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 · 344 ms

HostCertsFirst seenLast seenDNS
m3.mail.adobe.com 4 2025-06-13 2026-05-20 ok
res3.mail.adobe.com 5 2025-06-13 2026-05-20 ok
t3.mail.adobe.com 4 2025-06-13 2026-05-20 ok
m4.mail.adobe.com 4 2025-06-13 2026-05-20 ok
m5.mail.adobe.com 4 2025-06-13 2026-05-20 ok
m6.mail.adobe.com 4 2025-06-13 2026-05-20 ok
m7.mail.adobe.com 4 2025-06-13 2026-05-20 ok
t-qa.mail.adobe.com 2 2025-09-08 2026-08-09 ok
m1-page.mail.adobe.com 1 2025-10-02 2025-10-02 nxdomain
m2-page.mail.adobe.com 2 2025-10-02 2025-10-02 nxdomain
m3-page.mail.adobe.com 2 2025-10-02 2025-10-02 nxdomain
t-stg.mail.adobe.com 2 2025-09-08 2026-08-09 ok
m-info.mail.adobe.com 2 2025-09-08 2026-08-09 nxdomain
t-info.mail.adobe.com 2 2025-09-08 2026-08-09 ok
t-dev.mail.adobe.com 2 2025-09-08 2026-08-09 ok

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