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.

18 hosts · 264 ms

HostCertsFirst seenLast seen
portablenorthpole.com 9 2025-12-28 2026-08-28
*.portablenorthpole.com 4 2025-12-28 2026-08-07
url1877.portablenorthpole.com 2 2025-07-07 2026-06-07
sanoma.portablenorthpole.com 5 2026-05-03 2026-08-31
data.portablenorthpole.com 3 2026-05-05 2026-08-21
beta.portablenorthpole.com 4 2026-04-17 2026-08-17
url4305.santa.portablenorthpole.com 2 2025-07-07 2026-06-07
rc.portablenorthpole.com 5 2026-04-22 2026-08-25
og-track.portablenorthpole.com 2 2025-09-23 2026-08-24
email.portablenorthpole.com 2 2025-07-07 2026-06-07
url7444.email.portablenorthpole.com 2 2025-07-07 2026-06-07
url3772.op.portablenorthpole.com 2 2025-07-07 2026-06-07
og-images.portablenorthpole.com 2 2025-10-20 2026-08-24
alternates.portablenorthpole.com 2 2026-01-20 2026-01-20
url3906.santaclaus.portablenorthpole.com 2 2025-07-07 2026-06-07
url330.marketing-low.portablenorthpole.com 2 2025-07-07 2026-06-07
url7102.em5316.marketing-low.portablenorthpole.com 2 2025-07-07 2026-06-07
www.portablenorthpole.com 5 2026-04-23 2026-08-26

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