Reverse NS Checker
Find all domains using a specific nameserver - Discover DNS hosting relationships!
Enter nameserver hostname or IP address
What is Reverse NS Checker?
A Reverse NS (Nameserver) Checker is a tool that allows you to discover all domains using a specific nameserver. While regular DNS lookups find the nameservers for a domain, reverse NS checking does the opposite—it finds all domains pointing to a particular nameserver. This is valuable for identifying hosting relationships, discovering related websites, and analyzing DNS infrastructure.
Common use cases: Web hosting providers use this to identify clients, security researchers track domain networks, SEO professionals discover competitor networks, and domain administrators verify their DNS configurations. By analyzing nameserver usage patterns, you can understand hosting relationships and infrastructure setups.
Why Use Reverse NS Checker?
🔍 Competitor Analysis
Discover related websites and domains owned by competitors using the same DNS infrastructure.
🏢 Client Discovery
Hosting providers can identify all domains using their nameservers for client management.
🔒 Security Research
Investigate potential domain networks, identify related sites, and track infrastructure changes.
📊 Market Analysis
Analyze hosting provider market share and understand DNS service adoption patterns.
✅ DNS Verification
Verify which domains are properly configured to use your nameservers.
🌐 Network Mapping
Map out domain relationships and understand hosting infrastructure topology.
How to Use Reverse NS Checker
- 1. Enter Nameserver: Type the nameserver hostname (e.g., ns1.cloudflare.com) or IP address you want to check.
- 2. Click Check: Our tool queries DNS databases to find all domains using that nameserver.
- 3. View Results: See complete list of domains with IP addresses, SSL status, registrar info, and creation dates.
- 4. Analyze Data: Review statistics including SSL coverage, active domains, and registrar distribution.
- 5. Export Data: Download results as CSV or copy domain list to clipboard for further analysis.
- 6. Investigate Domains: Use built-in DNS checker links to examine individual domain records.
Popular Nameservers to Check
| Provider | Nameserver | Type |
|---|---|---|
| Cloudflare | ns1.cloudflare.com | CDN/DNS |
| Google Cloud | ns-cloud-a1.googledomains.com | Cloud DNS |
| AWS Route53 | ns-1234.awsdns-12.com | Cloud DNS |
| GoDaddy | ns01.domaincontrol.com | Registrar |
| Namecheap | dns1.registrar-servers.com | Registrar |
| DigitalOcean | ns1.digitalocean.com | Cloud Hosting |
Understanding the Results
Domain Information
Each domain shows its IP addresses, SSL status, registrar, and creation date. This helps you understand the full picture of DNS usage.
SSL Coverage
Shows percentage of domains with SSL certificates. Higher percentages indicate better security practices among the domain owners.
Registrar Distribution
Reveals which domain registrars are most popular among domains using this nameserver. Useful for market analysis.
Related DNS Tools
🌐 DNS Records Checker
Check A, MX, NS, TXT records for any domain.
🔄 Reverse IP Checker
Find all domains hosted on an IP address.
📋 WHOIS Checker
Check domain registration and ownership details.
📜 IP History Checker
View historical IP addresses for domains.
📚 Frequently Asked Questions
Q: What is a reverse NS lookup?
A: Reverse NS lookup finds all domains using a specific nameserver, opposite of regular DNS lookup which finds nameservers for a domain.
Q: Why would I need this tool?
A: It's useful for competitor research, security analysis, hosting provider client discovery, DNS verification, and understanding infrastructure relationships.
Q: Can I search by nameserver IP?
A: Yes, you can search using either the nameserver hostname (e.g., ns1.example.com) or its IP address.
Q: How accurate are the results?
A: Results are based on current DNS configurations and public DNS databases. Some private or recently changed domains may not appear immediately.
Q: Can I export the domain list?
A: Yes! You can copy the domain list to clipboard or export complete results as CSV file with all details.
Q: Is this tool free?
A: Completely free with unlimited lookups. No registration or payment required. Check any nameserver instantly.
🔍 Check Reverse NS Now!
Use our free Reverse NS Checker to discover all domains using any nameserver. Perfect for hosting providers, security researchers, SEO professionals, and domain administrators.
More tools: DNS Records • Reverse IP • WHOIS 🎯