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.

9 hosts · 234 ms

HostCertsFirst seenLast seenDNS
vivus.bg 10 2026-04-20 2026-08-16 ok
*.vivus.bg 6 2026-01-01 2026-10-04 —
cola.vivus.bg 5 2026-04-25 2026-08-23 nodata
cola-bgn.vivus.bg 5 2026-05-16 2026-09-13 nxdomain
go.vivus.bg 6 2026-05-20 2026-09-17 ok
polezno.vivus.bg 6 2026-04-28 2026-08-24 ok
help.vivus.bg 1 2026-09-01 2026-09-01 ok
client.vivus.bg 5 2026-04-27 2026-08-24 ok
www.vivus.bg 11 2026-04-20 2026-08-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/vivus.bg (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/vivus.bg.