Domainee
Sign inGet started
Domain API · Free

Domain Availability Checker
API

Check availability of a name across one or more TLDs. Uses DNS + RDAP fallback. Returns per-TLD availability with caveats (registrar lock, premium, etc.) where known.

Read the docsTry the visual tool

Free. No API key. CORS-enabled. Rate-limited per IP.

GEThttps://api.domainee.dev/v1/tools/domain-availability-checker?name=mybrand&tlds=com

Check availability of a name across one or more TLDs. Uses DNS + RDAP fallback. Returns per-TLD availability with caveats (registrar lock, premium, etc.) where known.

Free. No API key required. CORS-enabled. Rate-limited per IP at 30/min and 500/day.

Parameters

NameInTypeDescription
namerequiredquerystring
The bare name (without TLD), e.g. `mybrand`.
example: mybrand
tldsquerystring
Optional repeatable parameter: `?tlds=com&tlds=io&tlds=dev`. Defaults to a standard SaaS set when omitted.
example: com

Example request

curl
curl -s "https://api.domainee.dev/v1/tools/domain-availability-checker?name=mybrand&tlds=com&tlds=io&tlds=dev" | jq

Example response

response.json
{
  "ok": true,
  "data": {
    "name": "mybrand",
    "results": [
      {
        "tld": "com",
        "available": false
      },
      {
        "tld": "io",
        "available": true
      },
      {
        "tld": "dev",
        "available": true
      }
    ]
  }
}

Other languages

fetch.js
const res = await fetch("https://api.domainee.dev/v1/tools/domain-availability-checker?name=mybrand&tlds=com");
const { ok, data } = await res.json();
requests.py
import requests
r = requests.get(
    "https://api.domainee.dev/v1/tools/domain-availability-checker",
    params={"name":"mybrand","tlds":"com"},
)
data = r.json()["data"]

Rate limits & errors

  • 30 requests/minute and 500 requests/day per IP. Exceeding either returns HTTP 429 with a Retry-After header.
  • All responses are JSON with the envelope { "ok": true, "data": {...} } on success or { "ok": false, "error": { "code", "message" } } on failure.
  • code values are stable; safe to switch on programmatically. message is human-friendly and may change.
Prefer a UI?

Try the domain availability checker in your browser →

No code, no curl. Type a domain, get a result.

Full reference

Documentation for /v1/tools/domain-availability-checker →

All parameters, error codes, edge cases.

Need more than free?

Domainee's full platform: Custom Domains API, MCP for AI agents, Buy-a-Domain API, and 50 customer domains free forever. The same engineering team that built these free APIs.

Start freeAll free APIs