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.

31 hosts · 295 ms

HostCertsFirst seenLast seenDNS
matterhackers.com 8 2025-07-15 2026-08-13 ok
auth-prod.matterhackers.com 9 2026-04-25 2026-10-05 ok
dfs-prod.matterhackers.com 11 2026-04-13 2026-09-22 ok
ofs-prod.matterhackers.com 14 2026-05-26 2026-09-10 ok
pls-prod.matterhackers.com 7 2026-05-28 2026-09-14 ok
teams-prod.matterhackers.com 9 2026-05-19 2026-09-03 ok
cms-prod.matterhackers.com 13 2026-05-31 2026-09-18 ok
vos-prod.matterhackers.com 17 2026-05-25 2026-09-12 ok
img.matterhackers.com 14 2026-04-27 2026-10-05 ok
mil.matterhackers.com 11 2026-05-25 2026-09-20 ok
team.matterhackers.com 9 2026-05-22 2026-09-08 ok
forum.matterhackers.com 5 2026-04-11 2026-09-22 ok
help.matterhackers.com 5 2026-05-03 2026-08-31 ok
services.matterhackers.com 11 2026-05-26 2026-09-22 ok
forums.matterhackers.com 4 2025-12-21 2026-07-06 ok
www.forums.matterhackers.com 1 2025-12-21 2025-12-21 nxdomain
iss.matterhackers.com 14 2026-04-26 2026-10-05 ok
accounts.matterhackers.com 13 2025-12-15 2026-09-01 ok
www.accounts.matterhackers.com 1 2025-12-15 2025-12-15 nxdomain
fast.matterhackers.com 3 2026-05-17 2026-08-30 ok
img-test.matterhackers.com 17 2026-04-25 2026-09-01 ok
dfs-test.matterhackers.com 5 2026-04-14 2026-09-20 ok
ofs-test.matterhackers.com 18 2026-05-28 2026-09-14 ok
pls-test.matterhackers.com 4 2026-05-23 2026-09-09 ok
cms-test.matterhackers.com 20 2026-04-09 2026-09-23 ok
vos-test.matterhackers.com 18 2026-05-30 2026-09-19 ok
iss-test.matterhackers.com 17 2026-04-28 2026-09-01 ok
www.matterhackers.com 8 2025-07-15 2026-09-21 ok
venturebox.matterhackers.com 14 2026-04-16 2026-09-28 ok
pay.matterhackers.com 2 2026-04-24 2026-06-23 ok
www.pay.matterhackers.com 2 2026-04-24 2026-06-23 nxdomain

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