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.

6 hosts · 348 ms

HostCertsFirst seenLast seenDNS
blu.bank 2 2025-10-16 2026-10-02 ok
BLICG.blu.bank 1 2025-09-08 2025-09-08 —
blicg.blu.bank 2 2026-08-05 2026-08-05 ok
mail.blu.bank 2 2025-10-16 2026-10-02 ok
vpn.blu.bank 1 2026-05-13 2026-05-13 ok
www.blu.bank 2 2025-10-16 2026-10-02 ok

Programmatic access, with DNS A records: API GET /v1/hosts/blu.bank (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/blu.bank.