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.

22 hosts · 234 ms

HostCertsFirst seenLast seenDNS
npca.org 9 2026-05-26 2026-09-23 ok
esa.npca.org 5 2026-05-18 2026-09-15 ok
brand.npca.org 5 2026-06-02 2026-09-15 ok
www.brand.npca.org 5 2026-06-02 2026-09-15 ok
science.npca.org 5 2026-05-15 2026-09-07 ok
www.science.npca.org 5 2026-05-10 2026-09-02 ok
yellowstone.npca.org 5 2026-05-17 2026-09-14 ok
secure.npca.org 8 2026-04-23 2026-09-20 ok
give.npca.org 12 2026-04-13 2026-08-10 ok
helpdesk.npca.org 11 2026-05-18 2026-09-14 ok
vpn.npca.org 2 2025-07-21 2026-07-29 ok
www.vpn.npca.org 2 2025-07-21 2026-07-29 nxdomain
email.axioshq.npca.org 5 2026-05-18 2026-09-15 ok
pages.npca.org 5 2026-06-01 2026-09-29 ok
maps.npca.org 5 2026-05-17 2026-09-14 ok
sheets.npca.org 7 2026-05-25 2026-09-23 ok
act.npca.org 8 2026-05-07 2026-09-02 ok
parkit.npca.org 9 2026-04-20 2026-09-17 ok
email.cart.npca.org 5 2026-05-16 2026-09-12 ok
support.npca.org 8 2026-05-06 2026-09-01 ok
www.npca.org 10 2026-04-23 2026-08-21 ok
my.npca.org 6 2026-06-09 2026-10-07 ok

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