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.

44 hosts · 371 ms

HostCertsFirst seenLast seenDNS
plansecur.de 5 2026-05-11 2026-10-05 ok
*.plansecur.de 1 2026-05-11 2026-05-11 —
servicemanage2.plansecur.de 5 2026-05-11 2026-08-29 ok
servicemanage3.plansecur.de 5 2026-05-11 2026-08-29 ok
web.plansecur.de 5 2026-05-05 2026-08-23 ok
kubus-service.plansecur.de 5 2026-05-08 2026-08-26 ok
kontaktaufnahme.plansecur.de 2 2026-05-05 2026-05-05 nxdomain
kundenakte.plansecur.de 2 2026-02-28 2026-06-21 ok
ze.plansecur.de 5 2026-05-13 2026-09-28 ok
img.plansecur.de 5 2026-06-01 2026-09-29 ok
kubus-service-staging.plansecur.de 5 2026-05-18 2026-09-05 ok
bportal-staging.plansecur.de 2 2026-02-24 2026-06-16 ok
kportal-staging.plansecur.de 2 2026-02-23 2026-06-15 ok
insign-staging.plansecur.de 7 2026-05-11 2026-09-28 ok
beraterportal.plansecur.de 3 2026-02-20 2026-10-04 ok
berater-werden.plansecur.de 4 2026-04-21 2026-08-19 ok
insign.plansecur.de 5 2026-05-13 2026-09-28 ok
mein.plansecur.de 4 2026-02-20 2026-10-04 ok
rn.plansecur.de 5 2026-05-08 2026-08-26 ok
matomo.plansecur.de 5 2026-05-27 2026-09-24 ok
m365-mcp.plansecur.de 1 2026-08-21 2026-08-21 ok
kubus-serv-exp.plansecur.de 6 2026-05-18 2026-08-04 ok
dateitransfer.plansecur.de 10 2026-05-01 2026-10-01 ok
mailings.plansecur.de 5 2026-06-02 2026-09-20 ok
chat.plansecur.de 5 2026-06-01 2026-09-29 ok
infonet.plansecur.de 5 2026-05-11 2026-09-07 ok
kubus-test.plansecur.de 5 2026-05-17 2026-09-04 ok
innendienst.plansecur.de 3 2026-08-24 2026-08-27 ok
kundenakte-dev.plansecur.de 2 2026-02-25 2026-06-18 ok
bportal-dev.plansecur.de 3 2026-02-20 2026-10-04 ok
kportal-dev.plansecur.de 3 2026-02-20 2026-10-04 ok
brevo-dev.plansecur.de 9 2026-05-05 2026-09-20 ok
innendienst-dev.plansecur.de 4 2026-08-24 2026-08-27 ok
bportal-next-dev.plansecur.de 2 2026-05-07 2026-08-30 ok
kportal-next-dev.plansecur.de 3 2026-03-11 2026-07-04 ok
abrechnungsarchiv-dev.plansecur.de 3 2026-02-21 2026-10-05 ok
id-serv-dev.plansecur.de 3 2026-07-10 2026-09-04 ok
kubus-serv-dev.plansecur.de 10 2026-04-29 2026-09-03 ok
identity-dev.plansecur.de 10 2026-05-17 2026-09-12 ok
abrechnungsarchiv.plansecur.de 2 2026-03-11 2026-06-25 ok
id-serv.plansecur.de 1 2026-08-28 2026-08-28 ok
pw.plansecur.de 5 2026-05-17 2026-09-04 ok
www.plansecur.de 4 2026-06-07 2026-10-05 ok
identity.plansecur.de 5 2026-05-08 2026-08-26 ok

Programmatic access, with DNS A records: API GET /v1/hosts/plansecur.de (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/plansecur.de.