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.

50 hosts · 381 ms

HostCertsFirst seenLast seenDNS
column.com 2 2026-03-17 2026-08-17 ok
*.column.com 8 2026-02-21 2026-08-17 —
napier-prod.column.com 1 2025-12-08 2025-12-08 ok
*.napier-prod.column.com 1 2025-12-08 2025-12-08 —
cat-mq.zelle.column.com 1 2026-08-31 2026-08-31 —
travelrule.column.com 2 2026-01-07 2026-01-07 ok
trellis-staging.column.com 2 2026-02-27 2026-07-30 ok
us-west-2.cd.prod.tch.column.com 1 2025-11-05 2025-11-05 nxdomain
sig2.rtp.prod.tch.column.com 3 2025-09-01 2026-07-07 nxdomain
sig3.rtp.prod.tch.column.com 1 2026-07-07 2026-07-07 nxdomain
sig.rtp.prod.tch.column.com 1 2025-09-01 2025-09-01 nxdomain
api.rtp.prod.tch.column.com 1 2026-01-09 2026-01-09 nxdomain
us-west-2.mq.prod.tch.column.com 1 2025-11-05 2025-11-05 nxdomain
us-west-2.mq.tch.column.com 1 2026-02-27 2026-02-27 nxdomain
us-west-2.cd.test.tch.column.com 1 2025-11-07 2025-11-07 nxdomain
sig2.rtp.test.tch.column.com 3 2026-02-25 2026-07-07 nxdomain
sig3.rtp.test.tch.column.com 1 2026-07-07 2026-07-07 nxdomain
sig.rtp.test.tch.column.com 1 2026-02-23 2026-02-23 nxdomain
api.rtp.test.tch.column.com 1 2026-01-05 2026-01-05 nxdomain
us-west-2.mq.test.tch.column.com 1 2025-11-05 2025-11-05 nxdomain
reveal.pci.column.com 3 2026-06-06 2026-08-15 ok
api.column.com 8 2026-03-03 2026-07-27 ok
trellis-staging-webhook.column.com 2 2026-02-27 2026-07-30 ok
trellis-webhook.column.com 2 2025-10-03 2026-09-03 ok
retool.column.com 3 2025-10-16 2026-09-16 ok
*.retool.column.com 1 2025-11-30 2025-11-30 —
censio.column.com 1 2026-03-18 2026-03-18 nxdomain
hello.column.com 4 2026-04-21 2026-08-17 ok
demo.column.com 3 2026-06-29 2026-08-28 nxdomain
atlas.column.com 2 2026-04-02 2026-09-02 nxdomain
holdings.column.com 2 2026-04-29 2026-09-29 ok
trellis.column.com 3 2025-09-04 2026-08-05 ok
*.apps.column.com 1 2026-06-28 2026-06-28 —
internalapps.column.com 5 2026-06-10 2026-08-28 nxdomain
partners.column.com 1 2026-04-15 2026-04-15 nxdomain
*.partners.column.com 2 2026-01-06 2026-01-06 —
status.column.com 5 2026-05-18 2026-09-14 ok
swift.column.com 1 2025-11-07 2025-11-07 ok
scim-bridge.it.column.com 1 2025-08-05 2025-08-05 nxdomain
jamf.it.column.com 2 2025-09-03 2026-08-04 ok
kaizen-api.it.column.com 1 2025-07-22 2025-07-22 nxdomain
kaizen.it.column.com 1 2025-07-18 2025-07-18 nxdomain
hyper-runner.kaizen.it.column.com 1 2025-07-25 2025-07-25 nxdomain
hyper.kaizen.it.column.com 1 2025-07-22 2025-07-22 nxdomain
trellis-audit.column.com 1 2026-07-01 2026-07-01 ok
reveal.pci-sandbox.column.com 5 2026-05-07 2026-09-24 ok
demo-sandbox.column.com 3 2026-06-29 2026-08-28 nxdomain
rhino-sandbox.column.com 1 2026-07-04 2026-07-04 ok
rhino-simserver-sandbox.column.com 1 2026-07-18 2026-07-18 ok
internalapps-sandbox.column.com 5 2026-06-10 2026-08-28 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/column.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/column.com.