IPNetwork

The IPNetwork application was developed to be a small command line utility which will take care of complex network, ip, netmask,  subnet, cidr calculation. It works with IPv4,
it is written in C# and has a light and clean API and is fully unit tested.
Usage:
ipnetwork [-inmcbflu] [-d cidr|-D] [-h|-s cidr|-S|-w|-W|-x|-C network|-o network] networks ...
Print options
-i : network
-n : network address
-m : netmask
-c : cidr
-b : broadcast
-f : first usable ip address
-l : last usable ip address
-u : number of usable ip addresses
Parse options
-d cidr : use cidr if not provided (default /32)
-D : use default cidr (ClassA/8, ClassB/16, ClassC/24)
Actions
-h : help message
-s cidr : split network into cidr subnets
-w : supernet networks into smallest possible subnets
-W : supernet networks into one single subnet
-x : list all ipadresses in networks
-C network : network contain networks
-o network : network overlap networks
networks : one or more network addresses
(1.2.3.4 10.0.0.0/8 10.0.0.0/255.0.0.0 ...)
Example 1
Display ipnetwork informations :
c:\> ipnetwork 10.0.0.0/8
IPNetwork : 10.0.0.0/8
Network : 10.0.0.0
Netmask : 255.0.0.0
Cidr : 8
Broadcast : 10.255.255.255
FirstUsable : 10.0.0.1
LastUsable : 10.255.255.254
Usable : 16777214
Example 2
Split network into cidr
c:\> ipnetwork -s 9 10.0.0.0/8
IPNetwork : 10.0.0.0/9
Network : 10.0.0.0
Netmask : 255.128.0.0
Cidr : 9
Broadcast : 10.127.255.255
FirstUsable : 10.0.0.1
LastUsable : 10.127.255.254
Usable : 8388606
--
IPNetwork : 10.128.0.0/9
Network : 10.128.0.0
Netmask : 255.128.0.0
Cidr : 9
Broadcast : 10.255.255.255
FirstUsable : 10.128.0.1
LastUsable : 10.255.255.254
Usable : 8388606
Example 3
supernet networks into smallest possible subnets
C:\>ipnetwork -w 192.168.0.0/24 192.168.1.0/24
IPNetwork : 192.168.0.0/23
Network : 192.168.0.0
Netmask : 255.255.254.0
Cidr : 23
Broadcast : 192.168.1.255
FirstUsable : 192.168.0.1
LastUsable : 192.168.1.254
Usable : 510
Example 4
supernet networks into smallest possible subnets
c:\> ipnetwork -w 192.168.0.0/24 192.168.2.0/24
IPNetwork : 192.168.0.0/24
Network : 192.168.0.0
Netmask : 255.255.255.0
Cidr : 24
Broadcast : 192.168.0.255
FirstUsable : 192.168.0.1
LastUsable : 192.168.0.254
Usable : 254
--
IPNetwork : 192.168.2.0/24
Network : 192.168.2.0
Netmask : 255.255.255.0
Cidr : 24
Broadcast : 192.168.2.255
FirstUsable : 192.168.2.1
LastUsable : 192.168.2.254
Usable : 254
Example 5
supernet networks into smallest possible subnets
C:\>ipnetwork -W 192.168.0.0/24 192.168.129.0/24
IPNetwork : 192.168.0.0/16
Network : 192.168.0.0
Netmask : 255.255.0.0
Cidr : 16
Broadcast : 192.168.255.255
FirstUsable : 192.168.0.1
LastUsable : 192.168.255.254
Usable : 65534
Example 6
Split network into cidr, display full network only
C:\>ipnetwork -i -s 12 10.0.0.0/8 | grep -v \-\-
IPNetwork : 10.0.0.0/12
IPNetwork : 10.16.0.0/12
IPNetwork : 10.32.0.0/12
IPNetwork : 10.48.0.0/12
IPNetwork : 10.64.0.0/12
IPNetwork : 10.80.0.0/12
IPNetwork : 10.96.0.0/12
IPNetwork : 10.112.0.0/12
IPNetwork : 10.128.0.0/12
IPNetwork : 10.144.0.0/12
IPNetwork : 10.160.0.0/12
IPNetwork : 10.176.0.0/12
IPNetwork : 10.192.0.0/12
IPNetwork : 10.208.0.0/12
IPNetwork : 10.224.0.0/12
IPNetwork : 10.240.0.0/12
Example 7
Test if an ip is contained in a network
C:\>ipnetwork -C 10.0.0.1 10.0.0.0/8 10.0.1.0/24
10.0.0.1/32 contains 10.0.0.0/8 : False
10.0.0.1/32 contains 10.0.1.0/24 : False
Example 8
Test if a network overlap another network
C:\>ipnetwork -o 10.0.0.1/24 10.0.0.0/8 10.0.1.0/24
10.0.0.0/24 overlaps 10.0.0.0/8 : True
10.0.0.0/24 overlaps 10.0.1.0/24 : False
Example 9
remove one ip from a class and regroup them into the smallest possible network
C:\> ipnetwork -i -s 32 192.168.0.0/24 \
| grep -v \-\- \
| awk "{print $3;}" \
| grep -v 192.168.0.213/32
| xargs ipnetwork -i -w \
| grep -v \-\-
IPNetwork : 192.168.0.224/27
IPNetwork : 192.168.0.216/29
IPNetwork : 192.168.0.214/31
IPNetwork : 192.168.0.212/32
IPNetwork : 192.168.0.208/30
IPNetwork : 192.168.0.192/28
IPNetwork : 192.168.0.128/26
IPNetwork : 192.168.0.0/25