SubnetUtil

/*
Description: A function to check if a specified IP is a member of one of the IP Networks in the cmdb_ci_ip_network table.
var su = new SubnetUtil();
su.<doSomething>
*/
var SubnetUtil = Class.create();

SubnetUtil.prototype = {
  initialize : function() {
  },

  IPnumber: function(IPaddress) {
      var ip = IPaddress.match(/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/);
      if(ip) {
         return (+ip[1]<<24) + (+ip[2]<<16) + (+ip[3]<<8) + (+ip[4]);
      }
      return null;
   },

   IPmask: function(maskSize) {
      return -1<<(32-maskSize);
   },

   inSubnet: function(IPaddress){
      var matchedNetwork = '';
      var networks = new GlideRecord('cmdb_ci_ip_network');
      networks.query();
      while(networks.next()) {
         if((this.IPnumber(IPaddress) & this.IPmask(networks.subnet.split('/')[1])) == this.IPnumber(networks.subnet.split('/')[0])){
            matchedNetwork = networks.sys_id + '';
         }
      }
      if(matchedNetwork) {
         return matchedNetwork;
      }else{
         return null;
      }
   }
}