Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

25 hosts · 298 ms

Download CSV
HostCertsFirst seenLast seen
martrexo.com 6 2026-03-11 2026-08-30
*.martrexo.com 1 2026-03-11 2026-03-11
testing-mlspc.martrexo.com 5 2026-05-22 2026-09-18
unsubscribe.martrexo.com 9 2026-05-07 2026-08-26
newsletter-unsubscribe.martrexo.com 3 2026-07-27 2026-08-26
usage.martrexo.com 5 2026-04-30 2026-08-30
unsubscribe.vote.martrexo.com 7 2026-05-21 2026-08-26
cdn.vote.martrexo.com 3 2026-05-21 2026-09-03
inboxdetective.martrexo.com 5 2026-05-18 2026-09-16
cg.martrexo.com 5 2026-05-21 2026-09-18
autoconfig.martrexo.com 5 2026-05-27 2026-09-24
staging.martrexo.com 2 2026-08-14 2026-10-14
voting.martrexo.com 6 2026-05-04 2026-09-01
homeinstead-ie-api.martrexo.com 5 2026-06-02 2026-10-02
homeinstead-ch-api.martrexo.com 5 2026-05-16 2026-09-15
picasso.martrexo.com 5 2026-05-08 2026-09-05
newsletter.martrexo.com 2 2026-07-27 2026-09-21
autodiscover.martrexo.com 5 2026-05-27 2026-09-24
pdfeditor.martrexo.com 5 2026-04-30 2026-08-30
analytics.martrexo.com 4 2026-06-15 2026-10-14
gateway-analytics.martrexo.com 5 2026-05-13 2026-09-11
assets.martrexo.com 5 2026-04-24 2026-10-03
news.martrexo.com 2 2026-08-08 2026-10-07
pdfeditor-int.martrexo.com 5 2026-04-30 2026-08-30
www.martrexo.com 5 2026-04-30 2026-08-30

Programmatic access: API GET /v1/hosts/martrexo.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/martrexo.com.