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 · 343 ms

HostCertsFirst seenLast seenDNS
fidelity.com.au 44 2026-01-20 2026-10-06 ok
page.marketing.fidelity.com.au 16 2026-05-13 2026-09-08 ok
email.marketing.fidelity.com.au 10 2026-05-03 2026-08-29 ok
institutional.fidelity.com.au 5 2026-06-01 2026-09-29 ok
vpn.fidelity.com.au 2 2025-08-14 2026-08-12 ok
page.ws.fidelity.com.au 10 2026-05-07 2026-09-02 ok
email.ws.fidelity.com.au 10 2026-05-08 2026-09-03 ok
www.fidelity.com.au 44 2026-01-20 2026-10-06 ok

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