domain-availability-checker.underscoredone.com

As advertised

Read from a directory and written down with its source and date. Not measured. provenance: recorded

url

https://domain-availability-checker.underscoredone.com/check

hostname

domain-availability-checker.underscoredone.com

operator

Domain Availability Checker

capability

Give this API up to 10 domain names and it tells you whether each has a registration record at the official registry. It uses RDAP, the structured replacement for WHOIS, so there is no free-text parsing. Each domain comes back as 'registered', 'unregistered', or 'indeterminate' when the registry has no RDAP for that ending. 'Unregistered' means no record was found, which usually means available - but reserved and premium names also return no record. Registration status only; no pricing.

capability tag

domain-dns

source directory

cdp-bazaar

Seen

first seen

4 September 2026 2026-09-04T11:24:51Z

last seen

4 September 2026 2026-09-04T11:24:51Z

current status

active

observations

1

observation cost, USD

$0.00

Price history

1 rows. 0 observed on a call Crosspeel made, 1 recorded from an advertised figure. The provenance column says which, on every row, and the two are never added together.

Cluster membership

This endpoint is not a member of any published cluster. That means either no match was found at the current threshold, or the observations behind a candidate match do not yet reach the depth the method requires. Neither is a statement about the endpoint. The thresholds are at /method.

Observations