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.

9 hosts · 326 ms

HostCertsFirst seenLast seenDNS
mso.com.au 4 2026-04-11 2026-08-09 ok
*.mso.com.au 1 2025-10-17 2025-10-17 —
website2021.mso.com.au 3 2026-05-15 2026-09-12 ok
admin-v4.mso.com.au 5 2026-05-12 2026-09-09 ok
ra.mso.com.au 3 2026-05-25 2026-08-24 ok
staging.mso.com.au 4 2026-06-04 2026-10-02 ok
admin.mso.com.au 4 2026-04-11 2026-08-09 ok
mta-sts.mso.com.au 3 2026-04-26 2026-09-15 ok
www.mso.com.au 5 2025-12-06 2026-08-09 ok

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