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.

2 hosts · 4361 ms

HostCertsFirst seenLast seen
*.mail.ica.se 1 2025-11-17 2025-11-17
tracking.ib38970.mail.ica.se 5 2026-06-04 2026-09-29

Programmatic access: API GET /v1/hosts/mail.ica.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/mail.ica.se.