Summary: Ref T5833. This differentiates address spaces like the public internet from VPNs, so when a service is available at `192.168.0.1`, we'll know it's on some specific NAT block or whatever.
Test Plan: See screenshots.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T5833
Differential Revision: https://secure.phabricator.com/D10715
