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 · 325 ms

HostCertsFirst seenLast seenDNS
osmos.ai 12 2026-05-31 2026-09-26 ok
*.osmos.ai 1 2026-06-01 2026-06-01 —
hub.osmos.ai 4 2026-04-14 2026-08-16 ok
dev-hub.osmos.ai 14 2026-06-07 2026-10-03 ok
rmhc.osmos.ai 5 2026-05-30 2026-09-29 ok
website-lead.osmos.ai 4 2026-05-31 2026-07-31 ok
cx-scorecard.osmos.ai 7 2026-05-28 2026-10-01 ok
flash-stage.osmos.ai 1 2026-10-07 2026-10-07 ok
collaborate.osmos.ai 1 2026-02-11 2026-02-11 ok
hub-staging.osmos.ai 4 2026-04-14 2026-08-16 ok
flash.osmos.ai 5 2026-07-31 2026-10-01 ok
apollo-247-growth.osmos.ai 3 2026-07-10 2026-09-12 ok
fpg-growth.osmos.ai 2 2026-08-05 2026-10-06 ok
collaborate.api.osmos.ai 1 2026-02-11 2026-02-11 ok
smb-network.osmos.ai 4 2026-06-02 2026-10-06 ok
osmos-admin.osmos.ai 5 2026-05-29 2026-09-29 ok
dealroom-cms.osmos.ai 11 2026-05-22 2026-09-17 ok
api-status.osmos.ai 5 2026-05-27 2026-09-24 ok
www.osmos.ai 10 2026-05-25 2026-09-20 ok
gumlet-sandbox.osmos.ai 13 2026-05-31 2026-09-26 ok
in-store-utility.osmos.ai 4 2026-05-18 2026-07-19 nxdomain
security.osmos.ai 5 2026-05-06 2026-09-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/osmos.ai (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/osmos.ai.