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.

22 hosts · 216 ms

HostCertsFirst seenLast seen
phantom.com 35 2026-04-22 2026-10-02
*.phantom.com 27 2026-05-04 2026-10-02
staging-web.phantom.com 12 2026-05-22 2026-09-18
trade.phantom.com 5 2026-05-08 2026-09-09
cookie.phantom.com 15 2026-05-02 2026-09-03
store.phantom.com 4 2026-04-19 2026-08-15
staging.phantom.com 18 2026-04-22 2026-08-19
help-staging.phantom.com 4 2026-04-21 2026-08-23
feedback.phantom.com 10 2026-05-03 2026-08-29
portal-internal.phantom.com 7 2026-06-07 2026-06-07
clicks.notification.phantom.com 8 2026-05-05 2026-08-31
go.phantom.com 21 2026-05-26 2026-09-22
web-studio.phantom.com 15 2026-05-05 2026-09-16
staging-web-studio.phantom.com 22 2026-05-21 2026-09-18
app-studio.phantom.com 20 2026-04-29 2026-08-30
demo.phantom.com 4 2026-06-10 2026-10-10
help.phantom.com 5 2026-05-13 2026-08-19
docs.phantom.com 5 2026-05-12 2026-09-13
clicks.updates.phantom.com 8 2026-05-05 2026-08-31
status.phantom.com 4 2026-06-04 2026-10-03
checkout.phantom.com 5 2026-06-11 2026-10-08
www.phantom.com 20 2026-04-22 2026-08-19

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