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.

3 hosts · 317 ms

HostCertsFirst seenLast seenDNS
img.protabo.info 6 2026-04-19 2026-08-15 ok
bimi.protabo.info 5 2026-04-17 2026-09-30 ok
r.protabo.info 4 2026-05-10 2026-07-29 ok

Programmatic access, with DNS A records: API GET /v1/hosts/protabo.info (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/protabo.info.