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.

19 hosts · 344 ms

HostCertsFirst seenLast seenDNS
roomandboard.com 4 2025-08-06 2026-08-06 ok
*.roomandboard.com 4 2025-08-06 2026-08-06 —
staging.roomandboard.com 8 2026-04-27 2026-08-23 ok
colostaging.roomandboard.com 2 2026-08-19 2026-08-19 ok
azstaging.roomandboard.com 4 2026-06-23 2026-08-21 ok
*.rfk.roomandboard.com 3 2025-11-04 2026-10-04 —
initjs.rfk.roomandboard.com 1 2026-02-02 2026-02-02 ok
go.roomandboard.com 7 2025-10-19 2026-09-19 ok
signaturegenerator.roomandboard.com 2 2026-09-14 2026-09-14 ok
smetrics.roomandboard.com 2 2025-11-09 2025-11-09 ok
appointments.roomandboard.com 1 2026-01-22 2026-01-22 ok
staging-appointments.roomandboard.com 1 2025-12-18 2025-12-18 ok
cloud.news.roomandboard.com 1 2026-06-15 2026-06-15 ok
image.news.roomandboard.com 4 2025-09-29 2026-08-31 ok
click.news.roomandboard.com 3 2025-09-04 2026-08-24 ok
pages.news.roomandboard.com 4 2025-11-05 2026-08-28 ok
view.news.roomandboard.com 3 2025-09-04 2026-08-24 ok
www.roomandboard.com 7 2026-05-18 2026-09-13 ok
azwww.roomandboard.com 6 2026-06-30 2026-08-28 ok

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