IP Subnets for Internal Use
Calculators:
- http://www.subnet-calculator.com/subnet.php?net_class=A
- https://www.calculator.net/ip-subnet-calculator.html
- http://jodies.de/ipcalc?host=10.0.4.1&mask1=8&mask2=10.0.4.0
- https://support.microsoft.com/en-us/help/164015/understanding-tcp-ip-addressing-and-subnetting-basics
- https://en.wikipedia.org/wiki/Private_network
# These networks are considered "internal"
allow 127.0.0.0/8;
allow 10.0.0.0/8;
allow 192.168.0.0/16;
allow 172.16.0.0/12;
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