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.

10 hosts · 238 ms

HostCertsFirst seenLast seenDNS
georgiaboot.com 16 2026-05-19 2026-09-29 ok
dmdtb.georgiaboot.com 8 2026-05-26 2026-09-21 ok
send.georgiaboot.com 8 2026-04-25 2026-06-24 nxdomain
manage.georgiaboot.com 9 2026-04-23 2026-06-21 nxdomain
wnacug.georgiaboot.com 3 2026-05-12 2026-10-01 ok
i.georgiaboot.com 3 2026-07-09 2026-09-07 ok
sgtm.georgiaboot.com 3 2026-05-20 2026-09-04 ok
metrics.georgiaboot.com 5 2026-04-24 2026-10-03 ok
pages.georgiaboot.com 7 2026-04-25 2026-06-23 nxdomain
www.georgiaboot.com 18 2026-05-19 2026-09-30 ok

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