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.

34 hosts · 387 ms

HostCertsFirst seenLast seenDNS
rare.org 12 2025-07-05 2026-08-28 ok
*.rare.org 5 2025-07-05 2026-07-19 —
data.rare.org 8 2026-05-05 2026-09-01 ok
elab.rare.org 4 2026-04-18 2026-08-16 ok
impactbond.rare.org 6 2026-07-20 2026-09-17 ok
link.impactbond.rare.org 3 2026-07-29 2026-09-27 ok
salesforce.rare.org 2 2026-01-26 2026-06-23 ok
agriculture.rare.org 7 2025-08-13 2026-09-04 ok
translate.rare.org 4 2026-04-13 2026-08-11 ok
give.rare.org 10 2026-05-06 2026-09-01 ok
adaptiveplanning.rare.org 1 2025-10-16 2025-10-16 nxdomain
catch-carbon-api.rare.org 1 2025-08-14 2025-08-14 nxdomain
*.catch-carbon-api.rare.org 1 2025-08-14 2025-08-14 —
assetbank.rare.org 4 2026-04-20 2026-08-24 ok
link.rare.org 4 2026-04-14 2026-08-12 ok
portal.rare.org 5 2026-05-04 2026-09-04 ok
cloud.email.rare.org 3 2026-03-24 2026-08-25 servfail
image.email.rare.org 4 2026-01-21 2026-09-08 ok
click.email.rare.org 3 2026-03-24 2026-08-25 ok
view.email.rare.org 3 2026-03-24 2026-08-31 ok
catchcarbon.rare.org 1 2025-07-06 2025-07-06 nxdomain
*.catchcarbon.rare.org 1 2025-07-06 2025-07-06 —
sandbox.catchcarbon.rare.org 1 2025-07-06 2025-07-06 nxdomain
*.sandbox.catchcarbon.rare.org 1 2025-07-06 2025-07-06 —
learn.rare.org 19 2026-05-04 2026-09-05 ok
ffleap.rare.org 6 2026-05-12 2026-08-13 ok
rareup.rare.org 19 2026-04-18 2026-08-30 ok
behavior.rare.org 5 2026-04-29 2026-08-27 ok
behaviour.rare.org 5 2026-04-29 2026-08-27 ok
files.rare.org 2 2025-11-28 2026-01-08 ok
www.files.rare.org 2 2025-11-28 2026-01-08 nxdomain
catch-carbon-payments.rare.org 1 2025-09-27 2025-09-27 nxdomain
*.catch-carbon-payments.rare.org 1 2025-09-27 2025-09-27 —
www.rare.org 7 2026-04-30 2026-08-28 ok

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