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.

20 hosts · 331 ms

HostCertsFirst seenLast seenDNS
altitude-sports.com 61 2026-04-12 2026-09-23 ok
*.altitude-sports.com 16 2026-05-23 2026-09-18 —
kinsta.altitude-sports.com 8 2026-05-17 2026-09-12 ok
*.kinsta.altitude-sports.com 8 2026-05-17 2026-09-12 —
id.altitude-sports.com 5 2026-05-14 2026-09-16 ok
clerk.id.altitude-sports.com 10 2026-05-15 2026-09-11 ok
accounts.id.altitude-sports.com 8 2026-05-15 2026-09-11 ok
maintenance.altitude-sports.com 6 2026-05-07 2026-09-02 nxdomain
returns-staging.altitude-sports.com 5 2026-05-29 2026-09-30 ok
blog.altitude-sports.com 8 2026-05-26 2026-09-21 ok
search.altitude-sports.com 10 2026-04-12 2026-08-08 ok
bimi.altitude-sports.com 8 2026-04-20 2026-08-16 ok
whcmij.altitude-sports.com 4 2026-05-23 2026-10-01 ok
odin.altitude-sports.com 5 2026-05-08 2026-09-05 ok
returns.altitude-sports.com 5 2026-05-29 2026-10-01 ok
careers.altitude-sports.com 10 2026-05-21 2026-09-18 ok
reviews.altitude-sports.com 10 2026-05-28 2026-09-23 ok
content.altitude-sports.com 6 2026-05-27 2026-09-22 ok
*.preview.altitude-sports.com 5 2026-05-14 2026-09-15 —
www.altitude-sports.com 5 2026-05-15 2026-09-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/altitude-sports.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/altitude-sports.com.