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.

27 hosts · 304 ms

HostCertsFirst seenLast seenDNS
valimail.com 16 2026-04-30 2026-08-27 ok
*.valimail.com 3 2026-01-06 2026-09-11 —
*.prod-euc1.valimail.com 1 2026-04-19 2026-04-19 —
api.prod-euc1.valimail.com 1 2026-04-19 2026-04-19 nxdomain
*.internal.prod-euc1.valimail.com 1 2026-04-19 2026-04-19 —
app.prod-euc1.valimail.com 1 2026-04-19 2026-04-19 nxdomain
partnerhub.valimail.com 10 2026-04-14 2026-08-10 ok
*.defend.valimail.com 2 2026-04-11 2026-09-11 —
*.us-west-2.defend.valimail.com 2 2026-04-11 2026-09-11 —
see.valimail.com 3 2026-04-21 2026-09-21 ok
use.valimail.com 8 2026-05-07 2026-09-03 ok
blog.valimail.com 16 2026-04-28 2026-08-24 ok
go.valimail.com 2 2026-03-27 2026-08-27 ok
*.app.valimail.com 1 2026-01-06 2026-01-06 —
*.us-west-2.app.valimail.com 1 2026-01-06 2026-01-06 —
domain-checker.valimail.com 2 2025-10-06 2026-09-05 ok
docs.valimail.com 2 2025-06-26 2026-05-26 nxdomain
mta-sts.valimail.com 4 2026-01-10 2026-08-24 ok
status.valimail.com 49 2026-05-21 2026-09-28 ok
ct.valimail.com 7 2026-04-28 2026-10-02 ok
get.valimail.com 12 2026-05-16 2026-09-12 ok
support.valimail.com 12 2026-04-21 2026-08-17 ok
trust.valimail.com 5 2026-05-16 2026-09-13 ok
www.valimail.com 14 2026-04-22 2026-08-31 ok
staging-www.valimail.com 16 2026-05-03 2026-08-29 ok
amplify.valimail.com 2 2026-04-12 2026-09-12 ok
security.valimail.com 12 2026-05-02 2026-08-28 ok

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