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.

100 hosts (first page) · 180 ms

HostCertsFirst seenLast seen
jcom.co.jp 1 2026-05-27 2026-05-27
*.jcom.co.jp 1 2026-05-27 2026-05-27
member-uat1.jcom.co.jp 1 2026-02-20 2026-02-20
jgais-oshiete-tech-test1.jcom.co.jp 1 2026-02-13 2026-02-13
toolorder2.jcom.co.jp 1 2026-02-18 2026-02-18
member-uat2.jcom.co.jp 1 2026-02-20 2026-02-20
jgais-oshiete-tech-test2.jcom.co.jp 1 2026-02-13 2026-02-13
web.jcom.co.jp 1 2025-09-29 2025-09-29
*.web.jcom.co.jp 1 2025-09-29 2025-09-29
dev2-jpb.jcom.co.jp 1 2026-02-16 2026-02-16
www.dev2-jpb.jcom.co.jp 1 2026-02-16 2026-02-16
dev3-jpb.jcom.co.jp 1 2026-06-22 2026-06-22
www.dev3-jpb.jcom.co.jp 1 2026-06-22 2026-06-22
dev4-jpb.jcom.co.jp 1 2026-06-22 2026-06-22
www.dev4-jpb.jcom.co.jp 1 2026-06-22 2026-06-22
pro-jpb.jcom.co.jp 1 2026-02-16 2026-02-16
www.pro-jpb.jcom.co.jp 1 2026-02-16 2026-02-16
dev-jpb.jcom.co.jp 1 2026-02-16 2026-02-16
www.dev-jpb.jcom.co.jp 1 2026-02-16 2026-02-16
jgais-oshiete-tech-bnd-inc.jcom.co.jp 4 2026-02-11 2026-09-26
jgais-oshiete-tech-ncod-inc.jcom.co.jp 2 2026-02-23 2026-06-15
nocidist1.noc.jcom.co.jp 1 2026-02-19 2026-02-19
jgais-oshiete-tech-safe.jcom.co.jp 1 2026-02-22 2026-02-22
sharelife.jcom.co.jp 3 2026-05-10 2026-08-29
linkage.jcom.co.jp 1 2025-07-25 2025-07-25
*.linkage.jcom.co.jp 1 2025-07-25 2025-07-25
jcom-receive.linkage.jcom.co.jp 1 2025-07-25 2025-07-25
auth.linkage.jcom.co.jp 2 2025-07-24 2026-06-24
jcom-api.linkage.jcom.co.jp 1 2025-07-25 2025-07-25
ckan.linkage.jcom.co.jp 1 2025-07-25 2025-07-25
fiware-app.linkage.jcom.co.jp 2 2025-07-25 2025-07-25
mng-app.linkage.jcom.co.jp 1 2025-07-25 2025-07-25
iot-mng-app.linkage.jcom.co.jp 1 2025-07-28 2025-07-28
*.iot-mng-app.linkage.jcom.co.jp 1 2025-07-28 2025-07-28
*.mng-app.linkage.jcom.co.jp 1 2025-07-25 2025-07-25
mypage.jcom.co.jp 1 2026-03-04 2026-03-04
jgais-oshiete-tech-rule.jcom.co.jp 2 2026-02-19 2026-06-11
*.jcomhome.jcom.co.jp 2 2025-07-24 2026-06-22
*.stg.jcomhome.jcom.co.jp 2 2025-07-24 2026-06-22
*.dev.jcomhome.jcom.co.jp 2 2025-07-17 2026-06-15
telemedicine.jcom.co.jp 3 2025-07-07 2026-07-27
note.jcom.co.jp 3 2026-04-20 2026-08-12
cloud.cj.jcom.co.jp 1 2025-11-05 2025-11-05
image.cj.jcom.co.jp 3 2025-12-29 2026-09-02
click.cj.jcom.co.jp 1 2025-11-05 2025-11-05
view.cj.jcom.co.jp 1 2025-11-05 2025-11-05
on-lineroom.jcom.co.jp 2 2025-12-10 2025-12-10
test.on-lineroom.jcom.co.jp 2 2025-12-10 2025-12-10
sgtm.jcom.co.jp 4 2026-04-13 2026-09-23
dev2.jcomnextgen.jcom.co.jp 2 2026-03-17 2026-08-25
www.dev2.jcomnextgen.jcom.co.jp 2 2026-03-17 2026-08-25
