#include <netdb.h>

/* Chris Alfeld */
/* A program to change a IP address to a host name */

main(int argc,char **argv)
{
	char a[4]; /* addr */
	int d[4];
	struct hostent *h;
	if ( argc != 2 ) exit(1);

	sscanf(argv[1],"%d.%d.%d.%d",&d[0],&d[1],&d[2],&d[3]);
	a[0]=d[0];a[1]=d[1];a[2]=d[2];a[3]=d[3];	

	h=gethostbyaddr(a,4,2);
	if ( h != 0 ) printf("%s",h->h_name);
}