code: public boolean checkIP(String ipstring)
      {
          Boolean ipconstrain = (Boolean) ips.get(ipstring);
          if (ipconstrain != null)
          {
              return ipconstrain.booleanValue();
          }
          else
          {
              return standard;
          }
      }
docs: Checks if the given ipstring (x.x.x.x) is authorized or not
  
  @param ipstring The ip-address as a String
  @return True if the IP is allowed access, otherwise false.