Reverse NS Lookup API - Find Domains by Nameserver

Try it now - no signup required:

curl "https://domscan.net/v1/dns/reverse/ns?ns=ns1.google.com"

Example Response

{
  "nameserver": "ns1.google.com",
  "domain_count": 1250000,
  "sample_domains": [
    "google.com",
    "youtube.com",
    "blogger.com",
    "withgoogle.com",
    "google.co.uk"
  ],
  "organization": "Google LLC",
  "is_public_dns": false
}

Key Features

Domain Discovery

Find all domains hosted on a nameserver.

Infrastructure Mapping

Understand DNS hosting relationships.

Organization Detection

Identify which company operates the nameserver.

Related Domain Finding

Discover domains belonging to the same organization.

Hosting Provider Analysis

Identify domains using specific DNS providers.

Sample Domains

Get representative examples of hosted domains.

Domain Count

See total number of domains on the nameserver.

Public DNS Detection

Identify public DNS services vs. private nameservers.

Frequently Asked Questions

How do you find domains on a nameserver?

We aggregate zone file data, passive DNS observations, and domain registration data to build a comprehensive mapping of nameserver to domain relationships.

Why would I use reverse NS lookup?

Common use cases: finding all domains belonging to a company, identifying hosting relationships, discovering hidden assets, competitor analysis, and security research.

How complete is the domain list?

We provide a representative sample of domains and a total count. Full lists for popular nameservers can contain millions of domains.

Can I find domains for any nameserver?

We have data for most actively used nameservers. Very new or rarely-used nameservers may have limited data.