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Reverse NS Checker
Identify all websites and domain names sharing a specific nameserver host.
✓ Free✓ No signup✓ Privacy first✓ Runs in your browser
How it works
Find matches in three steps
1. Enter nameserver host
Input the nameserver address (like ns1.example.com) in the field.
2. Execute lookup
Search registry records to find all domains sharing the nameserver.
3. Analyze domain lists
Review the list of domains linked to the target nameserver configuration.
FAQ
Common questions
This lookup tool queries WHOIS databases to list all domains configured to use a specific nameserver host, helping you trace websites hosted on the same infrastructure.
Reverse NS checks help you research competitor networks, find related websites under the same hosting setup, audit nameserver health, and identify shared hosting footprints.
Yes, the tool automatically retrieves the authoritative nameservers for the domain first, then runs the reverse lookup on those servers.
WHOIS databases update at varying intervals, and privacy protections or private nameserver setups can mask some associated domains.
Keep going
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Retrieve ownership and registration details for multiple domains.
About the Reverse NS Checker
Mapping the digital footprint of online networks often starts at the nameserver level. This utility helps you track down domains registered under matching nameserver hosts, making it easier to analyze portfolio structures and competitor networks.
Benefits
- Map domain networks — Discover related sites sharing nameserver hosts with a competitor.
- Analyze host clients — See how many websites trust a particular DNS hosting provider or reseller.
- Audit private setups — Check if your private nameservers are correctly routing only your target domains.
- Identify DNS footprints — Identify shared infrastructure footprints during security audits.
Privacy
Queries are processed using public registry nodes and no search data is logged.