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.

45 hosts · 347 ms

HostCertsFirst seenLast seenDNS
one.app 47 2026-05-09 2026-10-02 ok
*.one.app 31 2026-05-09 2026-09-22 —
test-support-2.one.app 5 2026-05-07 2026-09-04 ok
auth-m2m-stg.ac.one.app 2 2026-02-22 2026-07-10 ok
auth-m2m.ac.one.app 2 2026-02-22 2026-07-10 ok
auth-m2m-dev.ac.one.app 1 2026-01-28 2026-01-28 ok
one-file-upload.one.app 3 2026-05-23 2026-08-07 ok
device.one.app 3 2025-09-15 2026-10-03 ok
update.one.app 8 2026-05-09 2026-09-04 nodata
*.update.one.app 8 2026-05-09 2026-09-04 —
ablink.update.one.app 3 2026-05-22 2026-08-06 ok
abmail.update.one.app 8 2026-05-09 2026-09-04 nodata
*.abmail.update.one.app 8 2026-05-09 2026-09-04 —
stirring-mochi-staging.one.app 5 2026-05-15 2026-09-12 ok
api.analytics-stirring-mochi-staging.one.app 2 2025-08-13 2026-07-14 ok
evs.analytics-stirring-mochi-staging.one.app 2 2025-08-13 2026-07-14 ok
files-staging.one.app 5 2026-04-23 2026-09-22 ok
api.one.app 11 2026-06-06 2026-10-02 ok
hack.one.app 1 2026-04-15 2026-04-15 nxdomain
*.hack.one.app 1 2026-04-15 2026-04-15 —
support-portal.one.app 5 2026-05-15 2026-09-12 ok
wm.one.app 10 2026-06-06 2026-10-02 nodata
*.wm.one.app 10 2026-06-06 2026-10-02 —
*.abmail.wm.one.app 10 2026-06-06 2026-10-02 —
hello.one.app 3 2026-06-19 2026-09-03 ok
api-stage.vgs.one.app 3 2026-05-28 2026-08-06 ok
cards-staging.vgs.one.app 3 2026-05-26 2026-08-04 ok
wallet-staging.vgs.one.app 5 2026-04-28 2026-09-15 ok
api.vgs.one.app 5 2026-06-06 2026-08-16 ok
cards.vgs.one.app 3 2026-05-26 2026-08-04 ok
one-net-tokens.vgs.one.app 5 2026-04-24 2026-09-11 ok
staging-one-net-tokens.vgs.one.app 5 2026-04-29 2026-09-16 ok
dev-one-net-tokens.vgs.one.app 5 2026-04-23 2026-09-10 ok
wallet.vgs.one.app 5 2026-04-23 2026-09-10 ok
wallet-dev.vgs.one.app 5 2026-04-23 2026-09-10 ok
one-net-tokens.one.app 4 2026-04-20 2026-09-09 ok
dev-one-net-tokens.one.app 4 2026-04-19 2026-09-06 ok
status.one.app 5 2026-05-02 2026-08-28 ok
account.one.app 8 2026-05-09 2026-09-04 nodata
*.account.one.app 8 2026-05-09 2026-09-04 —
ablink.account.one.app 4 2026-05-10 2026-07-25 ok
abmail.account.one.app 8 2026-05-09 2026-09-04 nodata
*.abmail.account.one.app 8 2026-05-09 2026-09-04 —
*.review.one.app 2 2025-06-12 2026-05-13 —
www.one.app 6 2026-05-15 2026-09-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/one.app (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/one.app.