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Reverse NS

Find domains sharing the same name server.

Reverse NS

Find domains sharing the same name server.

Enter name server, domain name, IP address (IPv4 and IPv6) or subnet. Example: dnslytics.com or ns1.google.com

Handle input as domain name instead of NS record

We first check your input against our list of known name servers (NS records). If we do not find any name servers matching your input we will treat your input as a domain name and perform a live NS lookup.

Tool description

Every domain name has one or more name servers (NS record). Use the Reverse NS tool to find domains sharing the same name server. It shows a maximum of 2,500 connected domains (depending on your membership type). For subnets it shows a maximum of 255 IP addresses. Just type a name server, domain name, IP address or subnet and click the Go button. Both IPv4 and IPv6 addresses are supported. For the subnet view you have to type the subnet in the form of x.x.x for IPv4 subnets and x:x:x:x for IPv6 subnets.

Example objectives

  • Discover relations like ownership between domain names.
  • Monitor and discover name servers on the same subnet.
  • Perform research on malicious name servers.
  • Monitor new and removed domains on name servers of competitors.


Q: How do you decide a name server is hosted on an IP address?
A: First we identify a name server when it is actually configured in the DNS for a domain. For example if ns1.domain.com is a NS record for domain.com, we identify ns1.domain.com as a name server. After we identify a name server we perform an A and AAAA lookup of the name server.

Q: How often do you resolve the NS records for a domain?
A: Our DNS crawlers try to resolve every domain name once per month.

Q: How many name servers do you have?
A: We have 5+ million active name servers on file.

Q: How many domains do you have?
A: We have access to all gTLD (ex com, net, org) and nTLD (ex xyz, berlin, nyc) daily zone files. For ccTLD (ex de, fr, eu) our coverage is between 40% and 70% depending on the ccTLD.

Q: Is this tool available for all Top Level Domains?
A: Yes, the Reverse NS tool returns all domains.

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