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 · 336 ms

HostCertsFirst seenLast seenDNS
atlashotels.co.uk 4 2026-04-18 2026-08-16 ok
owa.atlashotels.co.uk 1 2026-03-10 2026-03-10 ok
doc.atlashotels.co.uk 2 2025-08-24 2026-07-25 ok
phishing.atlashotels.co.uk 5 2026-05-01 2026-08-29 ok
vpn.atlashotels.co.uk 2 2026-03-24 2026-03-24 ok
www.vpn.atlashotels.co.uk 1 2026-03-24 2026-03-24 nxdomain
careers.atlashotels.co.uk 4 2026-04-12 2026-08-10 ok
mta-sts.atlashotels.co.uk 5 2026-05-11 2026-09-10 ok
www.atlashotels.co.uk 4 2026-04-18 2026-08-16 ok

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