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.

12 hosts · 258 ms

Download CSV
HostCertsFirst seenLast seen
portsgroup.com 4 2025-08-25 2026-09-14
*.portsgroup.com 2 2025-08-25 2026-08-26
mail03.portsgroup.com 1 2026-06-10 2026-06-10
exchange.portsgroup.com 2 2025-07-07 2026-07-06
meeting.portsgroup.com 10 2026-05-01 2026-08-28
webmail.portsgroup.com 1 2026-06-10 2026-06-10
antispam.portsgroup.com 3 2025-10-14 2026-10-13
obp.portsgroup.com 1 2025-06-30 2025-06-30
*.obp.portsgroup.com 1 2025-06-30 2025-06-30
lp.portsgroup.com 8 2026-05-01 2026-08-20
AutoDiscover.portsgroup.com 2 2025-07-07 2026-07-06
www.portsgroup.com 2 2026-03-27 2026-09-14

Programmatic access: API GET /v1/hosts/portsgroup.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/portsgroup.com.