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.

59 hosts · 201 ms

HostCertsFirst seenLast seen
gmx.net 5 2026-02-03 2026-08-12
*.gmx.net 4 2026-03-11 2026-08-12
mx00.gmx.net 1 2026-01-08 2026-01-08
i0.gmx.net 1 2025-12-18 2025-12-18
mx01.gmx.net 1 2026-01-08 2026-01-08
dpag-service-qa.gmx.net 2 2025-10-14 2026-09-03
verify.login-qa.gmx.net 1 2026-01-08 2026-01-08
webdav-pre.mc.gmx.net 2 2025-10-14 2026-09-02
www.webdav-pre.mc.gmx.net 2 2025-10-14 2026-09-02
webdav.mc.gmx.net 3 2026-03-11 2026-08-17
cad.gmx.net 1 2025-10-14 2025-10-14
*.cad.gmx.net 1 2025-10-14 2025-10-14
ident-eid.gmx.net 1 2026-06-10 2026-06-10
mout-xforward.gmx.net 1 2025-11-18 2025-11-18
dpag-service.gmx.net 2 2025-10-14 2026-09-03
mout-bounce.gmx.net 1 2025-11-18 2025-11-18
hilfe.gmx.net 1 2026-03-03 2026-03-03
www.hilfe.gmx.net 1 2026-03-03 2026-03-03
mailxchange.gmx.net 2 2025-08-05 2025-11-11
kundenportal.energie.gmx.net 1 2025-08-05 2025-08-05
www.energie.gmx.net 1 2025-07-17 2025-07-17
freephone.gmx.net 3 2025-08-05 2026-07-07
*.freephone.gmx.net 3 2025-08-05 2026-07-07
navigator-pre.gmx.net 1 2026-02-03 2026-02-03
*.navigator-pre.gmx.net 1 2026-02-03 2026-02-03
mx00.emig.gmx.net 1 2026-01-08 2026-01-08
mx01.emig.gmx.net 1 2026-01-08 2026-01-08
dhmx01.emig.gmx.net 1 2026-01-08 2026-01-08
dhmx02.emig.gmx.net 1 2026-01-08 2026-01-08
img.gmx.net 1 2025-12-18 2025-12-18
*.1.damoh.gmx.net 1 2026-03-03 2026-03-03
*.2.damoh.gmx.net 1 2026-03-03 2026-03-03
*.3.damoh.gmx.net 1 2026-03-03 2026-03-03
dl.gmx.net 1 2025-12-18 2025-12-18
gewinnspiel.gmx.net 2 2025-10-14 2026-09-02
www.gewinnspiel.gmx.net 2 2025-10-14 2026-09-02
mail.gmx.net 1 2025-11-18 2025-11-18
dhmail.gmx.net 1 2026-01-08 2026-01-08
newsroom.gmx.net 2 2025-07-11 2026-07-01
verify.login.gmx.net 1 2026-01-08 2026-01-08
phpmyadmin.gmx.net 1 2026-02-16 2026-02-16
www.phpmyadmin.gmx.net 1 2026-02-16 2026-02-16
www.lotto.gmx.net 1 2026-02-03 2026-02-03
imap.gmx.net 1 2025-11-18 2025-11-18
pop.gmx.net 1 2025-11-18 2025-11-18
smtp.gmx.net 1 2025-11-18 2025-11-18
tknauer.gmx.net 1 2026-05-12 2026-05-12
*.navigator.gmx.net 2 2026-03-03 2026-08-12
js.gmx.net 1 2025-12-18 2025-12-18
mta-sts.gmx.net 2 2026-03-11 2026-08-17
kontakt.gmx.net 1 2026-03-03 2026-03-03
www.kontakt.gmx.net 1 2026-03-03 2026-03-03
mout.gmx.net 1 2025-11-18 2025-11-18
v.gmx.net 1 2025-12-18 2025-12-18
www.gmx.net 2 2025-11-18 2026-02-03
*.www.gmx.net 1 2025-11-18 2025-11-18
cad.www.gmx.net 1 2026-03-03 2026-03-03
*.cad.www.gmx.net 1 2026-03-03 2026-03-03
mx.gmx.net 1 2026-01-08 2026-01-08

Programmatic access: API GET /v1/hosts/gmx.net (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/gmx.net.