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.

13 hosts · 304 ms

HostCertsFirst seenLast seenDNS
teco.com.au 3 2026-05-29 2026-08-13 ok
remote.teco.com.au 2 2025-10-19 2026-02-15 ok
www.remote.teco.com.au 2 2025-10-19 2026-02-15 nxdomain
mta-sts.email.teco.com.au 4 2026-06-05 2026-10-05 ok
appliances.teco.com.au 3 2026-05-29 2026-08-13 ok
www.appliances.teco.com.au 3 2026-05-29 2026-08-13 ok
comms.teco.com.au 4 2026-04-15 2026-08-13 ok
electricmotors.teco.com.au 3 2026-05-29 2026-08-13 ok
www.electricmotors.teco.com.au 3 2026-05-29 2026-08-13 ok
mta-sts.teco.com.au 4 2026-04-29 2026-07-23 ok
www.teco.com.au 3 2026-05-29 2026-08-13 ok
energy.teco.com.au 3 2026-05-29 2026-08-13 ok
www.energy.teco.com.au 3 2026-05-29 2026-08-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/teco.com.au (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/teco.com.au.