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.

22 hosts · 361 ms

HostCertsFirst seenLast seenDNS
avafin.cz 42 2026-04-12 2026-09-30 ok
*.avafin.cz 13 2026-04-12 2026-08-14 —
online.avafin.cz 15 2026-04-16 2026-09-22 ok
staging.online.avafin.cz 17 2026-05-02 2026-09-17 ok
track.avafin.cz 5 2026-05-27 2026-09-25 ok
click.avafin.cz 5 2026-05-14 2026-09-12 ok
l.avafin.cz 10 2026-05-09 2026-09-16 ok
go.avafin.cz 3 2026-07-29 2026-09-29 ok
mails.avafin.cz 4 2026-04-10 2026-08-08 ok
test.avafin.cz 11 2026-08-27 2026-09-28 nodata
*.test.avafin.cz 7 2026-08-27 2026-09-24 —
media.test.avafin.cz 6 2026-08-30 2026-09-24 ok
dev.test.avafin.cz 2 2026-08-30 2026-08-30 ok
*.dev.test.avafin.cz 2 2026-08-30 2026-08-30 —
media.dev.test.avafin.cz 4 2026-08-30 2026-09-01 ok
www.test.avafin.cz 2 2026-09-28 2026-09-28 ok
*.www.test.avafin.cz 2 2026-09-28 2026-09-28 —
www.preview.avafin.cz 5 2026-09-30 2026-09-30 ok
*.www.preview.avafin.cz 2 2026-09-30 2026-09-30 —
media.www.preview.avafin.cz 5 2026-09-30 2026-09-30 ok
www.avafin.cz 20 2026-05-15 2026-09-19 ok
media.www.avafin.cz 8 2026-09-30 2026-09-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/avafin.cz (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/avafin.cz.