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 · 272 ms

HostCertsFirst seenLast seenDNS
coastalcloud.us 30 2026-04-19 2026-09-16 ok
*.coastalcloud.us 16 2026-04-19 2026-09-16 —
media.coastalcloud.us 5 2026-05-08 2026-09-15 ok
lighthouse.coastalcloud.us 18 2026-05-15 2026-09-11 ok
wiki.coastalcloud.us 6 2026-04-17 2026-09-30 ok
go.coastalcloud.us 9 2026-04-19 2026-09-15 ok
tableaudemo.coastalcloud.us 7 2026-05-18 2026-08-13 ok
nautilusextractor.coastalcloud.us 4 2026-04-19 2026-08-17 ok
services.coastalcloud.us 18 2026-05-15 2026-09-10 ok
projects.coastalcloud.us 20 2026-05-15 2026-09-11 ok
clients.coastalcloud.us 3 2026-06-07 2026-08-12 ok
www.coastalcloud.us 12 2026-04-16 2026-08-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/coastalcloud.us (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/coastalcloud.us.