ccarls02/subnet-info

will return subnet info for an ip/cidr or for the subnet two ips belong to

subnet-info

will return subnet info for an ip/cidr or for the subnet two ips belong to

Usage:

./subnet.pl <ip_address/cidr>

   This will return all subnet info

./subnet.pl <ip_address> <ip_address>

   This will compare the IPs, show what subnet they belong to
    and print all info about the subnet

./subnet.pl explain <ip_address/cidr>

    This will return all subnet info and
     will also print calculation information

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

ccarls02$ ./subnet.pl 144.230.82.244/28

   /28 Subnet Mask: 255.255.255.240
     Wildcard Mask: 0.0.0.15

        Entered IP: 144.230.82.244/28

            Subnet: 144.230.82.240

      Subnet Range: 144.230.82.241 -
                    144.230.82.254

    Broadcast Addy: 144.230.82.255

 Next Network Addy: 144.230.83.0

        Usable IPs: 16 - 2

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

ccarls02$ ./subnet.pl explain 144.230.82.244/28

   /28 Subnet Mask: 255.255.255.240
     Wildcard Mask: 0.0.0.15

        Entered IP: 144.230.82.244/28

            Subnet: 144.230.82.240

      Subnet Range: 144.230.82.241 -
                    144.230.82.254

    Broadcast Addy: 144.230.82.255

 Next Network Addy: 144.230.83.0

        Usable IPs: 16 - 2



        -------------------------------------------
        Explanation:

               IP: 144.230.82.244   SUBNET: 28

                                               network <-|-> hosts
               Binary IP: 10010000.11100110.01010010.1111|0100

                Active Octet: 4th
                Active CIDR : 4 bit(s) of this octet are NETWORK

                Active Octet binary: 1111|0100
                                        ↑
                           Blocksize Bit|

               Blocksize bit value: 16
                 (Increment blocksize bit for next network address)

               for /28 =>
                  Network bits:  28     2^28 = 268,435,456 networks
                     Host bits:   4  (2^4)-2 = 16 - 2 hosts
        -------------------------------------------


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


ccarls02$ ./subnet.pl 144.230.82.244 144.230.82.242

                                     --><--
   IP1: 10010000.11100110.01010010.11110100 | 144.230.82.244
   IP2: 10010000.11100110.01010010.11110010 | 144.230.82.242

   IPs are both in subnet: 144.230.82.240 / 29


   /29 Subnet Mask: 255.255.255.248
     Wildcard Mask: 0.0.0.7

            Subnet: 144.230.82.240

      Subnet Range: 144.230.82.241 -
                    144.230.82.246

    Broadcast Addy: 144.230.82.247

 Next Network Addy: 144.230.82.248

        Usable IPs: 8 - 2