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.

49 hosts · 203 ms

HostCertsFirst seenLast seen
securityscorecard.io 2 2025-09-27 2026-08-27
*.securityscorecard.io 4 2025-09-25 2026-08-25
auth.stage.securityscorecard.io 10 2026-05-05 2026-08-31
www.prototype.securityscorecard.io 12 2026-05-19 2026-09-15
url2639.response.securityscorecard.io 3 2026-09-17 2026-09-17
auth.securityscorecard.io 10 2026-05-14 2026-09-09
titanapi.securityscorecard.io 1 2026-06-18 2026-06-18
*.titanapi.securityscorecard.io 1 2026-06-18 2026-06-18
stage.titanapi.securityscorecard.io 2 2026-06-24 2026-06-25
*.stage.titanapi.securityscorecard.io 2 2026-06-24 2026-06-25
demo.titanapi.securityscorecard.io 1 2026-06-17 2026-06-17
*.demo.titanapi.securityscorecard.io 1 2026-06-17 2026-06-17
docs.titanapi.securityscorecard.io 3 2026-07-06 2026-08-27
track.securityscorecard.io 1 2026-09-23 2026-09-23
link.securityscorecard.io 7 2026-04-25 2026-08-25
*.link.securityscorecard.io 7 2026-04-25 2026-08-25
gsnlink.securityscorecard.io 3 2026-05-04 2026-10-04
portal.team.securityscorecard.io 4 2026-05-31 2026-09-18
secops.team.securityscorecard.io 3 2026-05-05 2026-08-22
cdn.securityscorecard.io 2 2026-03-16 2026-08-16
stage-cdn.securityscorecard.io 1 2025-12-29 2025-12-29
*.stage-cdn.securityscorecard.io 1 2025-12-29 2025-12-29
demo-cdn.securityscorecard.io 2 2026-03-16 2026-08-16
*.demo-cdn.securityscorecard.io 2 2026-03-16 2026-08-16
*.cdn.securityscorecard.io 2 2026-03-16 2026-08-16
auth.demo.securityscorecard.io 12 2026-05-14 2026-09-10
app.securityscorecard.io 2 2025-08-13 2026-06-18
*.app.securityscorecard.io 2 2025-08-13 2026-06-18
stage.app.securityscorecard.io 4 2025-12-29 2026-06-25
*.stage.app.securityscorecard.io 2 2025-12-29 2026-06-25
demo.app.securityscorecard.io 2 2025-08-13 2026-06-17
*.demo.app.securityscorecard.io 2 2025-08-13 2026-06-17
stage-scdr.securityscorecard.io 4 2025-07-25 2026-06-25
*.stage-scdr.securityscorecard.io 4 2025-07-25 2026-06-25
demo-scdr.securityscorecard.io 1 2025-08-06 2025-08-06
*.demo-scdr.securityscorecard.io 1 2025-08-06 2025-08-06
atlas.securityscorecard.io 2 2026-03-28 2026-08-28
*.atlas.securityscorecard.io 2 2026-03-28 2026-08-28
links.securityscorecard.io 8 2026-04-25 2026-09-15
*.links.securityscorecard.io 8 2026-04-25 2026-09-15
connectors.securityscorecard.io 1 2026-09-24 2026-09-24
*.connectors.securityscorecard.io 1 2026-09-24 2026-09-24
stage.connectors.securityscorecard.io 1 2026-09-24 2026-09-24
*.stage.connectors.securityscorecard.io 1 2026-09-24 2026-09-24
platform-dev-access.securityscorecard.io 8 2026-05-08 2026-09-08
mta-sts.securityscorecard.io 4 2026-06-07 2026-10-05
meet.securityscorecard.io 5 2026-05-18 2026-08-10
smart.securityscorecard.io 5 2026-04-27 2026-08-25
www.securityscorecard.io 2 2025-09-27 2026-08-27

Programmatic access: API GET /v1/hosts/securityscorecard.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/securityscorecard.io.