Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

11 hosts · 250 ms

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HostCertsFirst seenLast seen
tpnmail.co.uk 2 2026-07-29 2026-09-28
*.tpnmail.co.uk 2 2025-08-13 2026-07-14
backoffice.tpnmail.co.uk 2 2026-07-30 2026-09-28
live.tpnmail.co.uk 1 2026-08-31 2026-08-31
lyncdiscoverinternal.tpnmail.co.uk 1 2026-09-01 2026-09-01
signin.tpnmail.co.uk 2 2026-07-30 2026-09-28
claims.tpnmail.co.uk 2 2026-08-04 2026-10-03
accounts.tpnmail.co.uk 2 2026-07-24 2026-09-22
support.tpnmail.co.uk 1 2026-08-28 2026-08-28
www.tpnmail.co.uk 2 2026-07-29 2026-09-28
my.tpnmail.co.uk 2 2026-07-31 2026-09-29

Programmatic access: API GET /v1/hosts/tpnmail.co.uk (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/tpnmail.co.uk.