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.

42 hosts · 367 ms

HostCertsFirst seenLast seenDNS
catalystcorp.org 16 2026-04-22 2026-09-21 ok
*.catalystcorp.org 16 2026-04-22 2026-09-21 —
vpn1.catalystcorp.org 2 2025-07-15 2026-07-16 ok
pvpn1.catalystcorp.org 1 2026-01-07 2026-01-07 ok
catvpn1.catalystcorp.org 1 2026-05-18 2026-05-18 ok
sponsor1.catalystcorp.org 2 2025-09-22 2026-09-23 nxdomain
guest1.catalystcorp.org 2 2025-09-22 2026-09-23 nxdomain
vpn2.catalystcorp.org 2 2025-07-15 2026-07-16 ok
pvpn2.catalystcorp.org 1 2026-01-07 2026-01-07 ok
catvpn2.catalystcorp.org 1 2026-05-18 2026-05-18 ok
sponsor2.catalystcorp.org 2 2025-09-22 2026-09-23 nxdomain
guest2.catalystcorp.org 2 2025-09-22 2026-09-23 nxdomain
tcapiqa.catalystcorp.org 3 2026-03-02 2026-08-17 ok
finqa.catalystcorp.org 2 2025-09-26 2026-09-28 ok
tc.catalystcorp.org 2 2026-04-29 2026-04-29 ok
Finprod.catalystcorp.org 2 2025-09-26 2026-09-28 —
self-service.catalystcorp.org 1 2026-01-28 2026-01-28 ok
Anywhere.catalystcorp.org 2 2025-07-15 2026-07-16 —
link.catalystcorp.org 9 2026-04-10 2026-09-06 ok
Vdesk.catalystcorp.org 1 2025-10-10 2025-10-10 —
mail.catalystcorp.org 2 2025-07-15 2026-07-16 ok
ncratm.catalystcorp.org 2 2025-11-13 2025-11-13 ok
enterpriseregistration.catalystcorp.org 4 2026-03-06 2026-08-21 ok
vpn.catalystcorp.org 2 2025-07-15 2026-07-16 ok
pvpn.catalystcorp.org 1 2026-01-07 2026-01-07 ok
catvpn.catalystcorp.org 1 2026-05-18 2026-05-18 ok
AdjustmentSSO.p.catalystcorp.org 4 2026-04-07 2026-09-22 —
smtp.catalystcorp.org 2 2025-07-15 2026-07-16 ok
AdjustmentSSO.q.catalystcorp.org 2 2025-06-17 2026-06-18 —
transfer.catalystcorp.org 3 2026-03-06 2026-08-21 ok
Autodiscover.catalystcorp.org 2 2025-07-15 2026-07-16 —
fs.catalystcorp.org 4 2026-03-06 2026-08-21 nxdomain
adfs.catalystcorp.org 4 2026-03-06 2026-08-21 nxdomain
contracts.catalystcorp.org 2 2026-02-21 2026-06-13 ok
p.payments.catalystcorp.org 6 2025-06-23 2026-07-22 ok
u.payments.catalystcorp.org 2 2025-07-14 2026-06-14 ok
buuat.catalystcorp.org 2 2025-06-30 2026-07-01 ok
ncratmtest.catalystcorp.org 1 2025-12-15 2025-12-15 ok
bu.catalystcorp.org 2 2025-06-30 2026-07-01 ok
Relay.catalystcorp.org 2 2025-07-15 2026-07-16 —
securecopy.catalystcorp.org 1 2025-11-21 2025-11-21 ok
valsecurecopy.catalystcorp.org 1 2025-11-21 2025-11-21 ok

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