obtener IP a partir de nombre de dominio

gethostbyname() es la funcion que debes usar...

De la ayuda de VS

//-
// Declare and initialize variables
hostent* remoteHost;
char* host_name;
unsigned int addr;

//-
// User inputs name of host
printf("Input name of host: ");
host_name = (char*) malloc(sizeof(char*)*16);
fgets(host_name, 16, stdin);

// If the user input is an alpha name for the host, use gethostbyname()
// If not, get host by addr (assume IPv4)
if (isalpha(host_name[0])) { /* host address is a name */
host_name[strlen(host_name)-1] = '\0'; /* NULL TERMINATED */
remoteHost = gethostbyname(host_name);
}
else {
addr = inet_addr(host_name);
remoteHost = gethostbyaddr((char *)&addr, 4, AF_INET);
}

if (WSAGetLastError() != 0) {
if (WSAGetLastError() == 11001)
printf("Host not found...Exiting.");
}
else
printf("error#:%ld", WSAGetLastError());

// The remoteHost structure can now be used to
// access information about the host



Un saludo
Rodrigo Corral González [MVP]

FAQ de microsoft.public.es.vc++
http://rcorral.mvps.org