class A, class B, class C

what is the difference of  class A, class B, and class C Internet addresses
Thank you
teeraAsked:
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Jay_Jay70Commented:
Hi teera,

assuming this isnt homework

http://support.microsoft.com/?kbid=164015

Cheers!
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jeff_01Commented:
Hi there,

IPv4 addresses are broken down into three parts, the network part, the subnet part (now often considered part of the network part) and the host part. There are three classes of IP address which determine how much is which.

Class       Start                END                  Default Subnet mask
A             1.0.0.0          126.0.0.0            255.0.0.0       
B             128.0.0.0       191.255.0.0         255.255.0.0       
C             192.0.0.0       223.255.255.0       255.255.255.0
D             224.0.0.0       239.255.255.0             
E             240.0.0.0       255.255.255.0       

Class D is used for Multicasting and Class E is Reserved.

HTH
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ECNSSMTCommented:
technically, this is only used for reference these days.  Since about 1994(I think), Classless Inter-Domain Routing (CIDR) replaced this due to the shortage of IP addresses; it permitted the reallocation of Class A and B subnets/IPs to support smaller installations.  

Between CIDR and NAT, the urgency for moving away from IPv4 (to IPv6) subsided.

Regards,
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