Allow multiple IPs/Subnets ranges when creating Network Route

[ralph-exsyn]

Is your feature request related to a problem? Please describe.
A client uses 6 different IPs: xx.xxx.84:89.xxx for which I did not want to setup 6 different network routes, for ease of management. Temporarily created a single subnet route xx.xxx.0.0/16, potentially blocking many ranges in the future.

Describe the solution you'd like
A functionality to allow multiple IPs/Subnets in the range when creating a new Network Route as such:

Describe alternatives you've considered
Creating 6 different network routes.

Kind regards,
Ralph

[ralph-exsyn]

Note: I believe that #2852 could be a possible solution for this as well.