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.

15 hosts · 267 ms

HostCertsFirst seenLast seenDNS
starlingbank.com 26 2025-07-07 2026-10-01 ok
*.starlingbank.com 26 2025-07-07 2026-10-01 —
api-openbanking.starlingbank.com 3 2026-04-22 2026-09-22 ok
accounting.starlingbank.com 4 2026-04-25 2026-10-06 ok
token-api.starlingbank.com 1 2026-06-04 2026-06-04 ok
admin.starlingbank.com 2 2026-04-22 2026-09-22 ok
engineering-admin.starlingbank.com 2 2026-03-24 2026-08-24 ok
registration.starlingbank.com 1 2026-09-22 2026-09-22 ok
app.starlingbank.com 1 2025-11-19 2025-11-19 ok
cics.starlingbank.com 3 2025-10-07 2026-09-04 nodata
updates.starlingbank.com 25 2026-04-21 2026-10-03 ok
*.updates.starlingbank.com 16 2026-06-07 2026-10-03 —
api-openbanking-sandbox.starlingbank.com 3 2026-04-22 2026-09-22 ok
token-api-sandbox.starlingbank.com 2 2025-12-01 2026-06-04 ok
teamcity.starlingbank.com 2 2026-04-01 2026-09-01 ok

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