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.

20 hosts · 294 ms

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HostCertsFirst seenLast seen
sovereign.org.uk 4 2026-05-12 2026-07-29
*.sovereign.org.uk 1 2025-12-16 2025-12-16
BA-SH00-IS02.sovereign.org.uk 1 2026-01-09 2026-01-09
keystone.sovereign.org.uk 1 2026-05-01 2026-05-01
www.keystone.sovereign.org.uk 1 2026-05-01 2026-05-01
api.sovereign.org.uk 2 2026-06-08 2026-06-08
qa.api.sovereign.org.uk 4 2026-06-12 2026-10-10
staging.api.sovereign.org.uk 4 2026-06-12 2026-10-10
dev.api.sovereign.org.uk 4 2026-06-12 2026-10-10
guestportal.sovereign.org.uk 2 2026-01-16 2026-01-16
hometransfer.sovereign.org.uk 3 2026-04-01 2026-09-21
jobs.sovereign.org.uk 1 2026-01-06 2026-01-06
payments.sovereign.org.uk 4 2026-02-23 2026-10-08
qapayments.sovereign.org.uk 4 2026-02-24 2026-10-08
stagingpayments.sovereign.org.uk 4 2026-02-24 2026-10-08
devpayments.sovereign.org.uk 2 2026-02-23 2026-06-15
test.sovereign.org.uk 1 2025-09-17 2025-09-17
*.test.sovereign.org.uk 3 2025-09-17 2026-09-16
www.sovereign.org.uk 4 2026-05-12 2026-07-29
my.sovereign.org.uk 4 2026-05-12 2026-07-29

Programmatic access: API GET /v1/hosts/sovereign.org.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/sovereign.org.uk.