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.

13 hosts · 226 ms

HostCertsFirst seenLast seen
northerner.com 42 2025-06-20 2026-09-29
*.northerner.com 40 2025-06-20 2026-09-29
v3-prod.northerner.com 7 2026-05-23 2026-09-19
v3-release.northerner.com 11 2026-05-30 2026-09-26
staging.northerner.com 2 2026-04-20 2026-09-20
m.northerner.com 9 2026-05-30 2026-09-25
pricem.northerner.com 2 2026-06-18 2026-06-18
staging-pricem.northerner.com 2 2026-06-18 2026-06-18
dev-pricem.northerner.com 2 2026-06-18 2026-06-18
v3-develop.northerner.com 12 2026-04-22 2026-08-19
media-assets.northerner.com 2 2026-09-22 2026-09-22
*.media-assets.northerner.com 2 2026-09-22 2026-09-22
dev.northerner.com 2 2026-04-20 2026-09-20

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