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.

71 hosts · 1083 ms

HostCertsFirst seenLast seenDNS
gmo-pg.com 1 2025-11-17 2025-11-17 nodata
backstage-gen2.gmo-pg.com 2 2025-11-20 2025-12-05 ok
*.backstage-gen2.gmo-pg.com 1 2025-12-05 2025-12-05 —
github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
media.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
codeload.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
npm.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
viewscreen.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
maven.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
docker.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
uploads.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
pages.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
notebooks.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
rubygems.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
avatars.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
containers.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
assets.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
nuget.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
gist.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
raw.stg-github.backstage-gen2.gmo-pg.com 3 2026-07-13 2026-09-18 ok
media.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
codeload.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
slack.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
npm.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
viewscreen.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
maven.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
docker.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
uploads.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
pages.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
notebooks.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
teams.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
rubygems.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
avatars.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
containers.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
assets.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
nuget.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
gist.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
raw.github.backstage-gen2.gmo-pg.com 11 2026-05-01 2026-10-01 ok
atlas-poc.backstage-gen2.gmo-pg.com 6 2026-07-17 2026-08-20 nodata
stg-redmine.backstage-gen2.gmo-pg.com 2 2025-07-01 2026-06-01 nxdomain
stg.backstage-gen2.gmo-pg.com 1 2025-12-22 2025-12-22 ok
stg-redmine-monkan.backstage-gen2.gmo-pg.com 2 2025-07-01 2026-06-01 ok
aws-vpn.backstage-gen2.gmo-pg.com 1 2025-12-21 2025-12-21 nxdomain
dify.backstage-gen2.gmo-pg.com 2 2025-07-31 2026-07-01 ok
stg-dify.backstage-gen2.gmo-pg.com 1 2026-05-07 2026-05-07 ok
mp-faq2.gmo-pg.com 5 2026-09-17 2026-09-30 nxdomain
taxrefund.gmo-pg.com 7 2025-09-30 2026-09-17 ok
j-taxrefund.gmo-pg.com 5 2025-10-17 2026-09-17 nodata
*.j-taxrefund.gmo-pg.com 7 2025-10-03 2026-09-17 —
*.taxrefund.gmo-pg.com 13 2025-09-30 2026-09-17 —
knowledge.gmo-pg.com 12 2026-04-29 2026-08-25 ok
search.gmo-pg.com 2 2026-03-03 2026-03-05 ok
it-helpdesk.gmo-pg.com 20 2026-04-15 2026-09-03 ok
corp.gmo-pg.com 1 2025-11-17 2025-11-17 ok
test-corp.gmo-pg.com 2 2025-09-01 2026-10-02 ok
mp-faq.gmo-pg.com 1 2026-02-18 2026-02-18 ok
pgcas.gmo-pg.com 2 2025-09-08 2026-09-29 ok
docs.gmo-pg.com 1 2026-01-30 2026-01-30 ok
stg.docs.gmo-pg.com 1 2026-01-30 2026-01-30 ok
dev.docs.gmo-pg.com 1 2026-01-30 2026-01-30 ok
contents.gmo-pg.com 20 2026-04-29 2026-08-25 ok
contact.gmo-pg.com 1 2026-06-05 2026-06-05 ok
status-merchant.gmo-pg.com 5 2026-05-03 2026-08-29 ok
kokuzei-sp-noufu.gmo-pg.com 3 2025-08-19 2026-08-31 ok
stg.kokuzei-sp-noufu.gmo-pg.com 3 2025-08-19 2026-08-31 ok
corp-appgw.gmo-pg.com 1 2026-03-11 2026-03-11 ok
test-corp-appgw.gmo-pg.com 1 2026-09-01 2026-09-01 —
nsgw.gmo-pg.com 2 2026-01-22 2026-04-13 ok
www.gmo-pg.com 1 2025-11-17 2025-11-17 ok
invoice-card-pay.gmo-pg.com 1 2026-01-22 2026-01-22 ok

Programmatic access, with DNS A records: API GET /v1/hosts/gmo-pg.com (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/gmo-pg.com.