Associated Domains
Discover a domain's infrastructure — nameservers, MX hosts, and providers.
GET
/v1/associated
curl "https://dns.toolkitapi.io/v1/associated?domain=github.com"
import httpx
resp = httpx.get(
"https://dns.toolkitapi.io/v1/associated?domain=github.com",
)
print(resp.json())const resp = await fetch("https://dns.toolkitapi.io/v1/associated?domain=github.com", {
});
const data = await resp.json();
console.log(data);# See curl example
Response
200 OK
{
"domain": "github.com",
"nameservers": ["dns1.p08.nsone.net", "dns2.p08.nsone.net"],
"mx_hosts": ["aspmx.l.google.com"],
"a_records": ["140.82.121.3"],
"reverse_dns": ["lb-140-82-121-3-iad.github.com"],
"ns_providers": ["NS1"],
"mx_providers": ["Google"],
"query_time_ms": 156.3
}Try It Live
Live Demo
Response
Description
Discover a domain's infrastructure — nameservers, MX hosts, and providers.
How to Use
1
1. Pass the domain in the `domain` parameter. 2. Review `ns_providers` and `mx_providers` to identify hosting and email providers.
About This Tool
Associated Domains discovers a domain's infrastructure relationships: authoritative nameservers, MX hosts, A records, reverse DNS hostnames, and the provider organizations behind the NS and MX servers. It maps the ecosystem around a domain.
Why Use This Tool
- Infrastructure mapping — Identify DNS, email, and hosting providers for any domain
- Competitive intelligence — See what services competitors use
- Vendor identification — Determine a company's technology stack from DNS
- Incident response — Quickly map a domain's infrastructure during investigations
Frequently Asked Questions
How are providers identified?
Provider names are derived from the nameserver and MX hostnames — e.g., `dns1.p08.nsone.net` maps to NS1.
Does this discover sibling domains?
Not directly — it maps infrastructure relationships. Use reverse DNS and NS provider info to find related domains manually.
Start using Associated Domains now
Get your free API key and make your first request in under a minute.