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.

17 hosts · 340 ms

HostCertsFirst seenLast seenDNS
emporiaresearch.com 42 2025-06-16 2026-09-14 ok
*.emporiaresearch.com 25 2025-06-16 2026-08-15 —
beta.emporiaresearch.com 4 2026-09-21 2026-09-21 nodata
*.beta.emporiaresearch.com 4 2026-09-21 2026-09-21 —
zz-rehearsal.beta.emporiaresearch.com 1 2026-09-30 2026-09-30 nodata
*.zz-rehearsal.beta.emporiaresearch.com 1 2026-09-30 2026-09-30 —
track.outbound.emporiaresearch.com 5 2026-05-23 2026-09-19 ok
postal.emporiaresearch.com 5 2026-05-19 2026-09-15 ok
track.postal.emporiaresearch.com 8 2026-05-21 2026-09-18 ok
mx.postal.emporiaresearch.com 5 2026-05-22 2026-09-19 ok
t.mail.emporiaresearch.com 5 2026-05-23 2026-09-20 ok
t.m.emporiaresearch.com 5 2026-05-11 2026-09-08 ok
t.r.emporiaresearch.com 6 2026-06-02 2026-09-30 ok
polis.emporiaresearch.com 4 2025-08-13 2026-07-17 ok
*.polis.emporiaresearch.com 4 2025-08-13 2026-07-17 —
www.emporiaresearch.com 12 2026-05-19 2026-09-14 ok
t.community.emporiaresearch.com 5 2026-06-02 2026-09-30 ok

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