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.

12 hosts · 374 ms

HostCertsFirst seenLast seenDNS
premiumoutlets.com 11 2026-01-22 2026-09-24 ok
trx-pre.premiumoutlets.com 3 2026-09-09 2026-09-29 ok
sli.premiumoutlets.com 2 2025-09-28 2026-08-29 ok
ca.email.premiumoutlets.com 4 2026-04-09 2026-08-07 ok
e.email.premiumoutlets.com 4 2026-04-09 2026-08-07 ok
preferences.email.premiumoutlets.com 4 2026-04-09 2026-08-07 ok
images.email.premiumoutlets.com 2 2025-08-30 2026-07-31 ok
view.email.premiumoutlets.com 2 2025-08-30 2026-07-31 ok
gtm.premiumoutlets.com 5 2026-05-14 2026-09-11 ok
load.gtm.premiumoutlets.com 12 2026-05-25 2026-09-20 ok
www.premiumoutlets.com 11 2026-01-22 2026-09-24 ok
trx.premiumoutlets.com 1 2026-09-24 2026-09-24 ok

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