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.

12 hosts · 295 ms

HostCertsFirst seenLast seenDNS
ruffwear.com 21 2026-04-09 2026-09-23 ok
*.ruffwear.com 3 2026-04-09 2026-09-23 —
media.ruffwear.com 1 2026-01-19 2026-01-19 ok
ssc.ruffwear.com 2 2026-09-10 2026-09-10 ok
fckjf.ruffwear.com 8 2026-04-15 2026-08-12 ok
click.ruffwear.com 3 2026-09-29 2026-09-29 ok
trk.ruffwear.com 6 2026-05-02 2026-08-29 ok
shopifyconsumer.ruffwear.com 13 2026-05-16 2026-09-25 ok
returns.ruffwear.com 6 2026-05-15 2026-09-10 ok
retailers.ruffwear.com 2 2026-01-25 2026-06-22 ok
account.ruffwear.com 13 2026-04-30 2026-09-08 ok
www.ruffwear.com 16 2026-05-16 2026-09-26 ok

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