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.

23 hosts · 266 ms

HostCertsFirst seenLast seen
johnnywas.com 2 2026-01-19 2026-01-19
*.johnnywas.com 2 2026-01-19 2026-01-19
mta-sts.em9100.johnnywas.com 3 2026-06-10 2026-09-01
rlm2.johnnywas.com 3 2026-06-11 2026-09-08
preloved.johnnywas.com 7 2026-04-25 2026-09-04
www.preloved.johnnywas.com 19 2026-04-12 2026-10-08
dev-old.johnnywas.com 10 2026-04-14 2026-10-08
mta-sts.bounce.johnnywas.com 3 2026-07-03 2026-09-24
store.johnnywas.com 10 2026-04-28 2026-09-25
cliff.johnnywas.com 7 2026-05-25 2026-09-21
stg.johnnywas.com 15 2026-04-14 2026-10-08
link.johnnywas.com 14 2026-04-27 2026-08-23
mta-sts.email.johnnywas.com 4 2026-04-27 2026-07-19
aem.johnnywas.com 4 2025-09-22 2026-09-14
ssdcollection.johnnywas.com 5 2026-05-20 2026-09-11
mta-sts.mailer8ho.johnnywas.com 4 2026-05-01 2026-07-23
scriptsio.johnnywas.com 1 2026-02-10 2026-02-10
oms.johnnywas.com 4 2025-08-05 2026-08-04
www.oms.johnnywas.com 3 2026-06-15 2026-08-04
mta-sts.johnnywas.com 3 2026-05-25 2026-08-16
dev.johnnywas.com 16 2026-06-01 2026-09-27
stg-new.johnnywas.com 20 2026-05-21 2026-09-16
www.johnnywas.com 14 2026-04-15 2026-08-11

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