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.

6 hosts · 262 ms

HostCertsFirst seenLast seenDNS
excedo.se 23 2026-01-15 2026-10-02 ok
*.excedo.se 18 2026-01-15 2026-10-02 —
staging.excedo.se 5 2026-05-16 2026-09-13 ok
img.mail.excedo.se 11 2026-06-02 2026-09-28 ok
r.mail.excedo.se 3 2026-06-07 2026-08-26 ok
www.excedo.se 7 2026-05-22 2026-06-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/excedo.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/excedo.se.