Try this Google search result listing. Or, look at this Cisco Technote on ip addressing.

Class C
 Mask 	 Notation 	 Subnets 	 Hosts 
 255.255.255.0	  /24	1	256
 255.255.255.128	  /25	2	128
 255.255.255.192	  /26	4	64
 255.255.255.224	  /27	8	32
 255.255.255.240	  /28	16	16
 255.255.255.248	  /29	32	8
 255.255.255.252	  /30	64	4
 255.255.255.254	  /31	128	2
 255.255.255.255	  /32	256	1
 
 Class B
 Mask	 Notation 	 Subnets 	 Hosts 
 255.255.0.0	  /16	2	65,536
 255.255.128.0	/17	2	32,768
 255.255.192.0	/18	4	16,384
 255.255.224.0	/19	8	8,192
 255.255.240.0	/20	16	4,096
 255.255.248.0	/21	32	2,048
 255.255.252.0	/22	64	1,024
 255.255.254.0	/23	128	512
 255.255.255.0	/24	256	256
 
 Class A
 Mask	 Notation 	 Subnets 	 Hosts 
 255.0.0.0	/8	1	16,777,216
 255.128.0.0	/9	2	8,388,608
 255.192.0.0	/10	4	4,194,304
 255.224.0.0	/11	8	2,097,152
 255.240.0.0	/12	16	1,048,576
 255.248.0.0	/13	32	524,288
 255.252.0.0	/14	64	262,144
 255.254.0.0	/15	128	131,072
 255.255.0.0	/16	256	65,536
 
 

In the IT trenches? So am I - read my IT-Trenches blog
Type subnet calculator in google...it is a free toll.

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