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.

8 hosts · 324 ms

HostCertsFirst seenLast seenDNS
rugs.com 5 2025-07-15 2026-08-21 ok
*.rugs.com 2 2025-07-15 2026-06-15 —
link.mail.rugs.com 2 2025-07-14 2026-06-13 ok
images.rugs.com 2 2025-09-03 2026-08-21 ok
sms.rugs.com 14 2026-04-30 2026-08-26 ok
scripts.rugs.com 8 2026-06-26 2026-10-04 ok
sv.rugs.com 6 2026-03-30 2026-09-14 ok
www.rugs.com 1 2026-02-13 2026-02-13 ok

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