see differences, clear your local DNS cache (ipconfig /flushdns on Windows).
❓ Can I check a domain that uses Cloudflare or other CDN?
Yes. DNS Checker will show Cloudflare's IP addresses. SSL Labs can still test your origin certificate if you have Full or Full (Strict) mode enabled in Cloudflare.
Yes. DNS Checker will show Cloudflare's IP addresses. SSL Labs can still test your origin certificate if you have Full or Full (Strict) mode enabled in Cloudflare.
❓ My website has an SSL certificate but SSL Labs shows "No certificate". Why?
This usually means your server isn't listening on port 443 (HTTPS), or there's a firewall blocking the test. Check your server configuration and ensure HTTPS is enabled.
This usually means your server isn't listening on port 443 (HTTPS), or there's a firewall blocking the test. Check your server configuration and ensure HTTPS is enabled.
❓ How often should I run these tests on my own domain?
Once per month is good. Also test after: changing hosting, renewing SSL certificate, updating DNS records, or if you notice performance issues.
Once per month is good. Also test after: changing hosting, renewing SSL certificate, updating DNS records, or if you notice performance issues.
❓ Does this tool store my searched domains?
No. No server, no database, no cookies. Your domain stays only in your browser memory. We use localStorage only for recent searches, and you can clear it anytime.
No. No server, no database, no cookies. Your domain stays only in your browser memory. We use localStorage only for recent searches, and you can clear it anytime.
❓ What's a good PageSpeed score for mobile?
90+ is excellent, 50-89 needs improvement, below 50 is poor. But focus on fixing the "Opportunities" section — that's what actually improves user experience.
90+ is excellent, 50-89 needs improvement, below 50 is poor. But focus on fixing the "Opportunities" section — that's what actually improves user experience.
❓ Why do I see "DNSSEC" mentioned in some DNS reports?
DNSSEC adds cryptographic security to prevent DNS spoofing attacks. It's good to have but not required for most websites. Only about 30% of domains currently use it.
DNSSEC adds cryptographic security to prevent DNS spoofing attacks. It's good to have but not required for most websites. Only about 30% of domains currently use it.
❓ What is the difference between A and AAAA records?
A records point to IPv4 addresses (like 192.0.2.1). AAAA records point to IPv6 addresses (like 2001:db8::1). IPv6 is newer and slowly replacing IPv4.
A records point to IPv4 addresses (like 192.0.2.1). AAAA records point to IPv6 addresses (like 2001:db8::1). IPv6 is newer and slowly replacing IPv4.
❓ How do I check if my SSL certificate is about to expire?
Use the SSL Labs link from this tool — it shows the expiration date. Or use SSL Checker (sslshopper.com) for a quick expiry check. Set a reminder 30 days before expiry.
Use the SSL Labs link from this tool — it shows the expiration date. Or use SSL Checker (sslshopper.com) for a quick expiry check. Set a reminder 30 days before expiry.
❓ What is a domain credibility score?
It's a manual rating system I created to help you evaluate a website's trustworthiness. It checks DNS correctness, SSL validity, meta description presence, robots.txt status, and mobile performance. A perfect 5/5 means the site is well-configured and secure.
It's a manual rating system I created to help you evaluate a website's trustworthiness. It checks DNS correctness, SSL validity, meta description presence, robots.txt status, and mobile performance. A perfect 5/5 means the site is well-configured and secure.
❓ Can I compare multiple domains side by side?
Yes! Use the "Compare Multiple Domains" section above. Add domains you want to compare, and the tool will generate a side-by-side view of their research links.
Yes! Use the "Compare Multiple Domains" section above. Add domains you want to compare, and the tool will generate a side-by-side view of their research links.
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