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 · 318 ms

HostCertsFirst seenLast seenDNS
loops.so 66 2025-11-10 2026-10-04 ok
*.loops.so 17 2025-11-10 2026-10-04 —
smtp-2.loops.so 5 2026-04-27 2026-08-25 ok
smtp.loops.so 5 2026-04-27 2026-08-25 ok
status.loops.so 5 2026-05-12 2026-09-08 ok
www.loops.so 20 2026-04-18 2026-09-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/loops.so (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/loops.so.