Domain Info

Look up DNS records and check availability for any domain. Returns A, AAAA, MX, NS, TXT, and CNAME records alongside a registration availability flag derived from NS delegation.

Get API Key

Overview

Use Cases

Domain availability checking before registration
Email deliverability checks (MX record presence)
Security audits and DNS reconnaissance
Monitoring DNS propagation after record changes

Features

A and AAAA (IPv4 and IPv6) record lookup

MX record lookup for mail server detection

NS record lookup with availability inference

TXT record lookup for SPF, DKIM, and verification tokens

CNAME alias detection

Availability flag — true when the domain has no NS delegation (NXDOMAIN)

API Endpoints

Get Domain Info

Returns DNS records and availability status for the given domain.

GET

https://api.requiems.xyz/v1/tech/domain/{domain}

Parameters

Name	Type	Required	Description
domain	`string`	Required	The domain to look up (e.g. example.com)

Try it out

Live Demo

Request

domain * (string)

The domain to look up (e.g. example.com)

Response Fields

Field	Type	Description
domain	`string`	The domain that was looked up
available	`boolean`	True when the domain appears to be unregistered (NS lookup returns NXDOMAIN). False when name servers are delegated.
dns.a	`array of strings`	IPv4 addresses (A records)
dns.aaaa	`array of strings`	IPv6 addresses (AAAA records)
dns.mx	`array of objects`	Mail exchange records, each with host and priority fields
dns.ns	`array of strings`	Authoritative name server hostnames
dns.txt	`array of strings`	TXT record values (SPF, DKIM, verification tokens, etc.)
dns.cname	`string`	CNAME alias target, if the domain is an alias. Empty string when no alias exists.

Code Examples

curl "https://api.requiems.xyz/v1/tech/domain/example.com" \
  -H "requiems-api-key: YOUR_API_KEY"

import requests

domain = "example.com"
url = f"https://api.requiems.xyz/v1/tech/domain/{domain}"
headers = {"requiems-api-key": "YOUR_API_KEY"}

response = requests.get(url, headers=headers)
data = response.json()
print(data["data"]["available"], data["data"]["dns"]["a"])

const domain = 'example.com';
const response = await fetch(`https://api.requiems.xyz/v1/tech/domain/${domain}`, {
  headers: { 'requiems-api-key': 'YOUR_API_KEY' }
});

const data = await response.json();
console.log(data.data.available, data.data.dns.a);

require 'net/http'
require 'json'

domain = 'example.com'
uri = URI("https://api.requiems.xyz/v1/tech/domain/#{domain}")
request = Net::HTTP::Get.new(uri)
request['requiems-api-key'] = 'YOUR_API_KEY'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

data = JSON.parse(response.body)
puts data['data']['available']
puts data['data']['dns']['a'].inspect

Error Responses

bad_request

The domain parameter is not a valid hostname (e.g. missing TLD, invalid characters, or leading/trailing hyphens).

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