subnet_util

Overview

Simple library that can be used to perform subnet calculations and validate the format of IPv4 IP Addresses and Subnet Masks.

Table of Contents

• Creating an object
• check_ip method
• check_mask method
• ip method
• subnet method
• network method
• broadcast method
• subnet_bits method
• host_count method

Creating an object

This library uses the Subnet_util class. To create an object, you'll need to supply two arguments:

IP Address and Subnet Mask

Here's an example of creating an object and calling its attributes

$ a = Subnet_util('172.16.10.1', '255.255.255.0')

$ a.ip_address
'172.16.10.1'

$ a.subnet_mask
'255.255.255.0'

check_ip method

The check_ip method will check the validity of the ip address. If the address is valid, it will return 'True'. If it is not valid, it will return 'False'

$ a.check_ip()
True

check_mask method

The check_mask method will check the validity of the subnet mask. If the subnet mask is valid, it will return 'True'. If it is not valid, it will return 'False'

$ a.check_mask()
True

ip method

The ip method will return the ip address in either dotted decimal format or binary format if the 'binary' argument is set to True. By default, it will return the ip in dotted decimal format.

$ a.ip()
'10.0.0.1'

$ a.ip(binary=True)
'00001010000000000000000000000001'

subnet method

The subnet method will return the subnet mask in either dotted decimal format or binary format if the 'binary' argument is set to True. It is also possible to return the wildcard mask in either decimal or binary format when setting the wildcard argument to True.

$ a.subnet()
'255.255.0.0'

$ a.subnet(binary=True)
'11111111111111110000000000000000'

$ a.subnet(wildcard=True)
'0.0.255.255'

$ a.subnet(wildcard=True, binary=True)
'00000000000000001111111111111111'

network method

The network method will return the network address in either dotted decimal format or binary format if the 'binary' argument is set to True. By default, it will return the network address in dotted decimal format.

$ a.network()
'10.0.0.0'

$ a.network(binary=True)
'00001010000000000000000000000000'

broadcast method

The broadcast method will return the broadcast address in either dotted decimal format or binary format if the 'binary' argument is set to True. By default, it will return the broadcast address in dotted decimal format.

$ a.broadcast()
'10.0.255.255'

$ a.broadcast(binary=True)
'00001010000000001111111111111111'

subnet_bits method

The subnet_bits method will return the number of subnet bits in the familiar shorthand version of '/' + number of bits.

$ a.subnet_mask
'255.255.0.0'
$ a.subnet_bits()
'/16'

host_count method

The host_count method returns the number of valid hosts in a given network not including the network address and the broadcast address.

$ a.host_count()
65534

Special Recognition

This library is largely a derivative of code developed by Mihai Catalin Teodosiu