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.

26 hosts · 335 ms

HostCertsFirst seenLast seenDNS
vercel.com 10 2026-05-19 2026-09-25 ok
*.vercel.com 5 2026-05-23 2026-09-25 —
cdn1.vercel.com 5 2026-05-22 2026-09-25 ok
*.ri2.vercel.com 5 2026-04-25 2026-08-27 —
cdn2.vercel.com 4 2026-05-22 2026-07-24 ok
partners-classic.vercel.com 18 2026-05-28 2026-09-23 ok
upflow-email.billing.vercel.com 5 2026-05-13 2026-09-10 ok
auth.vercel.com 10 2026-04-21 2026-08-17 ok
*.pcosti.vercel.com 5 2026-05-13 2026-09-14 —
admin.vercel.com 8 2026-05-23 2026-09-24 ok
*.admin.vercel.com 5 2026-05-23 2026-09-24 —
saml-authentication.vercel.com 15 2026-05-08 2026-09-22 ok
*.saml-authentication.vercel.com 5 2026-05-20 2026-09-22 —
info.vercel.com 8 2026-06-02 2026-06-02 ok
email.info.vercel.com 3 2026-06-04 2026-09-23 ok
go.vercel.com 21 2026-05-10 2026-09-28 ok
*.go.vercel.com 5 2026-05-10 2026-09-12 —
customerio.vercel.com 2 2026-07-31 2026-09-23 ok
image.ship.vercel.com 2 2026-01-21 2026-01-21 ok
examples.vercel.com 5 2026-05-23 2026-09-26 ok
*.examples.vercel.com 5 2026-05-23 2026-09-26 —
kms.vercel.com 2 2026-03-09 2026-08-09 ok
assets.vercel.com 6 2025-07-08 2026-08-25 ok
datarequest.vercel.com 2 2025-06-12 2026-05-13 ok
checkout.vercel.com 8 2026-04-20 2026-08-16 ok
security.vercel.com 10 2026-05-19 2026-09-14 ok

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