Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

43 hosts · 396 ms

HostCertsFirst seenLast seenDNS
treated.com 20 2025-12-24 2026-09-19 ok
*.treated.com 15 2025-12-24 2026-09-10 —
globalstaging1.treated.com 2 2026-08-27 2026-08-27 ok
ca.treated.com 5 2026-05-19 2026-09-19 ok
global-qa.treated.com 2 2026-02-19 2026-06-12 ok
admin-uk-data.treated.com 2 2026-02-23 2026-06-15 ok
ae.treated.com 5 2026-05-19 2026-09-19 ok
admin-ae.treated.com 1 2026-05-16 2026-05-16 ok
de.treated.com 5 2026-05-19 2026-09-19 ok
serverside.treated.com 3 2026-05-21 2026-09-03 ok
ee.treated.com 5 2026-05-19 2026-09-19 ok
se.treated.com 5 2026-05-19 2026-09-19 ok
affiliate.treated.com 4 2025-09-03 2026-09-04 ok
www.affiliate.treated.com 2 2026-09-04 2026-09-04 nxdomain
bg.treated.com 5 2026-05-19 2026-09-19 ok
global-staging.treated.com 3 2026-02-22 2026-10-06 ok
ch.treated.com 5 2026-05-19 2026-09-19 ok
fi.treated.com 5 2026-05-19 2026-09-19 ok
si.treated.com 5 2026-05-19 2026-09-19 ok
dk.treated.com 5 2026-05-19 2026-09-19 ok
sk.treated.com 5 2026-05-19 2026-09-19 ok
uk.treated.com 5 2026-05-19 2026-09-19 ok
global.treated.com 4 2026-02-22 2026-10-06 ok
cl.treated.com 5 2026-05-19 2026-09-19 ok
nl.treated.com 5 2026-05-19 2026-09-19 ok
pl.treated.com 5 2026-05-19 2026-09-19 ok
in.treated.com 5 2026-05-19 2026-09-19 ok
no.treated.com 5 2026-04-28 2026-08-28 ok
ro.treated.com 5 2026-05-19 2026-09-19 ok
saxo.treated.com 2 2026-02-24 2026-06-16 ok
fr.treated.com 5 2026-05-19 2026-09-19 ok
hr.treated.com 5 2026-05-19 2026-09-19 ok
cs.treated.com 9 2026-04-24 2026-08-20 ok
es.treated.com 5 2026-05-19 2026-09-19 ok
guidelines.treated.com 5 2026-05-01 2026-08-31 ok
sms.treated.com 4 2026-05-08 2026-08-23 ok
lt.treated.com 5 2026-05-19 2026-09-19 ok
pt.treated.com 5 2026-05-19 2026-09-19 ok
au.treated.com 5 2026-05-19 2026-09-19 ok
data-eu.treated.com 4 2026-06-02 2026-09-19 ok
lv.treated.com 5 2026-05-19 2026-09-19 ok
www.treated.com 5 2026-05-19 2026-09-19 ok
mx.treated.com 5 2026-05-19 2026-09-19 ok

Programmatic access, with DNS A records: API GET /v1/hosts/treated.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/treated.com.