IP Subnet Manager

Python program to assign first available IPv4 subnets given a network address and number of hosts

Designed for Class B network subnetting

Requirements

• Python 3.7
• Pandas 1.1

Sample Execution & Output

Run using command prompt,

python ./subnet-allocator-class-b.py

Prompting user input

######### Subnet Allocator - Class B #########
Enter customer name : NC State
Enter the required network address as [128-191].[0-255].0.0 : 152.1.0.0
Enter number of hosts required in the network [> 0]: 4095

output simliar to

   wildcard   used    netaddr avail   req      name
0        13   True  152.1.0.0  8190  4095  NC State
1        13  False       None  None  None      None
2        14  False       None  None  None      None
3        15  False       None  None  None      None

1. wildcard column is the number of bits used for the network assignment
2. used column indicates if the subnet is assigned or available
3. netaddr column is the network address for a particular subnet
4. avail column is the total number of IPv4 addresses available
5. req column is the number of IPv4 addresses required
6. name column is the identifier used for a specific customer

Note: Subnet mask, usable address range, broadcast address and other trivial details have been ommited for concision.

Example

Continuing from the initial sample the program recursively asks for required hosts on next input as follows,

Enter number of hosts required in the network [> 0]: 16382

Output is as follows,

   wildcard   used     netaddr  avail    req      name
0        13   True   152.1.0.0   8190   4095  NC State
1        13  False        None   None   None      None
2        14   True  152.1.64.0  16382  16382  NC State
3        15  False        None   None   None      None

Next iteration,

Enter number of hosts required in the network [> 0]: 2000 
   wildcard   used     netaddr  avail    req      name
0        13   True   152.1.0.0   8190   4095  NC State
1        11   True  152.1.32.0   2046   2000  NC State
2        11  False        None   None   None      None
3        12  False        None   None   None      None
4        14   True  152.1.64.0  16382  16382  NC State
5        15  False        None   None   None      None

Further,

Enter number of hosts required in the network [> 0]: 4000
   wildcard   used     netaddr  avail    req      name
0        13   True   152.1.0.0   8190   4095  NC State
1        11   True  152.1.32.0   2046   2000  NC State
2        11  False        None   None   None      None
3        12   True  152.1.48.0   4094   4000  NC State
4        14   True  152.1.64.0  16382  16382  NC State
5        15  False        None   None   None      None

Enter number of hosts required in the network [> 0]: 2022
   wildcard   used     netaddr  avail    req      name
0        13   True   152.1.0.0   8190   4095  NC State
1        11   True  152.1.32.0   2046   2000  NC State
2        11   True  152.1.40.0   2046   2022  NC State
3        12   True  152.1.48.0   4094   4000  NC State
4        14   True  152.1.64.0  16382  16382  NC State
5        15  False        None   None   None      None

Error handling

Case 1: Network address is not in Class B

######### Subnet Allocator - Class B #########
Enter customer name : NC State
Enter the required network address as [128-191].[0-255].0.0 : 192.168.0.0
Network number is not a Class B network, try again

Case 2: Cannot satisfy host requirements for subnets

######### Subnet Allocator - Class B #########
Enter customer name : NCSU 
Enter the required network address as [128-191].[0-255].0.0 : 128.0.0.0
Enter number of hosts required in the network [> 0]: 30000
   wildcard   used    netaddr  avail    req  name
0        15   True  128.0.0.0  32766  30000  NCSU
1        15  False       None   None   None  None
Enter number of hosts required in the network [> 0]: 40000
Cannot assign subnet
Unable to subnet