I have a branch of 6.4.0 as of April 11, 2017 and I am running into an issue creating a system with an ip range from config wizard on centos6.
Distro: Centos 6
Steps for recreating:
1. Start configmgr
2. Generate a new environment using wizard
3. Input 10.239.20.30-33
4. Notice that the ip is recognized as just one node instead of 4.
This does not seem to be an issue on ubuntu 14.04