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.

15 hosts · 269 ms

HostCertsFirst seenLast seen
cranprep.org 19 2026-02-17 2026-10-03
*.cranprep.org 1 2026-02-17 2026-02-17
old.cranprep.org 7 2026-05-25 2026-09-22
smugmug.cranprep.org 7 2026-03-20 2026-08-23
sportsdesk.cranprep.org 5 2026-05-23 2026-09-12
mail.cranprep.org 1 2025-07-11 2025-07-11
on.cranprep.org 5 2026-04-22 2026-09-07
raiseaconcern.cranprep.org 5 2026-05-11 2026-09-08
promo.cranprep.org 5 2026-05-28 2026-09-25
calendar.cranprep.org 5 2026-05-26 2026-09-14
autodiscover.cranprep.org 1 2025-07-11 2025-07-11
parents.cranprep.org 5 2026-05-26 2026-09-23
mta-sts.cranprep.org 5 2026-06-08 2026-10-06
vmt.cranprep.org 5 2026-05-19 2026-09-16
www.cranprep.org 18 2026-04-29 2026-10-03

Programmatic access: API GET /v1/hosts/cranprep.org (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/cranprep.org.