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.

20 hosts · 351 ms

HostCertsFirst seenLast seenDNS
govplus.com 57 2026-02-21 2026-10-02 ok
*.govplus.com 28 2025-09-10 2026-09-24 —
2b5bjk.dashboard.govplus.com 3 2026-05-15 2026-09-01 ok
billing.govplus.com 10 2026-05-30 2026-09-25 ok
i.govplus.com 3 2026-05-27 2026-09-10 ok
retool.govplus.com 7 2026-05-20 2026-09-17 ok
travelpro.govplus.com 8 2026-04-14 2026-08-10 ok
premier-passports.govplus.com 4 2026-08-21 2026-08-21 ok
*.premier-passports.govplus.com 4 2026-08-21 2026-08-21 —
mta-sts.govplus.com 4 2026-04-19 2026-08-17 ok
status.govplus.com 5 2026-05-08 2026-09-04 ok
premier-passport.govplus.com 4 2026-08-21 2026-08-21 ok
*.premier-passport.govplus.com 4 2026-08-21 2026-08-21 —
trust.govplus.com 2 2026-08-31 2026-08-31 —
www.govplus.com 15 2026-06-03 2026-09-29 ok
apply.govplus.com 6 2026-07-11 2026-09-08 ok
staging-apply.govplus.com 6 2026-07-25 2026-09-22 ok
*.staging-apply.govplus.com 6 2026-07-25 2026-09-22 —
*.apply.govplus.com 6 2026-07-11 2026-09-08 —
z.govplus.com 12 2026-05-10 2026-09-06 ok

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