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 · 278 ms

HostCertsFirst seenLast seenDNS
mainelobsternow.com 28 2026-04-16 2026-09-27 ok
*.mainelobsternow.com 12 2026-05-15 2026-09-10 —
tracking.mainelobsternow.com 20 2026-05-28 2026-09-23 ok
returns.mainelobsternow.com 18 2026-05-28 2026-09-23 ok
account.mainelobsternow.com 5 2026-04-22 2026-08-20 ok
www.mainelobsternow.com 17 2026-04-08 2026-09-19 ok

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