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.

10 hosts · 243 ms

HostCertsFirst seenLast seen
spotpetins.com 30 2026-04-26 2026-09-24
*.spotpetins.com 34 2025-11-05 2026-10-06
image.e.spotpetins.com 1 2026-02-03 2026-02-03
gw-staging.spotpetins.com 2 2025-07-12 2026-06-12
tracking.spotpetins.com 3 2026-01-19 2026-01-21
api.spotpetins.com 1 2025-12-10 2025-12-10
quote-api.spotpetins.com 2 2025-09-14 2026-08-15
dev-api.spotpetins.com 2 2025-09-30 2026-08-31
customer.spotpetins.com 7 2026-04-20 2026-08-19
quote-api-test.spotpetins.com 3 2025-09-14 2026-08-15

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