It can be anything! An apex, subdomain, or even a URL.

Results forsvc.nsone.net

Domain Name	First seen	Still exists
api.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
connect.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
docker.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
image.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
nexus.tunnel.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
proxy.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
rabbitmq.tunnel.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
securenexus.tunnel.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
static.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
tunnel.prod.svc.nsone.net	2022-02-03T16:53:45.190Z
docker.dev.svc.nsone.net	2022-02-02T16:45:32.475Z
image.dev.svc.nsone.net	2022-02-02T16:45:32.475Z
static.dev.svc.nsone.net	2022-02-02T16:45:32.475Z
connect.dev.svc.nsone.net	2022-01-28T21:07:29.366Z
nexus.tunnel.dev.svc.nsone.net	2022-01-28T21:07:29.366Z
proxy.dev.svc.nsone.net	2022-01-28T21:07:29.366Z
rabbitmq.tunnel.dev.svc.nsone.net	2022-01-28T21:07:29.366Z
securenexus.tunnel.dev.svc.nsone.net	2022-01-28T21:07:29.366Z
tunnel.dev.svc.nsone.net	2022-01-28T21:07:29.366Z
api.dev.svc.nsone.net	2022-01-20T17:58:23.283Z