Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

8 hosts · 274 ms

HostCertsFirst seenLast seen
dogid.com 13 2026-05-17 2026-09-26
cdn.dogid.com 3 2026-05-14 2026-09-27
id-cdn.dogid.com 2 2026-01-18 2026-06-11
imagegen.dogid.com 4 2026-02-23 2026-10-07
help.dogid.com 8 2026-05-08 2026-09-03
blobs.dogid.com 3 2026-05-17 2026-09-30
account.dogid.com 15 2026-04-16 2026-09-29
www.dogid.com 13 2026-05-17 2026-09-29

Programmatic access: API GET /v1/hosts/dogid.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/dogid.com.