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.

100 hosts (first page) · 362 ms

HostCertsFirst seenLast seenDNS
denic.de 6 2026-06-08 2026-10-01 ok
*.denic.de 6 2026-06-08 2026-10-01 —
secure-remote-1.denic.de 3 2026-06-02 2026-08-11 ok
list-1.denic.de 5 2026-04-27 2026-09-07 ok
mx1.area51.denic.de 4 2026-04-16 2026-08-25 ok
ssh-oob.fra1.denic.de 3 2026-06-02 2026-08-11 ok
ssh-oob.ams1.denic.de 3 2026-06-02 2026-08-11 ok
mx1.denic.de 6 2026-05-12 2026-10-06 ok
secure-remote-2.denic.de 7 2026-06-02 2026-08-11 ok
list-2.denic.de 5 2026-04-27 2026-09-07 ok
mx2.denic.de 6 2026-05-12 2026-10-06 ok
ssh-oob.fra3.denic.de 3 2026-06-11 2026-08-11 ok
mx3.denic.de 1 2026-09-14 2026-09-14 nxdomain
mx4.denic.de 1 2026-09-14 2026-09-14 nxdomain
secure-remote-1.v6.denic.de 3 2026-06-02 2026-08-11 nodata
*.beta.denic.de 6 2026-06-08 2026-10-01 —
exmon.sec.denic.de 3 2026-05-22 2026-08-11 ok
*.svc.denic.de 6 2026-06-08 2026-10-01 —
*.prod.denic.de 11 2026-04-23 2026-10-01 —
*.fra1.prod.denic.de 6 2026-06-08 2026-10-01 —
*.ams1.prod.denic.de 6 2026-06-08 2026-10-01 —
*.fra2.prod.denic.de 6 2026-06-08 2026-10-01 —
*.fra3.prod.denic.de 6 2026-06-08 2026-10-01 —
*.ha.prod.denic.de 6 2026-06-08 2026-10-01 —
*.infra.prod.denic.de 6 2026-06-08 2026-10-01 —
*.fra1.be.prod.denic.de 6 2026-04-10 2026-08-25 —
*.ams1.be.prod.denic.de 6 2026-04-10 2026-08-25 —
*.fra3.osl.be.prod.denic.de 6 2026-04-10 2026-08-25 —
*.gcp.prod.denic.de 6 2026-06-08 2026-10-01 —
*.cloud.denic.de 10 2026-04-27 2026-10-01 —
*.dev.cloud.denic.de 6 2026-06-08 2026-10-01 —
*.office.denic.de 6 2026-06-08 2026-10-01 —
vpn-gw-1-int.fra1.office.denic.de 3 2026-06-02 2026-08-11 nodata
vpn-gw-1-int.fra3.office.denic.de 3 2026-06-02 2026-08-11 nodata
w10304.office.denic.de 4 2026-04-15 2026-08-19 nxdomain
w10408.office.denic.de 4 2026-04-15 2026-08-19 nxdomain
w10409.office.denic.de 4 2026-04-15 2026-08-19 nxdomain
*.stage.denic.de 11 2026-04-23 2026-10-01 —
*.ha.qa2.stage.denic.de 6 2026-06-08 2026-10-01 —
*.ha.stage.denic.de 6 2026-06-08 2026-10-01 —
*.infra.stage.denic.de 6 2026-06-08 2026-10-01 —
mx01.list.stage.denic.de 7 2026-05-04 2026-08-31 nxdomain
*.fra1.be.dev.stage.denic.de 6 2026-04-10 2026-08-25 —
*.secure.denic.de 6 2026-06-08 2026-10-01 —
*.if.denic.de 6 2026-06-08 2026-10-01 —
rt-lte-1-ext.fra1.if.denic.de 3 2026-06-02 2026-08-11 nxdomain
rt-lte-1-ext.ams1.if.denic.de 3 2026-06-02 2026-08-11 nxdomain
rt-lte-1-ext.fra3.if.denic.de 5 2026-06-11 2026-08-11 nxdomain
training.denic.de 5 2026-05-01 2026-08-30 ok
blog.denic.de 5 2026-04-20 2026-08-21 ok
*.rri.denic.de 6 2026-06-08 2026-10-01 —
*.iscsi.denic.de 6 2026-06-08 2026-10-01 —
link.denic.de 4 2026-04-19 2026-09-18 ok
*.nsl.denic.de 6 2026-06-08 2026-10-01 —
de10.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.de10.nsl.denic.de 5 2026-05-19 2026-09-22 —
test-ext-1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.test-ext-1.nsl.denic.de 5 2026-05-19 2026-09-22 —
anx-jnb1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.anx-jnb1.nsl.denic.de 5 2026-05-19 2026-09-22 —
ae1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.ae1.nsl.denic.de 5 2026-05-19 2026-09-22 —
de1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.de1.nsl.denic.de 5 2026-05-19 2026-09-22 —
se1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.se1.nsl.denic.de 5 2026-05-19 2026-09-22 —
bg1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.bg1.nsl.denic.de 5 2026-05-19 2026-09-22 —
sg1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.sg1.nsl.denic.de 5 2026-05-19 2026-09-22 —
uk1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.uk1.nsl.denic.de 5 2026-05-19 2026-09-22 —
cl1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.cl1.nsl.denic.de 5 2026-05-19 2026-09-22 —
nl1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.nl1.nsl.denic.de 5 2026-05-19 2026-09-22 —
pl1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.pl1.nsl.denic.de 5 2026-05-19 2026-09-22 —
cn1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.cn1.nsl.denic.de 5 2026-05-19 2026-09-22 —
in1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.in1.nsl.denic.de 5 2026-05-19 2026-09-22 —
br1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.br1.nsl.denic.de 5 2026-05-19 2026-09-22 —
fr1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.fr1.nsl.denic.de 5 2026-05-19 2026-09-22 —
kr1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.kr1.nsl.denic.de 5 2026-05-19 2026-09-22 —
at1.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.at1.nsl.denic.de 5 2026-05-19 2026-09-22 —
mx1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.mx1.nsl.denic.de 5 2026-05-19 2026-09-22 —
anx-sydney1.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.anx-sydney1.nsl.denic.de 5 2026-05-19 2026-09-22 —
de2.nsl.denic.de 5 2026-05-19 2026-09-22 nodata
*.de2.nsl.denic.de 5 2026-05-19 2026-09-22 —
hk2.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.hk2.nsl.denic.de 5 2026-05-19 2026-09-22 —
anx-uk2.nsl.denic.de 5 2026-05-19 2026-09-22 ok
*.anx-uk2.nsl.denic.de 5 2026-05-19 2026-09-22 —

Showing the first 100 hostnames — sign in with GitHub or Google to page the full list, or use the API with an API key: GET /v1/hosts/denic.de.

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/denic.de.