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.

10 hosts · 190 ms

HostCertsFirst seenLast seen
phonehero.se 8 2026-05-31 2026-09-26
*.phonehero.se 5 2026-05-31 2026-09-26
email.mg.phonehero.se 4 2026-06-12 2026-10-10
testing.phonehero.se 5 2026-04-26 2026-09-13
mailcoach.phonehero.se 5 2026-04-28 2026-09-15
www.mailcoach.phonehero.se 5 2026-04-28 2026-09-15
retail.phonehero.se 1 2026-09-16 2026-09-16
www.retail.phonehero.se 1 2026-09-16 2026-09-16
metrics.phonehero.se 4 2026-04-29 2026-10-10
www.phonehero.se 3 2026-06-12 2026-08-21

Programmatic access: API GET /v1/hosts/phonehero.se (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/phonehero.se.