loadYOURSELF

Some domain’s serve under multiple ip addresses for example google.com

if you want to query this ip addresses then you can use this code block

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv) {
 if (argc < 2) {
   fprintf(stderr,"Usage: ./app www.google.com\n");
   exit(1);
 }

 struct hostent *hp = gethostbyname(argv[1]);

 if (hp == NULL) {
   fprintf(stderr,"query failed\n");
   exit(1);
 } else {
   unsigned int i=0;
   while ( hp -> h_addr_list[i] != NULL) {
     printf( "%d -> %s ",i, inet_ntoa( *( struct in_addr*)( hp -> h_addr_list[i])));
     i++;
   }
   exit(0);
 }
}

This entry gives a way to find active computers on a LAN with Linux machine.
We can use nmap port scanning tool for that.

You can install nmap with
yum install nmap
or
apt-get install nmap
Example:
nmap -sP 192.168.200.0/23

searches 192.168.200.x & 192.168.201.x sub networks. And lists active computers.

nmap -v -sP 192.168.200.0/23 gives more verbose.

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