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.

12 hosts · 340 ms

HostCertsFirst seenLast seenDNS
financialprofessionals.org 17 2026-04-24 2026-09-20 ok
*.financialprofessionals.org 17 2026-04-24 2026-09-20 —
engage.financialprofessionals.org 10 2026-04-29 2026-10-01 ok
login-stage.financialprofessionals.org 4 2026-08-06 2026-10-04 ok
collaborate.financialprofessionals.org 12 2026-06-05 2026-09-29 ok
login.financialprofessionals.org 10 2026-05-04 2026-08-31 ok
learn.financialprofessionals.org 19 2026-05-04 2026-09-21 ok
help.financialprofessionals.org 14 2026-04-15 2026-08-11 ok
resources.financialprofessionals.org 10 2026-04-15 2026-08-12 ok
blogs.financialprofessionals.org 14 2026-04-15 2026-08-11 ok
mta-sts.financialprofessionals.org 2 2026-06-01 2026-08-12 ok
login-test.financialprofessionals.org 4 2026-08-06 2026-10-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/financialprofessionals.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/financialprofessionals.org.