bool isIPV6Net(const std::string ip_v4, std::string& out_ip)

{

    bool is_v6 = false;

    struct addrinfo* res0;

    struct addrinfo hints;

    struct addrinfo* res;

    memset(&hints, , sizeof(hints));

    hints.ai_flags = ;

    hints.ai_family = PF_UNSPEC;

    hints.ai_socktype = SOCK_STREAM;

    int n = ;

    if((n=getaddrinfo(ip_v4.c_str(), "http", &hints, &res0))!=)

    {

        printf("getaddrinfo error: %s\n",gai_strerror(n));

        return false;

    }

    struct sockaddr_in6* addr6;

    struct sockaddr_in* addr;

    char ipbuf[] = {'\0'};

    for(res = res0; res; res = res->ai_next)

    {

        if(res->ai_family == AF_INET6)

        {

            addr6 =( struct sockaddr_in6*)res->ai_addr;

            inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, sizeof(ipbuf));

            is_v6 = true;

        }

        else

        {

            addr =( struct sockaddr_in*)res->ai_addr;

            inet_ntop(AF_INET, &addr->sin_addr, ipbuf, sizeof(ipbuf));

        }

        break;

    }

    out_ip = ipbuf;

    return is_v6;

}

char ipv4[] = {, , , };

char ipv4_str_buf[INET_ADDRSTRLEN] = {  };

const char *ipv4_str = inet_ntop(AF_INET, &ipv4, ipv4_str_buf, sizeof(ipv4_str_buf));

std::string out_ip;

bool is = isIPV6Net("64:ff9b::739f:62d", out_ip);