Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

16 hosts · 314 ms

HostCertsFirst seenLast seen
fire.org 7 2026-04-28 2026-10-11
linkpage.fire.org 8 2026-05-19 2026-05-21
myfire.fire.org 6 2026-04-28 2026-09-18
wiki.fire.org 6 2026-04-28 2026-09-18
expression.fire.org 11 2026-06-01 2026-09-27
learn.fire.org 10 2026-05-08 2026-09-03
go.fire.org 9 2026-04-20 2026-09-17
camp.fire.org 16 2026-04-19 2026-10-14
shop.fire.org 14 2026-04-20 2026-08-18
qr.fire.org 5 2026-05-19 2026-05-21
rankings.fire.org 7 2026-06-13 2026-10-11
studentpress.fire.org 6 2026-04-28 2026-09-18
itsupport.fire.org 4 2026-06-13 2026-10-11
www.fire.org 7 2026-04-28 2026-10-11
soapbox.fire.org 8 2026-05-09 2026-10-10
www.soapbox.fire.org 7 2026-05-06 2026-09-16

Programmatic access: API GET /v1/hosts/fire.org (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/fire.org.