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.

22 hosts · 467 ms

HostCertsFirst seenLast seenDNS
mtinc.net 29 2025-08-07 2026-10-02 ok
*.mtinc.net 21 2025-08-07 2026-10-02 —
old.mtinc.net 3 2026-07-09 2026-09-08 ok
manage.mtinc.net 3 2026-05-24 2026-08-22 ok
outage.mtinc.net 3 2026-08-13 2026-08-13 ok
*.outage.mtinc.net 3 2026-08-13 2026-08-13 —
img.mtinc.net 5 2026-06-02 2026-09-30 ok
wiki.mtinc.net 5 2026-05-02 2026-08-30 ok
link.mtinc.net 2 2026-08-03 2026-10-02 ok
callcontrol.mtinc.net 5 2026-05-04 2026-09-01 ok
ip.mtinc.net 5 2026-06-02 2026-09-30 ok
ftp.mtinc.net 5 2026-05-01 2026-09-01 ok
beholder.mtinc.net 5 2026-05-17 2026-09-14 ok
air.mtinc.net 5 2026-05-02 2026-08-30 ok
email.notices.mtinc.net 3 2026-07-08 2026-08-26 ok
email.updates.mtinc.net 2 2026-07-24 2026-07-24 ok
nagios.mtinc.net 4 2026-06-01 2026-08-01 ok
it.mtinc.net 5 2026-05-02 2026-08-30 ok
dev.mtinc.net 5 2026-06-02 2026-09-30 ok
www.mtinc.net 5 2026-06-02 2026-09-30 ok
zabbix.mtinc.net 5 2026-05-24 2026-09-22 ok
relay.mtinc.net 4 2026-04-07 2026-08-07 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mtinc.net (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/mtinc.net.