question: public static boolean isInRange ( String ip , String ipRange ) { if ( ip == null || ipRange == null ) return false ; String [ ] cidrString = ipRange . split ( "/" ) ; if ( cidrString . length == 0 ) return false ; String network = cidrString [ 0 ] ; String cidrMask = "24" ; if ( cidrString . length > 1 ) { cidrMask = cidrString [ 1 ] ; } String netMask = cidrMaskToNetMask ( cidrMask ) ; InetAddress maskedIP = applyMask ( ip , netMask ) ; InetAddress maskedNetwork = applyMask ( network , netMask ) ; if ( maskedIP == null || maskedNetwork == null ) return false ; return maskedIP . equals ( maskedNetwork ) ; }
target:  Tells whether the given IPV4 address is in the given CIDR ip range