.biz
Availability-check reliability and the registry servers we query for .biz domains.
Our answer rate
Good Generic- Answer rate
- 99.8% of attempted checks returned a definitive answer
- Check volume
- Medium (coarse band, not a count)
- Mostly answered by
- DNS
- Still available
- 95.5% of answered .biz candidates were unregistered
- Last definitive answer
- 2026-09-21
Servers we query for .biz
Public registry infrastructure — a whois, a
dig NS biz, and one read of
IANA’s bootstrap file
return the same three values. Listed here for convenience.
- WHOIS host
-
whois.nic.biz - Authoritative nameservers
-
b.gtld.biz156.154.125.65c.gtld.biz156.154.127.65m.gtld.biz204.74.105.1n.gtld.biz204.74.107.1w.gtld.biz37.209.192.13x.gtld.biz37.209.194.13y.gtld.biz37.209.196.13a.gtld.biz156.154.124.65 - RDAP endpoint
-
https://rdap.nic.biz/
What this measures: the share of our own availability checks that came back with a definitive answer. Nobody else publishes this, because nobody else is running bulk registry lookups at this scale and recording what came back.
What it does not measure: a registry’s uptime or quality. A low rate here can just as easily mean our requests are being rate-limited as it can mean anything about the registry itself.
These are current-state figures, not a history. We keep one record per domain, holding its most recent check — so a TLD that failed hundreds of times and then recovered reads as healthy here. A low rate means checks are failing now; a high one does not mean they always have.
Figures count domains checked, not queries — a domain checked six times counts once. Candidates we generated but never checked are excluded entirely; they are not failures. Snapshot rebuilt 2026-09-27 02:19:47.