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.

16 hosts · 222 ms

HostCertsFirst seenLast seenDNS
1-account.com 6 2025-09-25 2026-06-15 ok
*.1-account.com 7 2025-09-25 2026-06-15 —
stg.1-account.com 12 2025-09-25 2026-09-28 nodata
*.stg.1-account.com 12 2025-09-25 2026-09-28 —
stg1.stg.1-account.com 1 2025-10-29 2025-10-29 ok
denki.stg.1-account.com 2 2026-05-27 2026-05-27 ok
*.denki.stg.1-account.com 2 2026-05-27 2026-05-27 —
denki.1-account.com 2 2026-05-22 2026-05-22 ok
opesys-denki.1-account.com 2 2026-06-15 2026-06-15 ok
*.denki.1-account.com 2 2026-05-22 2026-05-22 —
kakeibo.1-account.com 2 2026-05-22 2026-05-22 ok
*.kakeibo.1-account.com 2 2026-05-22 2026-05-22 —
dev.1-account.com 4 2026-05-27 2026-05-29 nodata
*.dev.1-account.com 4 2026-05-27 2026-05-29 —
denki.dev.1-account.com 2 2026-05-27 2026-05-27 ok
*.denki.dev.1-account.com 2 2026-05-27 2026-05-27 —

Programmatic access, with DNS A records: API GET /v1/hosts/1-account.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/1-account.com.