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.

31 hosts · 347 ms

HostCertsFirst seenLast seenDNS
adventurecu.org 20 2026-03-30 2026-10-05 ok
*.adventurecu.org 15 2026-04-28 2026-08-29 —
online.adventurecu.org 15 2025-12-28 2026-09-21 ok
*.online.adventurecu.org 14 2026-04-17 2026-09-21 —
www.online.adventurecu.org 1 2025-12-28 2025-12-28 nxdomain
share.adventurecu.org 5 2026-05-15 2026-09-10 ok
wifi.adventurecu.org 12 2026-05-29 2026-08-27 nxdomain
www.wifi.adventurecu.org 4 2026-05-29 2026-06-18 nxdomain
mail.adventurecu.org 10 2025-06-10 2026-06-30 ok
www.mail.adventurecu.org 5 2025-06-10 2026-06-12 nxdomain
securemail.adventurecu.org 2 2026-04-10 2026-04-17 ok
www.securemail.adventurecu.org 2 2026-04-10 2026-04-17 nxdomain
join.adventurecu.org 5 2026-05-12 2026-09-13 ok
vpn.adventurecu.org 4 2025-07-09 2026-06-30 ok
www.vpn.adventurecu.org 2 2025-07-09 2025-07-09 nxdomain
symitar.adventurecu.org 1 2025-11-21 2025-11-21 nxdomain
www.symitar.adventurecu.org 1 2025-11-21 2025-11-21 nxdomain
ranger.adventurecu.org 2 2025-06-25 2026-05-26 ok
thoughtfarmer.adventurecu.org 3 2025-06-30 2026-07-30 ok
www.thoughtfarmer.adventurecu.org 1 2025-06-30 2025-06-30 nxdomain
autodiscover.adventurecu.org 8 2025-06-10 2026-06-30 ok
automator.adventurecu.org 3 2026-04-11 2026-06-30 ok
www.automator.adventurecu.org 2 2026-04-11 2026-04-21 nxdomain
qr.adventurecu.org 4 2026-05-22 2026-07-30 ok
pages.adventurecu.org 5 2026-05-01 2026-08-29 ok
fs.adventurecu.org 4 2025-12-11 2026-06-30 ok
www.fs.adventurecu.org 2 2025-12-11 2025-12-11 nxdomain
clearpass.adventurecu.org 4 2025-11-20 2026-06-30 ok
www.clearpass.adventurecu.org 3 2025-11-20 2025-12-09 nxdomain
text.adventurecu.org 3 2025-07-14 2026-07-29 ok
www.adventurecu.org 5 2026-03-30 2026-10-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/adventurecu.org (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/adventurecu.org.