Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

26 hosts · 188 ms

HostCertsFirst seenLast seen
csba-rzud-3002.ubsdev.com 3 2026-03-17 2026-10-01
csba-njl2-3004.ubsdev.com 2 2026-02-26 2026-09-03
csba-azeus2-3007.ubsdev.com 4 2025-09-08 2026-09-03
csba-az04-3007.ubsdev.com 2 2026-01-23 2026-03-31
workspace-v-ldn1.ra.ubsdev.com 1 2025-11-10 2025-11-10
workspace.ra.ubsdev.com 2 2025-09-11 2026-09-04
connectme.ra.ubsdev.com 1 2026-01-15 2026-01-15
workspace-ldn.ra.ubsdev.com 1 2026-05-07 2026-05-07
cem-ldn.ra.ubsdev.com 1 2026-03-20 2026-03-20
workspace-zur.ra.ubsdev.com 1 2026-05-11 2026-05-11
test-myhub.ubsdev.com 4 2025-07-18 2026-06-29
dev-myhub.ubsdev.com 3 2025-07-17 2026-06-29
csba-njl2-3001-gc.ubsdev.com 1 2026-06-25 2026-06-25
mag.ubsdev.com 4 2025-07-15 2026-04-17
PostfixExo.ubsdev.com 1 2025-12-09 2025-12-09
mcsappexo.ubsdev.com 1 2026-01-09 2026-01-09
mail4cnp.ubsdev.com 1 2025-10-17 2025-10-17
teamsvr-amer.ubsdev.com 4 2025-09-22 2026-08-12
pimrequestvalidator.ubsdev.com 2 2026-03-25 2026-03-25
az-bt-teams.ubsdev.com 4 2025-08-11 2026-07-28
sse-syslog.adns.ubsdev.com 2 2026-09-18 2026-09-18
umsts.ubsdev.com 1 2026-01-07 2026-01-07
mstu.ubsdev.com 2 2026-03-24 2026-09-25
whereami-dev.ubsdev.com 5 2025-10-03 2026-09-30
pimrequestvalidator-dev.ubsdev.com 1 2026-03-17 2026-03-17
mhm-proxy.ubsdev.com 4 2025-09-30 2026-09-11

Programmatic access: API GET /v1/hosts/ubsdev.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/ubsdev.com.