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) · 474 ms

HostCertsFirst seenLast seenDNS
ionos.com 6 2025-08-05 2026-09-23 ok
*.ionos.com 2 2025-08-05 2026-07-07 —
mx00.ionos.com 1 2026-02-03 2026-02-03 ok
ftp-fra-1.ionos.com 1 2026-07-01 2026-07-01 ok
www.ftp-fra-1.ionos.com 1 2026-07-01 2026-07-01 nxdomain
mx01.ionos.com 1 2026-02-03 2026-02-03 ok
abu-mx01.ionos.com 5 2026-05-28 2026-09-25 ok
ftp-fre1.ionos.com 2 2026-04-29 2026-06-12 ok
www.ftp-fre1.ionos.com 1 2026-04-29 2026-04-29 nxdomain
ftp-mci1.ionos.com 1 2026-05-19 2026-05-19 nxdomain
ftp-par1.ionos.com 1 2026-05-19 2026-05-19 nxdomain
myw1.ionos.com 4 2026-04-12 2026-09-24 ok
ftp-bhx1.ionos.com 1 2025-11-05 2025-11-05 nxdomain
ftp-fra-2.ionos.com 1 2026-06-12 2026-06-12 ok
abu-mx02.ionos.com 5 2026-05-28 2026-09-25 ok
*.infra-uc.de-stg2.ionos.com 5 2026-06-05 2026-10-03 —
loki.infra-uc.de-stg2.ionos.com 4 2026-06-05 2026-10-03 ok
tp.infra-uc.de-stg2.ionos.com 4 2026-06-05 2026-10-03 ok
*.tp.infra-uc.de-stg2.ionos.com 4 2026-06-05 2026-10-03 —
vmalertmanager.infra-uc.de-stg2.ionos.com 4 2026-06-05 2026-10-03 ok
harbor.infra-uc.de-stg2.ionos.com 4 2026-06-05 2026-10-03 ok
vm-access.infra-uc.de-stg2.ionos.com 4 2026-06-05 2026-10-03 ok
vault.infra-uc.de-stg2.ionos.com 4 2026-06-05 2026-10-03 ok
paas-tunnel.de-stg2.ionos.com 1 2026-07-06 2026-07-06 nodata
*.paas-tunnel.de-stg2.ionos.com 1 2026-07-06 2026-07-06 —
ftp-mci2.ionos.com 1 2026-05-19 2026-05-19 nxdomain
ftp-par2.ionos.com 1 2026-05-19 2026-05-19 nxdomain
myw2.ionos.com 4 2026-04-12 2026-09-24 ok
ftp-bhx2.ionos.com 1 2025-11-05 2025-11-05 nxdomain
s3.ionos.com 1 2026-03-11 2026-03-11 ok
www.s3.ionos.com 1 2026-03-11 2026-03-11 nxdomain
myw3.ionos.com 4 2026-04-13 2026-09-26 ok
myw4.ionos.com 4 2026-04-13 2026-09-26 ok
myw5.ionos.com 4 2026-04-12 2026-09-24 ok
myw6.ionos.com 4 2026-04-13 2026-09-26 ok
exchange2019.ionos.com 2 2025-09-10 2026-08-25 ok
smtpin-ga.exchange2019.ionos.com 2 2025-09-10 2026-08-25 ok
smtpin-lxa.exchange2019.ionos.com 2 2025-09-10 2026-08-25 ok
xadmin.exchange2019.ionos.com 2 2025-09-02 2026-08-19 ok
smtp.exchange2019.ionos.com 2 2025-09-10 2026-08-25 ok
autodiscover.exchange2019.ionos.com 2 2025-09-10 2026-08-25 ok
downloads.exchange2019.ionos.com 2 2025-09-10 2026-08-25 ok
aia.ionos.com 1 2026-06-05 2026-06-05 ok
www.aia.ionos.com 1 2026-06-05 2026-06-05 nxdomain
*.de-fra.ionos.com 2 2025-09-11 2026-08-28 —
s3.de-fra.ionos.com 4 2026-05-10 2026-07-09 ok
dev.s3.de-fra.ionos.com 5 2026-07-20 2026-09-18 ok
kafka.de-fra.ionos.com 7 2026-05-10 2026-09-19 ok
qa.kafka.de-fra.ionos.com 9 2026-05-09 2026-09-18 ok
pre.kafka.de-fra.ionos.com 7 2026-05-09 2026-09-19 ok
dev.kafka.de-fra.ionos.com 10 2026-04-15 2026-09-18 ok
*.infra.de-fra.ionos.com 5 2026-05-31 2026-09-28 —
argocd.infra.de-fra.ionos.com 5 2026-05-02 2026-08-30 ok
tp-vnf.infra.de-fra.ionos.com 4 2026-04-20 2026-08-18 ok
*.tp-vnf.infra.de-fra.ionos.com 4 2026-04-20 2026-08-18 —
*.zdi.infra.de-fra.ionos.com 5 2026-04-26 2026-08-26 —
loki.zdi.infra.de-fra.ionos.com 5 2026-04-26 2026-08-26 ok
keycloak.zdi.infra.de-fra.ionos.com 5 2026-04-26 2026-08-26 ok
tp.zdi.infra.de-fra.ionos.com 7 2026-06-01 2026-09-29 ok
*.tp.zdi.infra.de-fra.ionos.com 7 2026-06-01 2026-09-29 —
harbor.zdi.infra.de-fra.ionos.com 5 2026-04-26 2026-08-26 ok
vm-access.zdi.infra.de-fra.ionos.com 5 2026-04-26 2026-08-26 ok
vault.zdi.infra.de-fra.ionos.com 5 2026-04-26 2026-08-26 ok
