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.

27 hosts · 364 ms

HostCertsFirst seenLast seenDNS
the360.me 11 2026-04-13 2026-08-20 ok
api.v2.the360.me 1 2026-08-19 2026-08-19 ok
dev.api.v2.the360.me 3 2026-07-27 2026-09-26 ok
api.the360.me 4 2026-04-21 2026-08-19 ok
staging.api.the360.me 6 2026-06-04 2026-08-04 ok
test.api.the360.me 4 2026-04-21 2026-08-19 ok
dev.api.the360.me 8 2026-05-22 2026-09-19 ok
event-portal.the360.me 1 2026-06-23 2026-06-23 ok
admin.the360.me 2 2026-02-24 2026-06-17 ok
staging.admin.the360.me 2 2026-04-05 2026-07-28 ok
dev.admin.the360.me 2 2026-02-25 2026-06-18 ok
test.nutrition.the360.me 5 2026-05-14 2026-09-12 ok
go.the360.me 6 2026-05-15 2026-09-30 ok
mcp.the360.me 3 2026-10-01 2026-10-02 ok
dev.plangenerator.the360.me 2 2026-08-25 2026-08-25 ok
staging.health-experts.the360.me 2 2026-04-05 2026-07-28 ok
mta-sts.the360.me 5 2026-05-29 2026-09-27 ok
www.hubspot.the360.me 8 2026-04-14 2026-08-11 ok
health-expert.the360.me 2 2026-02-24 2026-06-17 ok
waitlist.the360.me 8 2026-04-17 2026-06-15 ok
dev.nutritionist.the360.me 2 2026-02-24 2026-06-18 ok
whoop-dev.the360.me 2 2026-09-29 2026-09-29 ok
www.the360.me 5 2026-04-09 2026-06-07 ok
api.sndgofitz.the360.me 5 2026-04-22 2026-08-20 ok
staging.api.sndgofitz.the360.me 3 2026-06-04 2026-08-04 ok
test.api.sndgofitz.the360.me 5 2026-04-22 2026-08-20 ok
dev.api.sndgofitz.the360.me 3 2026-06-05 2026-08-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/the360.me (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/the360.me.