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.

15 hosts · 320 ms

HostCertsFirst seenLast seenDNS
tjc.co.uk 18 2025-11-04 2026-09-25 ok
*.tjc.co.uk 13 2025-11-04 2026-08-31 —
i.tjc.co.uk 4 2026-05-30 2026-09-13 ok
trk.tjc.co.uk 10 2026-05-03 2026-08-29 ok
cloud.em.tjc.co.uk 1 2026-03-05 2026-03-05 ok
image.em.tjc.co.uk 2 2026-02-13 2026-02-13 ok
click.em.tjc.co.uk 1 2026-03-05 2026-03-05 ok
view.em.tjc.co.uk 1 2026-03-05 2026-03-05 ok
tgm.tjc.co.uk 1 2026-08-27 2026-08-27 ok
zlupp.tjc.co.uk 12 2026-04-16 2026-08-12 ok
pages.tjc.co.uk 1 2026-02-02 2026-02-02 nxdomain
accounts.tjc.co.uk 3 2026-06-22 2026-08-21 ok
www.tjc.co.uk 5 2026-06-22 2026-09-25 ok
*.www.tjc.co.uk 2 2026-06-22 2026-06-22 —
shopify.tjc.co.uk 3 2026-06-22 2026-08-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/tjc.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/tjc.co.uk.