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.

16 hosts · 343 ms

HostCertsFirst seenLast seenDNS
petsbest.com 7 2025-10-21 2026-09-24 ok
qa.petsbest.com 7 2025-10-06 2026-09-24 ok
api.qa.petsbest.com 6 2025-10-06 2026-09-24 ok
images.qa.petsbest.com 5 2025-10-06 2026-09-24 ok
sales.qa.petsbest.com 3 2025-10-06 2026-09-24 nxdomain
petnet.qa.petsbest.com 3 2025-10-06 2026-09-24 nxdomain
www.qa.petsbest.com 2 2026-09-24 2026-09-24 nxdomain
share.petsbest.com 5 2026-05-24 2026-09-19 ok
stg.petsbest.com 3 2025-10-06 2026-09-24 nxdomain
oauth.petsbest.com 8 2026-04-16 2026-08-14 ok
api.petsbest.com 6 2025-10-21 2026-09-24 ok
autodiscover.petsbest.com 1 2026-02-23 2026-02-23 ok
imageserver.petsbest.com 4 2026-05-01 2026-10-01 ok
images.petsbest.com 7 2025-10-21 2026-09-24 ok
farmers.petsbest.com 3 2025-10-21 2026-07-19 ok
www.petsbest.com 9 2025-10-21 2026-09-24 ok

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