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.

14 hosts · 345 ms

HostCertsFirst seenLast seenDNS
acc-ef.org 8 2026-05-17 2026-09-22 ok
webdisk.acc-ef.org 8 2026-05-17 2026-09-22 ok
cpanel.acc-ef.org 8 2026-05-17 2026-09-22 ok
mail.acc-ef.org 8 2026-05-17 2026-09-22 ok
webmail.acc-ef.org 8 2026-05-17 2026-09-22 ok
wcu-foundation.acc-ef.org 9 2026-05-27 2026-09-26 ok
www.wcu-foundation.acc-ef.org 9 2026-05-27 2026-09-26 ok
cloud.info.acc-ef.org 2 2025-10-12 2026-09-29 servfail
image.info.acc-ef.org 3 2026-02-12 2026-09-07 ok
click.info.acc-ef.org 2 2025-10-12 2026-09-29 ok
view.info.acc-ef.org 2 2025-10-12 2026-09-30 servfail
cpcalendars.acc-ef.org 8 2026-05-17 2026-09-22 ok
cpcontacts.acc-ef.org 8 2026-05-17 2026-09-22 ok
www.acc-ef.org 8 2026-05-17 2026-09-22 ok

Programmatic access, with DNS A records: API GET /v1/hosts/acc-ef.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/acc-ef.org.