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.

13 hosts · 270 ms

HostCertsFirst seenLast seen
konfir.com 7 2026-05-03 2026-08-31
api.konfir.com 2 2025-12-10 2026-06-10
beta.api.konfir.com 1 2026-06-10 2026-06-10
design.konfir.com 4 2026-04-17 2026-08-19
help.konfir.com 7 2026-05-30 2026-09-25
mp.konfir.com 3 2026-05-03 2026-10-03
app.konfir.com 6 2026-04-23 2026-08-27
beta.app.konfir.com 4 2026-06-10 2026-08-20
docs.konfir.com 9 2026-05-30 2026-09-26
www.employers.konfir.com 8 2026-04-22 2026-08-18
status.konfir.com 4 2026-04-21 2026-08-20
support.konfir.com 8 2026-05-26 2026-09-21
www.konfir.com 10 2026-06-13 2026-10-10

Programmatic access: API GET /v1/hosts/konfir.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/konfir.com.