loki.infra.de-fra.ionos.com 5 2026-05-06 2026-09-03 ok
tp.infra.de-fra.ionos.com 4 2026-04-20 2026-08-18 ok
*.tp.infra.de-fra.ionos.com 4 2026-04-20 2026-08-18 —
vmalertmanager.infra.de-fra.ionos.com 5 2026-04-22 2026-08-20 ok
harbor.infra.de-fra.ionos.com 5 2026-05-06 2026-09-03 ok
tp-dbaas.infra.de-fra.ionos.com 5 2026-05-29 2026-09-26 ok
*.tp-dbaas.infra.de-fra.ionos.com 5 2026-05-29 2026-09-26 —
vm-access.infra.de-fra.ionos.com 5 2026-05-06 2026-09-03 ok
vault.infra.de-fra.ionos.com 5 2026-05-16 2026-09-13 ok
in-memory-db.de-fra.ionos.com 8 2026-04-14 2026-10-06 ok
9656120e-b828-4cb6-8da5-45e3352c1200.in-memory-db.de-fra.ionos.com 2 2026-04-29 2026-04-29 nxdomain
d75add3f-e466-4a54-be1f-4951914e4c00.in-memory-db.de-fra.ionos.com 2 2026-05-12 2026-05-12 nxdomain
ad6e699f-aa15-4264-a013-2091bb84f220.in-memory-db.de-fra.ionos.com 2 2026-06-17 2026-06-17 ok
a52e255a-4b58-46eb-8174-114f86bd5720.in-memory-db.de-fra.ionos.com 2 2026-05-03 2026-05-03 nxdomain
84266b81-961e-41b1-a6b5-f02b69f92030.in-memory-db.de-fra.ionos.com 1 2026-04-20 2026-04-20 nxdomain
88b754f7-809f-4b92-ac6d-fcd15b860e50.in-memory-db.de-fra.ionos.com 5 2026-04-27 2026-08-25 ok
caf01efb-466a-4d57-a2a2-4d2f608035b0.in-memory-db.de-fra.ionos.com 2 2026-04-30 2026-04-30 nxdomain
e79a9fe5-7d68-4c42-9958-de0c56318ae0.in-memory-db.de-fra.ionos.com 2 2026-05-01 2026-05-01 nxdomain
c239646f-f0ad-40b9-ab52-0b222eaf8031.in-memory-db.de-fra.ionos.com 2 2026-04-28 2026-04-28 nxdomain
c7a09976-89c2-4f6d-a1a0-06371a871931.in-memory-db.de-fra.ionos.com 2 2026-05-01 2026-05-01 nxdomain
8845748b-3100-4a51-be74-7ab6e9654e31.in-memory-db.de-fra.ionos.com 2 2026-06-15 2026-06-15 ok
7d4e4a81-2d0b-4b97-848f-0bbd1f54d051.in-memory-db.de-fra.ionos.com 3 2026-06-05 2026-08-04 ok
2dd99a9f-3e4f-40b8-914c-d33560499371.in-memory-db.de-fra.ionos.com 4 2026-04-18 2026-08-16 ok
4791a15d-6c39-4f11-a2db-c06b37443e71.in-memory-db.de-fra.ionos.com 1 2026-04-20 2026-04-20 nxdomain
5f70e656-b821-470a-a74a-1330aa4ef591.in-memory-db.de-fra.ionos.com 4 2026-05-19 2026-07-18 ok
778afa08-1a94-4f6a-843c-1130f5f790a1.in-memory-db.de-fra.ionos.com 1 2026-04-17 2026-04-17 nxdomain
33e9ef0a-afde-44ee-9d83-15cd0ac2d3c1.in-memory-db.de-fra.ionos.com 1 2026-04-17 2026-04-17 nxdomain
d9ff42d8-cbaa-4900-bf61-c22de0b54fd1.in-memory-db.de-fra.ionos.com 2 2026-05-03 2026-05-03 nxdomain
470cd4e3-fc00-43fb-b6e7-bab4e9ef5cf1.in-memory-db.de-fra.ionos.com 2 2026-05-01 2026-05-01 nxdomain
a097f650-d693-428b-9afc-4fd7594b7762.in-memory-db.de-fra.ionos.com 2 2026-04-22 2026-04-22 nxdomain
da978a12-6032-4f2d-bb50-368782103c72.in-memory-db.de-fra.ionos.com 2 2026-05-10 2026-05-10 nxdomain
967c930e-fd9f-5ad3-a2a5-f1b58122d982.in-memory-db.de-fra.ionos.com 5 2026-05-11 2026-09-08 ok
a3eb312d-7edf-59fb-8050-60197dada7c2.in-memory-db.de-fra.ionos.com 2 2026-04-28 2026-04-28 nxdomain
d16e5e7d-fc46-4719-af7d-3f8be570e313.in-memory-db.de-fra.ionos.com 2 2026-05-12 2026-05-12 nxdomain
553b9c38-98a1-452e-a22d-97c66e4ecb13.in-memory-db.de-fra.ionos.com 2 2026-05-11 2026-05-11 nxdomain
161c08c3-67ba-4b96-afbb-be627cf09333.in-memory-db.de-fra.ionos.com 2 2026-04-28 2026-04-28 nxdomain
e334f67b-14af-4cbc-8ed8-fdf17d359e63.in-memory-db.de-fra.ionos.com 2 2026-06-09 2026-06-09 ok

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/ionos.com.

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/ionos.com.