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.

8 hosts · 232 ms

HostCertsFirst seenLast seenDNS
giftster.com 13 2026-05-14 2026-09-13 ok
*.giftster.com 8 2026-05-16 2026-09-11 —
m.staging.giftster.com 8 2026-05-16 2026-09-11 nxdomain
email.giftster.com 5 2026-05-12 2026-09-09 ok
help.giftster.com 5 2026-05-17 2026-09-13 ok
apidocs.giftster.com 13 2026-05-22 2026-09-17 ok
status.giftster.com 5 2026-05-17 2026-09-13 ok
m.sandbox.giftster.com 8 2026-05-16 2026-09-11 nxdomain

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