Check Domain Availability Across TLDs API

What it does

Domain Availability Checker looks up a domain name across one or more TLDs and returns RDAP-based availability signals for each check.

Send a name and, optionally, a tlds list. The response includes the queried name, an optional note, a checked_at timestamp, and a results array. Each result item contains the TLD label, full domain, status, expires, registrar, investor_score, and likely_available where available.

Use Domain Availability Checker when you need to screen candidate brand names, preflight registration flows, or compare multiple extensions before sending users to a registrar. The status values let you distinguish registered domains from RDAP misses, unknowns, and names that were not checked, so your app can make a clear decision without extra parsing.

It is a good fit for signup flows, internal naming tools, portfolio checks, and domain research dashboards that need a compact availability result rather than a full WHOIS dump.

GET

Domain availability across TLDs (RDAP)

https://api.eu.apyhub.com/freejosephe/check-domain-availability-across-tlds/v1/domain/availability

QUICKSTART

GUIDE

Quickstart

Check whether a domain name is available by passing the required name query parameter.

curl -X GET "https://api.eu.apyhub.com/freejosephe/check-domain-availability-across-tlds/v1/domain/availability?name=apyhub" \
  -H "apy-token: $APY_TOKEN"

What you'll get back

Returns a JSON object with name, note, results, and checked_at fields. results is an array of domain check objects; each item may include label, domain, status, expires, registrar, investor_score, and likely_available.

{
  "name": "apyhub",
  "checked_at": "2026-10-22T05:04:04.601Z",
  "results": [
    {
      "domain": "apyhub.com",
      "domain_unicode": null,
      "tld": "com",
      "status": "registered",
      "likely_available": false,
      "label": "Registered",
      "registrar": "Porkbun LLC",
      "expires": "2028-11-17T15:51:44Z",
      "lifecycle": "active",
      "dns_hint": null,
      "investor_score": 82
    },
    {
      "domain": "apyhub.net",
      "domain_unicode": null,
      "tld": "net",
      "status": "registered",
      "likely_available": false,
      "label": "Registered",
      "registrar": "Porkbun LLC",
      "expires": "2026-11-17T15:51:42Z",
      "lifecycle": "active",
      "dns_hint": null,
      "investor_score": 71
    },
    {
      "domain": "apyhub.org",
      "domain_unicode": null,
      "tld": "org",
      "status": "not_found_in_rdap",
      "likely_available": true,
      "label": "Not found in RDAP, likely available. Confirm at a registrar.",
      "registrar": null,
      "expires": null,
      "lifecycle": null,
      "dns_hint": null,
      "investor_score": 65
    },
    {
      "domain": "apyhub.io",
      "domain_unicode": null,
      "tld": "io",
      "status": "registered_dns_only",
      "likely_available": false,
      "label": "Registered (DNS delegation; TLD has no RDAP)",
      "registrar": null,
      "expires": null,
      "lifecycle": null,
      "dns_hint": "delegated",
      "investor_score": 63
    },
    {
      "domain": "apyhub.app",
      "domain_unicode": null,
      "tld": "app",
      "status": "unknown",
      "likely_available": null,
      "label": "Unknown (RDAP rate limited (429), retry later)",
      "registrar": null,
      "expires": null,
      "lifecycle": null,
      "dns_hint": "nxdomain",
      "investor_score": 61
    }
  ],
  "note": "\"Not found in RDAP\" means the registry has no record. Reserved or premium names can still be unavailable at registrars."
}

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About this endpoint

What it does

Checks domain availability across one or more TLDs using RDAP and returns a JSON object with the queried name, an optional note, a results array, and a checked_at timestamp.

Query Parameter(s)

Attribute	Type	Mandatory	Description
name	String	Yes	Domain name label to check. Max length: 63 characters.
tlds	String	No	TLD list to check. Max length: 200 characters.

Response

Returns a JSON object with name and note string fields, a results array of objects, and a checked_at date-time string. Each item in results describes one TLD check with the domain label, domain, status, expiration info, registrar info, investor score, and a likely-available flag.

Parameter	Type	Description
name	String	Domain name that was checked.
note	String	Additional information about the response, if provided.
results	Object Array	Array of result objects for each checked TLD.
results[].label	String	Label for the checked TLD result.
results[].domain	String	Full domain that was checked.
results[].domain_unicode	String	Unicode (IDN) form of the domain when the name contains non-ASCII characters, or `null`.
results[].tld	String	The TLD this result row is for.
results[].status	ENUM	Availability/status value. Allowed values: `registered`, `registered_dns_only`, `not_found_in_rdap`, `unknown`, `not_checked`.
results[].expires	String	Expiration value, or `null`.
results[].registrar	String	Registrar value, or `null`.
results[].lifecycle	String	Domain lifecycle state (e.g. `active`), or `null`.
results[].dns_hint	String	DNS-based hint used when RDAP data isn't available for the TLD, or `null`.
results[].investor_score	Integer	Investor score returned for the result.
results[].likely_available	Boolean	Availability hint, or `null`.
checked_at	String	Timestamp for when the check was performed, in date-time format.

▣ COMMON ERRORS

Errors any endpoint can return

400bad_request

Required parameter missing or malformed body.

401unauthorized

API key missing, revoked, or not authorized for this service.

429rate_limited

Your plan's per-second rate exceeded. Retry with exponential backoff.

503upstream_busy

Backend temporarily unavailable. Try again in a few seconds.

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From the blog

Reads that touch this API.

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