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.

14 hosts · 210 ms

HostCertsFirst seenLast seen
atmail.com 9 2025-10-20 2026-07-17
*.atmail.com 9 2025-10-20 2026-07-17
1password-scim-bridge.atmail.com 4 2026-04-14 2026-08-12
billing.atmail.com 2 2026-01-05 2026-07-15
mpl.atmail.com 4 2026-06-06 2026-10-06
vpn.atmail.com 2 2026-04-16 2026-09-16
dev-vpn.atmail.com 3 2026-04-16 2026-09-16
aws-signup.atmail.com 1 2026-05-09 2026-05-09
*.us.pubsvcs.atmail.com 2 2025-10-01 2026-09-01
*.au.pubsvcs.atmail.com 3 2025-09-30 2026-08-31
*.eu.pubsvcs.atmail.com 2 2025-10-01 2026-09-01
support.atmail.com 5 2026-04-24 2026-08-22
aws-signup-dev.atmail.com 1 2026-01-27 2026-01-27
docs.sdev.atmail.com 2 2026-08-26 2026-08-26

Programmatic access: API GET /v1/hosts/atmail.com (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/atmail.com.