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.

6 hosts · 288 ms

HostCertsFirst seenLast seen
johnnyslicks.com 19 2026-05-16 2026-09-25
shop.johnnyslicks.com 4 2026-05-07 2026-05-07
mta-sts.johnnyslicks.com 2 2026-05-29 2026-08-08
account.johnnyslicks.com 6 2026-06-03 2026-09-30
www.johnnyslicks.com 15 2026-05-17 2026-09-25
buy.johnnyslicks.com 1 2026-09-18 2026-09-18

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