Class C:

255.255.255.yyy
yyy : from 0 to 255

We mask as follows:

255.255.255.0
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
255.255.255.252
255.255.255.254


 Subnet Mask
 Subnet Bits
 Maximum Subnets
 Hosts per Subnet

255.255.255.0 	 
  0 	
 1	
256 - 2 =  254
255.255.255.128 
  1 	
 2	
128 - 2 = 126
255.255.255.192 
  2 	
 4	
64 - 2 = 62
255.255.255.224 
  3 	
 8	
32 - 2 = 30
255.255.255.240 
  4 	
 16	
16 - 2 = 14
255.255.255.248 
  5 	
 32	
8 - 2 = 6
255.255.255.252 
  6 	
 64	
4 - 2 = 2
255.255.255.254 
  7 	
 128	
2 - 2 = 0



Hosts = (256 - Mask)  - 2
Wildcard Mask: 0.0.0.(255 - Mask)

Subnet ID Example: 192.168.16.0 
-------------------------------

Mask: 0
Broadcast Address: 192.168.16.255
Wildcard Mask: 0.0.0.255
0 + 255 = 255
Host Address Range: 192.168.16.0  - 192.168.16.254

Mask: 128
Broadcast Address: 192.168.16.127
Wildcard Mask: 0.0.0.127
128 + 127 = 255
Host Address Range: 192.168.16.0  - 192.168.16.126

Mask: 192
Broadcast Address: 192.168.16.63
Wildcard Mask: 0.0.0.63
192 + 63 = 255
Host Address Range: 192.168.16.0  - 192.168.16.62

Mask: 224
Broadcast Address: 192.168.16.31
Wildcard Mask: 0.0.0.31
224 + 31 = 255
Host Address Range: 192.168.16.0  - 192.168.16.30

Mask: 240
Broadcast Address: 192.168.16.15
Wildcard Mask: 0.0.0.15
240 + 15 = 255
Host Address Range: 192.168.16.0  - 192.168.16.14


Mask: 248
Broadcast Address: 192.168.16.7
Wildcard Mask: 0.0.0.7
248 + 7 = 255
Host Address Range: 192.168.16.0  - 192.168.16.6

Mask: 252
Broadcast Address: 192.168.16.3
Wildcard Mask: 0.0.0.3
252 + 3 = 255
Host Address Range: 192.168.16.0  - 192.168.16.2

Mask: 254
Broadcast Address: 192.168.16.1
Wildcard Mask: 0.0.0.1
254 + 1 = 255
Host Address Range: 192.168.16.0  - 192.168.16.0 -- Not to be considered.