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本帖最后由 jason680 于 2017-04-11 22:38 编辑
回复 1# yexingqi
$ ipcalc 192.168.0.0/22
Address: 192.168.0.0 11000000.10101000.000000 00.00000000
Netmask: 255.255.252.0 = 22 11111111.11111111.111111 00.00000000
Wildcard: 0.0.3.255 00000000.00000000.000000 11.11111111
=>
Network: 192.168.0.0/22 11000000.10101000.000000 00.00000000
HostMin: 192.168.0.1 11000000.10101000.000000 00.00000001
HostMax: 192.168.3.254 11000000.10101000.000000 11.11111110
Broadcast: 192.168.3.255 11000000.10101000.000000 11.11111111
Hosts/Net: 1022 Class C, Private Internet
$ echo 192.168.0.0/22 | awk '{cmd="ipcalc "$1; while(cmd|getline){if(/HostMin/)ips=$2;if(/HostMax/)ipe=$2};close(cmd);print ipe,ips}'
192.168.3.254 192.168.0.1
or boardcast ping
ping -c 1 -b 192.168.3.255
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