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.

23 hosts · 344 ms

HostCertsFirst seenLast seenDNS
adn.com 6 2026-01-14 2026-07-18 ok
*.adn.com 8 2026-01-07 2026-09-21 —
k203.adn.com 1 2025-12-14 2025-12-14 ok
beta.adn.com 4 2026-04-14 2026-09-01 ok
ai-hub.adn.com 1 2026-09-29 2026-09-29 ok
subscribe.adn.com 2 2026-01-25 2026-06-22 ok
nie.adn.com 5 2026-05-14 2026-09-13 ok
staff.adn.com 3 2026-05-28 2026-09-14 ok
hiring.adn.com 5 2026-05-20 2026-10-03 ok
sli.adn.com 1 2025-12-21 2025-12-21 ok
enews.email.adn.com 14 2026-04-25 2026-08-21 ok
on.adn.com 4 2026-04-11 2026-08-27 ok
jobs.adn.com 7 2026-05-09 2026-10-05 ok
iservices.adn.com 2 2026-01-26 2026-06-23 ok
circulars.adn.com 5 2026-05-09 2026-09-08 ok
mg2access.adn.com 4 2026-02-15 2026-09-29 ok
contracts.adn.com 2 2026-09-15 2026-09-15 ok
tollbit.adn.com 17 2026-04-29 2026-09-19 ok
myaccount.adn.com 19 2026-05-23 2026-10-04 ok
checkout.adn.com 19 2026-05-23 2026-10-04 ok
www.adn.com 4 2026-04-14 2026-09-01 ok
pay.adn.com 3 2025-08-18 2026-08-18 ok
www.pay.adn.com 3 2025-08-18 2026-08-18 nxdomain

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