说明:calc.py
测试1
$ python calc.py 192.168.1.10/30
ip=192.168.1.10 len=30
network mask: 0xFFFFFFFC (11111111.11111111.11111111.11111100) 255.255.255.252
host mask: 0x00000003 (00000000.00000000.00000000.00000011)
network part: 0xC0A80108 (192.168.1.8)
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