--- Socket.gethostbyaddr(host[, type])

    sockaddr ¤Τѥåʸ󤫤ۥȾ֤ޤ
    ۥȾι¤ Socket.gethostbynameƱǤ
    type ˤϡɥ쥹(ǥեȤ 
    Socket::AF_INET)ꤷޤ

