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.

17 hosts · 369 ms

HostCertsFirst seenLast seenDNS
fridayplans.com 6 2025-10-20 2026-09-22 ok
*.fridayplans.com 6 2025-10-20 2026-09-22 —
intake2.fridayplans.com 6 2026-06-02 2026-10-01 ok
grafana.fridayplans.com 4 2026-06-06 2026-10-05 ok
intake.fridayplans.com 2 2025-07-08 2026-06-08 ok
traefik.fridayplans.com 5 2026-05-16 2026-09-13 ok
clk.fridayplans.com 1 2026-01-12 2026-01-12 ok
pma-qm.fridayplans.com 5 2026-05-16 2026-09-13 ok
origin.fridayplans.com 6 2026-05-03 2026-08-30 ok
provider.fridayplans.com 5 2026-05-16 2026-09-13 ok
lander.fridayplans.com 1 2025-11-23 2025-11-23 ok
cs.fridayplans.com 5 2026-05-16 2026-09-13 ok
members.fridayplans.com 5 2026-05-16 2026-09-13 ok
swarmpit.fridayplans.com 5 2026-05-24 2026-09-21 ok
support.fridayplans.com 5 2026-04-22 2026-08-20 ok
v.fridayplans.com 2 2025-10-23 2026-09-23 ok
survey.fridayplans.com 5 2026-05-16 2026-09-13 ok

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