1
Class A
Subnet Mask
255.0.0.0
2
Class B
Subnet Mask
255.255.0.0
3
Class C
Subnet Mask
255.255.255.0
4
Class A
Starting IP
0.0.0.0
5
Class A
Private Starting IP
10.0.0.0
6
Class A
Private Ending IP
10.255.255.255
7
Class B
Starting IP
128.0.0.0
8
Class B
Private Starting IP
172.16.0.0
9
Class B
Private Ending IP
172.31.255.255
10
Class C
Starting IP
192.0.0.0
11
Class C
Private Starting IP
192.168.0.0
12
Class C
Private Ending IP
192.168.255.255
13
Class D
Starting IP
224.0.0.0
14
Class E
Starting IP
240.0.0.0
15
Class B
Private First Octet
172
16
Class B
Private Second Octet Start
16
17
Class B
Private Second Octet End
31
18
Class C
Private First Octet
192
19
Class C
Private Second Octet
168
20
Class A
Private First Octet
10