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.

39 hosts · 240 ms

HostCertsFirst seenLast seenDNS
gsr.io 13 2026-04-26 2026-08-22 ok
*.gsr.io 21 2025-09-14 2026-09-20 —
dbs-prod-dc.gsr.io 5 2026-04-22 2026-09-03 nxdomain
*.gitpod.gsr.io 1 2025-09-17 2025-09-17 —
ona-prod.gsr.io 1 2026-02-06 2026-02-06 ok
*.ona-prod.gsr.io 1 2026-02-06 2026-02-06 —
oracle.pre-prod.gsr.io 8 2026-05-06 2026-09-01 ok
overwatch-prod.gsr.io 5 2026-05-11 2026-09-08 ok
*.prod.gsr.io 1 2026-01-28 2026-01-28 —
oracle.prod.gsr.io 10 2026-04-30 2026-08-26 ok
aegis.prod.gsr.io 10 2026-05-10 2026-09-05 ok
oracle-us.prod.gsr.io 3 2026-07-21 2026-07-21 nxdomain
*.preprod.gsr.io 1 2025-11-28 2025-11-28 —
home.gsr.io 1 2026-02-17 2026-02-17 ok
api.home.gsr.io 3 2026-02-17 2026-07-30 ok
one.gsr.io 20 2026-04-27 2026-09-30 ok
gsrone.gsr.io 5 2026-05-13 2026-09-10 ok
www.gsrone.gsr.io 12 2026-05-12 2026-09-08 ok
trading.gsr.io 12 2026-05-15 2026-09-10 ok
sso-trading.gsr.io 13 2026-05-20 2026-09-16 ok
individual.onboarding.gsr.io 2 2026-08-01 2026-08-01 ok
*.individual.onboarding.gsr.io 2 2026-08-01 2026-08-01 —
marketing.gsr.io 9 2026-04-12 2026-09-09 ok
reporting.gsr.io 4 2026-06-01 2026-09-29 ok
trading-api.gsr.io 11 2026-05-26 2026-09-21 ok
trading-algo.gsr.io 8 2026-06-07 2026-10-03 ok
gsr-transformer.gsr.io 27 2026-04-27 2026-08-24 ok
content.gsr.io 18 2026-04-27 2026-09-12 ok
podcast.gsr.io 9 2026-06-04 2026-10-01 ok
www.podcast.gsr.io 10 2026-06-04 2026-10-01 ok
trust.gsr.io 10 2026-05-08 2026-09-03 ok
catalyst.gsr.io 2 2026-05-11 2026-05-11 ok
*.catalyst.gsr.io 2 2026-05-20 2026-05-20 —
overwatch-dev.gsr.io 5 2026-05-12 2026-09-09 ok
*.dev.gsr.io 2 2025-09-14 2026-08-15 —
reporting.dev.gsr.io 17 2026-04-26 2026-09-25 ok
aegis.dev.gsr.io 10 2026-04-29 2026-08-26 ok
*.srv.gsr.io 2 2026-05-01 2026-10-01 —
advisory.gsr.io 5 2026-05-17 2026-09-15 ok

Programmatic access, with DNS A records: API GET /v1/hosts/gsr.io (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/gsr.io.