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IP Network Classes

The Class of an IP Network is very important for Internet Routing. You must know what Class your network number is in order to properly mask your routes.

Class	Network Portion	Hosts Allowed Per Network	Standard Subnet Mask
A*	1.-127.0	16,000,000+	255.0.0.0
B	128.0-191.255	65,536	255.255.0.0
C	192.0.0-223.255.255.255	255	255.255.255.0

*Note:
Most customers are now given a SUBNET of our 38.0.0.0 Class A network. So even though the IP network has a Class A network mask, a Class C subnet mask must be used in order for proper routing to occur.