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.

23 hosts · 309 ms

HostCertsFirst seenLast seen
firi.com 135 2025-12-19 2026-10-10
*.firi.com 22 2025-12-19 2026-10-10
beta.firi.com 18 2026-06-13 2026-10-09
support-sam-beta.firi.com 10 2026-06-13 2026-10-09
corporate.firi.com 2 2026-09-10 2026-09-10
*.corporate.firi.com 2 2026-09-10 2026-09-10
testing.firi.com 1 2026-05-15 2026-05-15
onelink.firi.com 17 2026-06-11 2026-10-07
storybook.firi.com 18 2026-05-24 2026-09-26
app-storybook.firi.com 16 2026-05-31 2026-09-26
support-sam.firi.com 6 2026-05-08 2026-09-03
platform.firi.com 6 2026-05-08 2026-09-03
frodo.firi.com 16 2026-05-15 2026-09-10
cato.firi.com 4 2026-06-10 2026-06-10
proto.firi.com 3 2026-07-08 2026-09-06
julekalender.firi.com 4 2026-04-23 2026-07-02
investorupdates.firi.com 18 2026-06-11 2026-10-08
www.investorupdates.firi.com 19 2026-06-11 2026-10-08
at.firi.com 4 2026-05-25 2026-07-24
main-cfbucket.firi.com 10 2026-04-29 2026-08-26
support.firi.com 8 2026-04-20 2026-08-16
platform-new.firi.com 10 2026-06-08 2026-10-04
tracking-library.firi.com 11 2026-05-24 2026-09-19

Programmatic access: API GET /v1/hosts/firi.com (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/firi.com.