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.

10 hosts · 378 ms

HostCertsFirst seenLast seenDNS
mayfran.com 11 2026-02-10 2026-09-17 ok
*.mayfran.com 1 2026-02-10 2026-02-10 —
brand.mayfran.com 5 2026-05-05 2026-09-02 ok
www.brand.mayfran.com 5 2026-05-05 2026-09-02 ok
vpn.mayfran.com 1 2026-02-12 2026-02-12 ok
www.vpn.mayfran.com 1 2026-02-12 2026-02-12 nxdomain
mivpn.mayfran.com 1 2026-02-12 2026-02-12 ok
www.mivpn.mayfran.com 1 2026-02-12 2026-02-12 nxdomain
hsinfo.mayfran.com 10 2026-05-05 2026-08-31 ok
www.mayfran.com 10 2026-05-11 2026-09-17 ok

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