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.

38 hosts · 247 ms

HostCertsFirst seenLast seenDNS
mta.org 39 2026-02-26 2026-09-16 ok
*.mta.org 33 2026-02-26 2026-09-16 —
gw01.mta.org 11 2026-06-07 2026-10-04 ok
pac1.mta.org 7 2026-07-02 2026-08-30 ok
sfmc2.mta.org 12 2026-05-14 2026-09-10 ok
sfmc.mta.org 12 2026-05-15 2026-09-10 ok
mtaazapim-poc.mta.org 8 2026-04-19 2026-08-15 ok
sdcontgd.mta.org 10 2026-04-20 2026-08-17 ok
mtatodayd.mta.org 12 2026-04-29 2026-08-25 ok
dwsig.mta.org 4 2026-07-03 2026-08-12 ok
lirr-rules-training.mta.org 2 2025-07-15 2026-06-15 ok
pki.mta.org 8 2026-07-08 2026-09-09 nodata
*.pki.mta.org 8 2026-07-08 2026-09-09 —
cloud.crm.mta.org 1 2026-01-06 2026-01-06 ok
image.crm.mta.org 1 2026-02-12 2026-02-12 ok
drm.mta.org 10 2026-05-15 2026-09-11 ok
on.mta.org 2 2026-05-08 2026-05-11 ok
cloud.info.mta.org 1 2026-05-25 2026-05-25 ok
image.info.mta.org 5 2025-07-08 2026-08-18 ok
click.info.mta.org 1 2026-05-26 2026-05-26 ok
view.info.mta.org 1 2026-05-22 2026-05-22 ok
sdcontgp.mta.org 12 2026-04-18 2026-08-15 ok
autodiscover.mta.org 1 2025-08-12 2025-08-12 ok
lucas.mta.org 8 2026-05-03 2026-08-30 ok
mydevices.mta.org 12 2026-05-14 2026-09-10 ok
cloud.employeecomms.mta.org 2 2026-04-07 2026-09-08 ok
image.employeecomms.mta.org 3 2026-04-09 2026-09-09 ok
click.employeecomms.mta.org 2 2026-04-07 2026-09-09 ok
view.employeecomms.mta.org 2 2026-04-07 2026-09-08 ok
careers.mta.org 8 2026-05-11 2026-09-06 ok
mnr-ops-training-tests.mta.org 3 2025-06-11 2026-05-21 ok
mtaittalent.mta.org 3 2026-05-12 2026-09-24 ok
eammobilefndtest.mta.org 8 2026-05-04 2026-08-30 ok
mtatodayu.mta.org 8 2026-04-29 2026-08-25 ok
drmdev.mta.org 8 2026-04-15 2026-08-11 ok
www.mta.org 6 2026-04-10 2026-09-09 ok
mtatoday.mta.org 8 2026-05-14 2026-09-10 ok
cloudaz.mta.org 8 2026-04-13 2026-08-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mta.org (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/mta.org.