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.

50 hosts · 370 ms

HostCertsFirst seenLast seenDNS
soptim.de 5 2026-05-04 2026-09-01 ok
a2-nws-fw-1.soptim.de 1 2026-02-27 2026-02-27 ok
www.a2-nws-fw-1.soptim.de 1 2026-02-27 2026-02-27 nxdomain
e-nws-fw-1.soptim.de 9 2026-02-27 2026-10-06 ok
www.e-nws-fw-1.soptim.de 1 2026-02-27 2026-02-27 nxdomain
mail4.soptim.de 2 2025-08-05 2026-08-26 ok
www.mail4.soptim.de 2 2025-08-05 2026-08-26 nxdomain
sbc-a.soptim.de 1 2026-04-30 2026-04-30 ok
www.sbc-a.soptim.de 1 2026-04-30 2026-04-30 nxdomain
static.soptim.de 5 2026-05-04 2026-09-01 ok
fgh.grafana.qc.soptim.de 3 2026-07-07 2026-09-05 ok
rwth-aachen.grafana.qc.soptim.de 9 2026-05-26 2026-09-23 ok
leitungspartner.grafana.qc.soptim.de 9 2026-04-30 2026-09-01 ok
dev-cluster.grafana.qc.soptim.de 9 2026-05-05 2026-09-29 ok
keycloak.qc.soptim.de 5 2026-05-05 2026-09-02 ok
dev-cluster.keycloak.qc.soptim.de 3 2026-04-21 2026-05-05 ok
fgh.wams.qc.soptim.de 3 2026-07-07 2026-09-05 ok
rwth-aachen.wams.qc.soptim.de 9 2026-05-26 2026-09-23 ok
leitungspartner.wams.qc.soptim.de 7 2026-04-30 2026-09-01 ok
dev-cluster.wams.qc.soptim.de 12 2026-02-04 2026-09-29 ok
www.dev-cluster.wams.qc.soptim.de 1 2026-02-04 2026-02-04 nxdomain
fgh.mqtt.qc.soptim.de 3 2026-07-07 2026-09-05 ok
rwth-aachen.mqtt.qc.soptim.de 7 2026-05-26 2026-09-23 ok
leitungspartner.mqtt.qc.soptim.de 5 2026-05-04 2026-09-01 ok
dev-cluster.mqtt.qc.soptim.de 5 2026-06-01 2026-09-29 ok
hybrid.soptim.de 2 2025-09-04 2026-09-17 ok
exchange.soptim.de 2 2025-09-04 2026-09-17 ok
karriere.soptim.de 1 2026-09-29 2026-09-29 ok
serviceportal.soptim.de 10 2026-04-29 2026-08-27 ok
spse.polarion.soptim.de 4 2026-04-16 2026-08-15 ok
res.polarion.soptim.de 4 2026-04-16 2026-08-15 ok
horizon.soptim.de 1 2025-10-16 2025-10-16 ok
www.horizon.soptim.de 1 2025-10-16 2025-10-16 nxdomain
sso.soptim.de 4 2026-04-16 2026-08-14 ok
imap.soptim.de 2 2025-09-04 2026-09-17 nxdomain
smtp.soptim.de 2 2025-09-04 2026-09-17 nxdomain
transfer.soptim.de 3 2025-09-30 2026-09-25 ok
autodiscover.soptim.de 2 2025-09-04 2026-09-17 ok
qr.soptim.de 4 2026-04-16 2026-08-15 ok
mak-pur.soptim.de 4 2026-04-16 2026-08-15 ok
opencgmes.soptim.de 3 2026-06-22 2026-08-21 ok
tickets.soptim.de 5 2026-05-02 2026-08-30 ok
rdfarchitect.soptim.de 5 2026-04-28 2026-08-26 ok
account.soptim.de 5 2026-05-02 2026-08-30 ok
hubspot.soptim.de 4 2026-04-16 2026-08-15 ok
view.soptim.de 1 2025-08-08 2025-08-08 ok
www.view.soptim.de 1 2025-08-08 2025-08-08 nxdomain
www.soptim.de 5 2026-05-04 2026-09-01 ok
community.soptim.de 5 2026-04-29 2026-08-27 ok
llm-bedrock-proxy.soptim.de 5 2026-05-30 2026-09-28 ok

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