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.

15 hosts · 778 ms

HostCertsFirst seenLast seenDNS
vyos.com 16 2026-04-11 2026-10-05 ok
*.vyos.com 16 2026-04-11 2026-10-05 —
jira.vyos.com 2 2025-07-22 2026-06-22 ok
internal.jira.vyos.com 2 2025-07-22 2026-06-22 ok
producthub.vyos.com 6 2026-06-13 2026-08-11 ok
confluence.vyos.com 1 2026-01-03 2026-01-03 ok
internal.confluence.vyos.com 1 2026-01-03 2026-01-03 ok
auth.vyos.com 10 2026-05-12 2026-09-07 ok
email.vyos.com 7 2026-05-27 2026-09-25 ok
cdn.vyos.com 2 2026-08-15 2026-08-15 ok
quotes.vyos.com 9 2026-06-02 2026-09-28 ok
account.vyos.com 3 2026-07-09 2026-09-10 ok
support.vyos.com 1 2026-01-03 2026-01-03 ok
customers.support.vyos.com 1 2026-01-03 2026-01-03 ok
bw.vyos.com 5 2026-06-26 2026-08-24 nxdomain

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