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.

32 hosts · 331 ms

HostCertsFirst seenLast seenDNS
merox.io 42 2026-04-16 2026-10-03 ok
*.merox.io 12 2026-04-16 2026-10-03 —
mta-sts.fwdkim1.merox.io 1 2026-08-31 2026-08-31 ok
distrib.merox.io 1 2026-09-21 2026-09-21 ok
preprod.distrib.merox.io 1 2026-06-30 2026-06-30 ok
static.merox.io 2 2026-01-15 2026-06-10 ok
mta-sts.billing.merox.io 1 2026-08-31 2026-08-31 ok
blog.merox.io 8 2026-04-23 2026-08-19 ok
auth.merox.io 2 2026-01-21 2026-06-12 ok
api.merox.io 3 2026-01-24 2026-07-09 ok
doc.api.merox.io 2 2026-01-21 2026-06-12 ok
check.merox.io 2 2026-04-27 2026-08-19 ok
portal.merox.io 17 2026-02-14 2026-09-28 ok
preprod.portal.merox.io 3 2026-02-14 2026-06-22 ok
mta-sts.em.merox.io 1 2026-08-31 2026-08-31 ok
migration.merox.io 2 2026-01-15 2026-06-10 ok
lp.merox.io 8 2026-04-23 2026-08-20 ok
mta-sts.bnc3.app.merox.io 4 2026-06-05 2026-10-03 ok
mta-sts.app.merox.io 4 2026-04-13 2026-08-11 ok
partner.merox.io 4 2026-02-22 2026-10-06 ok
preprod.partner.merox.io 3 2026-02-14 2026-06-22 ok
mta-sts.mta-sts-hosting-monitor.merox.io 5 2026-05-24 2026-09-22 ok
files.merox.io 10 2026-04-23 2026-08-19 ok
insights.merox.io 2 2026-02-10 2026-07-05 ok
www.insights.merox.io 2 2026-02-24 2026-07-15 ok
mta-sts.merox.io 5 2026-01-15 2026-08-11 ok
status.merox.io 5 2026-05-02 2026-08-29 ok
management.merox.io 3 2026-02-14 2026-09-28 ok
preprod.management.merox.io 2 2026-02-23 2026-06-22 ok
support.merox.io 16 2026-05-13 2026-09-09 ok
www.merox.io 18 2026-02-26 2026-09-23 ok
mta-sts.emailsecurity.merox.io 3 2026-05-15 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/merox.io (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/merox.io.