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.

20 hosts · 313 ms

HostCertsFirst seenLast seenDNS
newtonbaby.com 18 2026-04-10 2026-09-24 ok
*.newtonbaby.com 5 2026-04-10 2026-07-19 —
share.newtonbaby.com 5 2026-06-03 2026-09-29 ok
hdnse.newtonbaby.com 6 2026-05-01 2026-08-27 ok
social.newtonbaby.com 11 2026-04-09 2026-10-03 ok
trk.email.newtonbaby.com 10 2026-05-19 2026-09-14 ok
returns.newtonbaby.com 10 2026-05-16 2026-09-12 ok
enews.newtonbaby.com 8 2026-04-24 2026-04-24 nxdomain
account.newtonbaby.com 15 2026-04-12 2026-08-22 ok
list.newtonbaby.com 2 2026-04-20 2026-04-20 nxdomain
rb8je30v.newtonbaby.com 6 2026-04-28 2026-08-22 ok
qa-env.newtonbaby.com 4 2026-09-14 2026-09-14 nodata
*.qa-env.newtonbaby.com 4 2026-09-14 2026-09-14 —
v.qa-env.newtonbaby.com 1 2026-09-15 2026-09-15 ok
*.v.qa-env.newtonbaby.com 1 2026-09-16 2026-09-16 —
qa-new.newtonbaby.com 1 2026-09-11 2026-09-11 ok
v.qa-new.newtonbaby.com 1 2026-09-16 2026-09-16 ok
*.v.qa-new.newtonbaby.com 2 2026-09-16 2026-09-16 —
www.newtonbaby.com 14 2026-05-16 2026-09-25 ok
tx.newtonbaby.com 4 2026-05-01 2026-05-01 nxdomain

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