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.

5 hosts · 158 ms

HostCertsFirst seenLast seen
abbexa.com 25 2026-04-14 2026-10-09
*.abbexa.com 25 2026-04-14 2026-10-09
docs.abbexa.com 3 2026-06-03 2026-08-03
mta-sts.abbexa.com 4 2026-05-03 2026-07-03
dev.abbexa.com 1 2026-04-14 2026-04-14

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