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 · 417 ms

HostCertsFirst seenLast seenDNS
heypocket.com 11 2026-04-20 2026-09-25 ok
*.heypocket.com 3 2026-02-06 2026-09-25 —
guide.heypocket.com 13 2026-05-31 2026-09-26 ok
share.heypocket.com 5 2026-05-31 2026-10-02 ok
affiliate.heypocket.com 5 2026-05-26 2026-09-23 ok
staging.heypocket.com 1 2026-04-10 2026-04-10 nxdomain
bimi.heypocket.com 2 2026-09-25 2026-09-25 ok
feedback.heypocket.com 4 2026-04-11 2026-08-09 ok
trk.email.heypocket.com 6 2026-06-09 2026-08-08 ok
app.heypocket.com 5 2026-05-29 2026-09-28 ok
www.heypocket.com 7 2026-04-19 2026-08-30 ok
community.heypocket.com 5 2026-05-30 2026-09-27 ok

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