Domain Availability API

Authentication

Create an API key from your Account → Subscription tab. Include it in the Authorization header:

Authorization: Bearer nml_your_api_key_here

Rate limit: 1,000 requests/day per key. Max 5 keys per account.

POST /api/domains/check

Check a single domain name across multiple TLDs.

Request

curl -X POST https://namilio.com/api/domains/check \
  -H "Authorization: Bearer nml_your_key" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "acmecorp",
    "tlds": [".com", ".net", ".io", ".app"]
  }'

Response

{
  "name": "acmecorp",
  "results": [
    { "domain": "acmecorp.com", "tld": ".com", "status": "taken" },
    { "domain": "acmecorp.net", "tld": ".net", "status": "available" },
    { "domain": "acmecorp.io", "tld": ".io", "status": "available" },
    { "domain": "acmecorp.app", "tld": ".app", "status": "available" }
  ],
  "checkedAt": "2026-04-13T12:00:00.000Z"
}

tlds is optional — defaults to .com, .net, .org, .app, .dev. Max 20 TLDs per request.

POST /api/domains/bulk

Check up to 50 domain names at once.

Request

curl -X POST https://namilio.com/api/domains/bulk \
  -H "Authorization: Bearer nml_your_key" \
  -H "Content-Type: application/json" \
  -d '{
    "domains": [
      { "name": "acmecorp", "tlds": [".com", ".io"] },
      { "name": "brandify" },
      { "name": "nexaflow", "tlds": [".app", ".dev"] }
    ]
  }'

Response

{
  "domains": [
    {
      "name": "acmecorp",
      "results": [
        { "domain": "acmecorp.com", "tld": ".com", "status": "taken" },
        { "domain": "acmecorp.io", "tld": ".io", "status": "available" }
      ]
    },
    {
      "name": "brandify",
      "results": [
        { "domain": "brandify.com", "tld": ".com", "status": "taken" },
        ...
      ]
    }
  ],
  "checkedAt": "2026-04-13T12:00:00.000Z"
}

Each domain can have its own tlds array (optional, defaults to popular 5). Max 50 domains, 20 TLDs each.

GET /api/domains/tlds

List all supported TLDs. No authentication required.

curl https://namilio.com/api/domains/tlds

Response

{
  "tlds": [".com", ".net", ".org", ".app", ".dev", ".tech", ".bot", ...],
  "categories": {
    "popular": [".com", ".net", ".org", ".app", ".dev"],
    "tech": [".tech", ".bot", ".io", ".ai"],
    "modern": [".xyz", ".online", ".site", ".store", ".shop", ".blog"],
    "other": [".co", ".ly", ".to", ".biz", ".inc", ".ca"]
  },
  "zoneTlds": [".com", ".net", ".org", ...],
  "note": "Zone TLDs use instant zone file lookup. Others use RDAP/DNS (slower)."
}

Domain Statuses

Errors