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 · 278 ms

HostCertsFirst seenLast seen
purehealthresearch.com 8 2026-05-22 2026-10-01
links1.purehealthresearch.com 3 2026-07-02 2026-08-31
secure2.purehealthresearch.com 5 2026-05-11 2026-10-06
service3.purehealthresearch.com 5 2026-05-26 2026-09-25
secure.purehealthresearch.com 6 2026-06-17 2026-09-07
tracking.purehealthresearch.com 4 2026-04-14 2026-08-12
blog.purehealthresearch.com 5 2026-05-18 2026-09-16
track.email.purehealthresearch.com 4 2026-06-08 2026-10-06
gtm.purehealthresearch.com 3 2026-05-08 2026-08-23
links.purehealthresearch.com 4 2026-07-03 2026-09-07
email.mails.purehealthresearch.com 4 2026-04-16 2026-08-14
sms.purehealthresearch.com 1 2026-07-17 2026-07-17
get.purehealthresearch.com 8 2026-04-15 2026-08-11
test.purehealthresearch.com 8 2026-05-18 2026-09-27
www.purehealthresearch.com 9 2026-05-22 2026-10-01

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