if (IPv6flag) {

            struct sockaddr_in6 sa6;

            sa6.sin6_family = AF_INET6;
            sa6.sin6_port = htons(atoi(service));
            inet_pton(AF_INET6, host, &(sa6.sin6_addr));

            if (UDPflag) {

                if ((getnameinfo(   (struct sockaddr *)&sa6, salen6,
                                host_buf, BUFF_SIZE, serv_buf, BUFF_SIZE,
                                NI_NAMEREQD | NI_DGRAM)) != 0)
                    error("getnameinfo");

                printf ("%s (%s) %s\n", host, host_buf, serv_buf);

            } else {
                if ((getnameinfo(   (struct sockaddr *)&sa6, salen6,
                                host_buf, BUFF_SIZE, serv_buf, BUFF_SIZE,
                                NI_NAMEREQD)) != 0)
                    error("getnameinfo");

                printf ("%s (%s) %s\n", host, host_buf, serv_buf);
            }
        }