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 · 317 ms

HostCertsFirst seenLast seenDNS
contactpigeon.com 34 2026-04-14 2026-10-01 ok
*.contactpigeon.com 33 2026-04-14 2026-10-01 —
alpha.contactpigeon.com 15 2026-04-12 2026-09-09 ok
blog.contactpigeon.com 11 2026-06-03 2026-10-02 ok
fresh.contactpigeon.com 22 2026-05-07 2026-07-10 ok
em.contactpigeon.com 2 2026-01-23 2026-04-17 ok
*.em.contactpigeon.com 13 2026-01-23 2026-09-27 —
do.contactpigeon.com 1 2026-01-23 2026-01-23 ok
*.do.contactpigeon.com 13 2026-01-23 2026-09-26 —
cdp.contactpigeon.com 4 2026-06-02 2026-10-02 ok
teams.contactpigeon.com 2 2026-07-10 2026-07-10 ok
cpteams.contactpigeon.com 9 2026-07-10 2026-09-09 ok
careers.contactpigeon.com 8 2026-04-14 2026-06-13 ok
partners.contactpigeon.com 1 2026-05-21 2026-05-21 nodata
support.contactpigeon.com 5 2026-04-28 2026-08-25 ok
shout.contactpigeon.com 11 2026-04-15 2026-08-11 ok
*.shout.contactpigeon.com 23 2026-04-15 2026-09-24 —
snappieu.contactpigeon.com 1 2026-04-17 2026-04-17 ok
cpdev.contactpigeon.com 4 2026-06-05 2026-10-05 ok

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