// Programa resolv-ip.c

#include <stdio.h>
#include <netdb.h>

extern int    errno;

int main()
  {
  unsigned char      bytesIP[4];  /* alocacao de 4 bytes para endereco IP */
  struct hostent    * hostentp;

  printf("Entre com o endeco IP do host: "); 
  scanf("%d.%d.%d.%d",
		  &bytesIP[0],&bytesIP[1],&bytesIP[2],&bytesIP[3]);
  printf("Endereco IP: %u.%u.%u.%u \n",
		  bytesIP[0],
		  bytesIP[1],
		  bytesIP[2],
		  bytesIP[3]);
  hostentp = gethostbyaddr(bytesIP,4,AF_INET); 
  if (hostentp == NULL) /* Erro */
     perror("Erro na chamada gethostbyname()");    
  else /* ok */
    {
    printf("Nome = %s \n", hostentp->h_name);
    }
  }