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.

10 hosts · 307 ms

HostCertsFirst seenLast seenDNS
onekey.so 37 2026-04-10 2026-10-04 ok
*.onekey.so 13 2026-04-29 2026-09-07 —
help.onekey.so 9 2026-06-06 2026-10-02 ok
shop.onekey.so 5 2026-06-04 2026-10-01 ok
ems.onekey.so 10 2026-04-13 2026-08-09 ok
*.ems.onekey.so 10 2026-04-13 2026-08-09 —
orders.onekey.so 13 2026-05-03 2026-09-13 ok
mtg-assets.onekey.so 14 2026-04-10 2026-10-04 ok
status.onekey.so 5 2026-05-04 2026-08-30 ok
blog-legacy.onekey.so 11 2026-05-29 2026-09-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/onekey.so (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/onekey.so.