getaddrinfo.cpp

int status;
struct addrinfo hints;
struct addrinfo *servinfo;  // will point to the results

memset(&hints, 0, sizeof hints); // make sure the struct is empty
hints.ai_family = AF_INET6;      // IPv6
hints.ai_socktype = SOCK_STREAM; // TCP stream sockets
hints.ai_flags = AI_PASSIVE;     // fill in my IP for me

getaddrinfo("www.google.com", "https", &hints, &servinfo);

struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)servinfo->ai_addr;
void *addr = &(ipv6->sin6_addr);
char ipstr[INET6_ADDRSTRLEN];

inet_ntop(servinfo->ai_family, addr, ipstr, sizeof ipstr);
printf("IP: %s\n", ipstr);