Find every subdomain
of a domain.

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

18 hosts · 358 ms

HostCertsFirst seenLast seenDNS
comfrt.com 23 2026-05-31 2026-09-28 ok
*.comfrt.com 15 2026-05-31 2026-09-26 —
test-nostra.comfrt.com 11 2026-05-11 2026-09-08 ok
okta.comfrt.com 6 2026-06-22 2026-09-23 ok
creator-hub.comfrt.com 4 2026-05-26 2026-07-25 ok
tracking.creatorhub.comfrt.com 1 2026-05-13 2026-05-13 ok
trk.send.comfrt.com 10 2026-04-25 2026-08-22 ok
stage.comfrt.com 5 2026-05-13 2026-09-09 ok
i.comfrt.com 6 2026-04-13 2026-09-18 ok
storybook.comfrt.com 4 2026-04-13 2026-08-16 ok
bynder.comfrt.com 2 2025-08-25 2026-07-26 ok
api.dev.wellns.comfrt.com 5 2026-08-12 2026-08-13 ok
api.kyleshaw.wellns.comfrt.com 2 2026-08-12 2026-08-12 ok
account.comfrt.com 5 2026-05-19 2026-09-16 ok
www.comfrt.com 22 2026-04-13 2026-09-28 ok
*.www.comfrt.com 7 2026-04-13 2026-09-23 —
try.comfrt.com 6 2026-06-12 2026-08-10 ok
fbebz.comfrt.com 11 2026-05-26 2026-09-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/comfrt.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/comfrt.com.