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Networking Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.

IPv4 Classful Ranges

A
0.0.0.0
127.25­5.2­55.255
B
128.0.0.0
191.25­5.2­55.255
C
192.0.0.0
223.25­5.2­55.255
D
224.0.0.0
239.25­5.2­55.255
E
240.0.0.0
255.25­5.2­55.255

IPv4 Reserved Ranges

10.0.0.0
10.255.25­5.255
127.0.0.0
127.25­5.2­55.255
172.16.0.0
172.31.25­5.255
192.16­8.0.0
192.16­8.2­55.255
 

Subnetting

 
 

Common Ports