prd.jcomnextgen.jcom.co.jp 1 2026-05-19 2026-05-19
www.prd.jcomnextgen.jcom.co.jp 1 2026-05-19 2026-05-19
prd-ext.jcomnextgen.jcom.co.jp 1 2026-01-27 2026-01-27
dev-ext.jcomnextgen.jcom.co.jp 1 2026-01-27 2026-01-27
dev.jcomnextgen.jcom.co.jp 1 2026-05-19 2026-05-19
www.dev.jcomnextgen.jcom.co.jp 1 2026-05-19 2026-05-19
dev2-jpb-in.jcom.co.jp 1 2026-02-16 2026-02-16
www.dev2-jpb-in.jcom.co.jp 1 2026-02-16 2026-02-16
dev3-jpb-in.jcom.co.jp 1 2026-06-22 2026-06-22
www.dev3-jpb-in.jcom.co.jp 1 2026-06-22 2026-06-22
dev4-jpb-in.jcom.co.jp 1 2026-06-22 2026-06-22
www.dev4-jpb-in.jcom.co.jp 1 2026-06-22 2026-06-22
pro-jpb-in.jcom.co.jp 1 2026-02-16 2026-02-16
www.pro-jpb-in.jcom.co.jp 1 2026-02-16 2026-02-16
dev-jpb-in.jcom.co.jp 1 2026-02-16 2026-02-16
www.dev-jpb-in.jcom.co.jp 1 2026-02-16 2026-02-16
authlogin.jcom.co.jp 1 2026-06-08 2026-06-08
introduction.jcom.co.jp 1 2025-11-17 2025-11-17
cotton.jcom.co.jp 2 2026-04-06 2026-09-18
www.cotton.jcom.co.jp 2 2026-04-06 2026-09-30
sn.jcom.co.jp 5 2026-04-29 2026-08-27
dev2.sn.jcom.co.jp 5 2026-05-31 2026-09-28
ver.sn.jcom.co.jp 5 2026-04-30 2026-08-28
dev.sn.jcom.co.jp 5 2026-06-05 2026-10-03
bos3-pro.jcom.co.jp 1 2026-02-20 2026-02-20
jpad-pro.jcom.co.jp 1 2026-02-20 2026-02-20
jpaddl-pro.jcom.co.jp 1 2026-02-20 2026-02-20
jfact-pro.jcom.co.jp 3 2025-09-10 2026-09-17
odp.jcom.co.jp 1 2026-05-07 2026-05-07
jgais-oshiete-doc-faq.jcom.co.jp 3 2026-02-23 2026-10-09
jgais-oshiete-talent-faq.jcom.co.jp 2 2026-02-23 2026-06-16
jgais-oshiete-procu-faq.jcom.co.jp 4 2026-02-20 2026-10-07
jgais-oshiete-tv-gyoumu-faq.jcom.co.jp 1 2026-07-22 2026-07-22
www.member.jcom.co.jp 1 2026-02-20 2026-02-20
jcom-ssi-order.jcom.co.jp 3 2025-09-08 2026-10-06
ttc.jupiter.jcom.co.jp 2 2025-08-20 2026-08-17
mnt-kmdcs.jcom.co.jp 1 2026-01-23 2026-01-23
jgais.jcom.co.jp 3 2026-02-14 2026-09-28
subs.jsis.jcom.co.jp 1 2025-12-17 2025-12-17
mkt.business.jcom.co.jp 2 2025-07-01 2026-06-01
cloudpbx.business.jcom.co.jp 1 2026-09-01 2026-09-01
*.cloudpbx.business.jcom.co.jp 1 2026-09-01 2026-09-01
cloud-pbx01.cloudpbx.business.jcom.co.jp 1 2026-09-01 2026-09-01
www.cloud-pbx01.cloudpbx.business.jcom.co.jp 1 2026-09-01 2026-09-01
stg.cloudpbx.business.jcom.co.jp 1 2026-09-01 2026-09-01
*.stg.cloudpbx.business.jcom.co.jp 1 2026-09-01 2026-09-01
cloud-pbx01.stg.cloudpbx.business.jcom.co.jp 1 2026-09-01 2026-09-01
www.cloud-pbx01.stg.cloudpbx.business.jcom.co.jp 1 2026-09-01 2026-09-01
member-uat.jcom.co.jp 1 2026-02-20 2026-02-20

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/jcom.co.jp.

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/jcom.co.jp.