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.

7 hosts · 285 ms

HostCertsFirst seenLast seenDNS
sophinvest.com 4 2026-06-07 2026-08-06 ok
fund.sophinvest.com 8 2026-05-13 2026-09-08 ok
ai.sophinvest.com 1 2026-08-15 2026-08-15 ok
email.mail.sophinvest.com 5 2026-05-24 2026-09-21 ok
esign.sophinvest.com 1 2026-08-17 2026-08-17 ok
admin.sophinvest.com 9 2026-04-14 2026-08-16 ok
www.sophinvest.com 4 2026-06-07 2026-08-06 servfail

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