gh-82836: fix private network check (GH-97733)

Fixes private checks for network objects. The previous method would incorrectly return True for a private check in cases such as "0.0.0.0/0".
(cherry picked from commit ed391090cc8332406e6225d40877db6ff44a7104)

Co-authored-by: Pete Wicken <2273100+JamoBox@users.noreply.github.com>