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.

18 hosts · 405 ms

HostCertsFirst seenLast seenDNS
joko.com 4 2025-09-07 2026-09-15 ok
*.joko.com 4 2025-09-07 2026-09-15 —
media.joko.com 6 2026-05-10 2026-09-05 ok
prod.joko.com 2 2026-04-29 2026-09-29 nodata
*.prod.joko.com 4 2026-04-29 2026-10-01 —
juno.prod.joko.com 2 2026-08-25 2026-08-25 ok
home.joko.com 6 2026-04-22 2026-08-19 ok
ai-adoption.joko.com 12 2026-06-03 2026-09-29 ok
linko.joko.com 12 2026-05-19 2026-09-14 ok
ship.joko.com 4 2026-04-16 2026-08-14 ok
app.joko.com 3 2025-07-13 2026-09-17 ok
dev.app.joko.com 5 2025-07-23 2026-09-16 ok
partners.joko.com 4 2026-04-14 2026-08-12 ok
support.joko.com 8 2026-04-25 2026-08-21 ok
dev.joko.com 4 2026-04-29 2026-09-29 nodata
*.dev.joko.com 6 2026-04-29 2026-10-01 —
preview.joko.com 2 2026-04-29 2026-09-29 nodata
*.preview.joko.com 2 2026-04-29 2026-09-29 —

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