code: public static boolean isMulticastSupported(NetworkInterface pNif) {
          return pNif != null && checkMethod(pNif, isUp) && checkMethod(pNif, supportsMulticast);
      }
docs: Check whether the given interface supports multicast and is up
  
  @param pNif check whether the given interface supports multicast
  @return true if multicast is supported and the interface is up