IP Address Subnet Mask calculation

IP Address Subnet mask calculation, return IP segment start and end range, length, mask and other information. /** * Mask Calculator * @author Weaksun <52132522@qq.com> * @param string $ip IP * @param Numeric $bits Mask * @return Array Returns the result set */ function netmask ($ip, $bits = 24) { $result = [ ' Start ' = + 0,//First IP ' End ' = 0,//Last IP ' Length ' = 0,//number of IPs included ' Netmask ' = (~pow (2, 32-$bits)) + 1,//subnet mask ' Networksegment ' = 0,//ip Duan ' Bcast ' = 0//broadcast address ]; $result [' length '] = ABS ($result [' netmask '])-2; $result [' networksegment '] = Ip2long ($IP) & $result [' netmask ']; $result [' start '] = $result [' networksegment '] + 1; $result [' end '] = $result [' networksegment '] + $result [' length ']; $result [' bcast '] = $result [' End '] + 1; return $result; } Copy Code List ($ip, $bits) = explode ('/', ' 192.168.1.5/25 '); $TMPARR = netmask ($ip, $bits); foreach ($tmpArr as $k = & $v) { $k! = ' length ' && $v = Long2ip ($v); } Echo ' ' . Var_export ($TMPARR, true). ' '; Copy Code Array ( ' Start ' = ' 192.168.1.1 ', ' End ' = ' 192.168.1.126 ', ' Length ' = 126, ' netmask ' = ' 255.255.255.128 ', ' Networksegment ' = ' 192.168.1.0 ', ' Bcast ' = ' 192.168.1.127 ', ) Copy Code

Subnet mask

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