code: public static boolean isIpAddressAllowed(String ipAddress, String... whitelist) {
  
  		if (StringUtils.isNullOrEmpty(ipAddress) || whitelist == null || whitelist.length == 0) {
  			return false;
  		}
  
  		for (String address : whitelist) {
  
  			if (ipAddress.equals(address)) {
  				return true;
  			}
  
  			if (address.contains("/")) { // is range definition
  
  				SubnetUtils utils = new SubnetUtils(address);
  				utils.setInclusiveHostCount(true);
  
  				if (utils.getInfo().isInRange(ipAddress)) {
  					return true;
  				}
  			}
  		}
  
  		return false;
  	}
docs: Compares ipAddress with one of the ip addresses listed
  
  @param ipAddress ip address to compare
  @param whitelist list of ip addresses ... an be a range ip ... in format 123.123.123.123/28 where last part is a subnet range
  @return true if allowed, false if not