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.

21 hosts · 341 ms

HostCertsFirst seenLast seenDNS
a2mac1.com 6 2025-12-11 2026-08-15 ok
*.a2mac1.com 1 2025-12-11 2025-12-11 —
legacy-prd.a2mac1.com 1 2026-04-28 2026-04-28 ok
legacy-dev-app-staging.a2mac1.com 2 2026-03-13 2026-07-06 ok
2025americassymposium.a2mac1.com 1 2026-02-18 2026-02-18 ok
sales-companion.a2mac1.com 2 2026-03-06 2026-06-30 ok
portfolio.a2mac1.com 2 2026-06-03 2026-06-03 ok
legacy-dev-app.a2mac1.com 2 2026-03-13 2026-07-06 ok
legacy-app.a2mac1.com 2 2026-04-28 2026-08-20 ok
sonar.a2mac1.com 2 2026-02-27 2026-06-21 ok
insightscenter.a2mac1.com 3 2026-05-20 2026-08-04 ok
certificates.a2mac1.com 12 2026-05-05 2026-08-31 ok
mta-sts.a2mac1.com 1 2026-01-14 2026-01-14 ok
status.a2mac1.com 10 2026-05-02 2026-08-30 ok
apimportal-dev.a2mac1.com 2 2026-06-16 2026-06-16 ok
api-scm-dev.a2mac1.com 1 2026-06-18 2026-06-18 ok
portfolio-dev.a2mac1.com 1 2026-06-03 2026-06-03 ok
api-management-dev.a2mac1.com 1 2026-06-18 2026-06-18 ok
legacy-dev.a2mac1.com 2 2026-02-13 2026-03-06 ok
legacy.a2mac1.com 1 2026-07-08 2026-07-08 ok
underbody.a2mac1.com 2 2026-03-12 2026-06-25 ok

Programmatic access, with DNS A records: API GET /v1/hosts/a2mac1.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/a2mac1.com.