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 · 304 ms

HostCertsFirst seenLast seenDNS
mayfran.eu 6 2026-05-11 2026-09-14 ok
*.mayfran.eu 1 2026-05-11 2026-05-11 —
filecap.mayfran.eu 4 2026-06-06 2026-10-05 ok
pwmanager.mayfran.eu 3 2026-05-08 2026-08-27 ok
dev.mayfran.eu 5 2026-05-17 2026-09-14 ok
www.mayfran.eu 5 2026-05-29 2026-09-25 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mayfran.eu (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/mayfran.eu.