IP V4 Network Calculator | A B C ← IP ADDRESS CLASSES
OCTET 1. OCTET 2. OCTET 3. OCTET 4 / CIDR
. . . /




CLASS A | CIDR 8 | SUBNET: 255.0.0.0
CLASS B | CIDR 16 | SUBNET: 255.255.0.0
CLASS C | CIDR 24 | SUBNET: 255.255.255.0








CIDR [SUBNET MASK]
32 [255,255,255,255]
31 [255,255,255,254]
30 [255,255,255,252]
29 [255,255,255,248]
28 [255,255,255,240]	
27 [255,255,255,224]
26 [255,255,255,192]
25 [255,255,255,128]
CIDR [SUBNET MASK]
24 [255,255,255,0]
23 [255,255,254,0]	
22 [255,255,252,0]	
21 [255,255,248,0]
20 [255,255,240,0]
19 [255,255,224,0]
18 [255,255,192,0]	
17 [255,255,128,0]	
CIDR [SUBNET MASK]
16 [255,255,0,0]
15 [255,254,0,0]
14 [255,252,0,0]
13 [255,248,0,0]	
12 [255,240,0,0]	
11 [255,224,0,0]
10 [255,192,0,0]
9 [255,128,0,0]
CIDR [SUBNET MASK]
8 [255,0,0,0]	
7 [254,0,0,0]	
6 [252,0,0,0]
5 [248,0,0,0]
4 [240,0,0,0]
3 [224,0,0,0]	
2 [192,0,0,0]	
1 [128,0,0,0]
0 [0,0,0,0]