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 · 307 ms

HostCertsFirst seenLast seenDNS
mtabt.org 14 2025-09-18 2026-10-01 ok
*.mtabt.org 14 2025-09-18 2026-10-01 —
ISDSECOPS.mtabt.org 2 2025-09-18 2025-09-18 —
autodiscover.mtabt.org 1 2025-08-12 2025-08-12 ok
btrilprserver.mtabt.org 2 2025-09-18 2025-09-18 nxdomain
btvnlprserver.mtabt.org 2 2025-09-18 2025-09-18 nxdomain
isdservicerequest.mtabt.org 2 2025-09-18 2025-09-18 nxdomain
www.mtabt.org 5 2026-06-11 2026-09-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mtabt.org (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/mtabt.org.