Diff for "SubNetting"

Differences between revisions 3 and 4

Original ClassfulAddressing

Class	Starts With Bits	Network Bit Length	Host Bit Length	Range of Host Addresses
Class A	0	8	24	1.0.0.0 to 127.255.255.255
Class B	10	16	16	128.0.0.0 to 191.255.255.255
Class C	110	24	8	192.0.0.0 to 223.255.255.255
Class D	1110	Multicast Address		224.0.0.0 to 239.255.255.255
Class E	1111	Reserved for future use		240.0.0.0 to 255.255.255.255

Subnetting

The bit patern at the beginning of an address gave the type. But this is a very ineffecient classification because what if someone needs only 256 addresses? The you have to give them a class B.

So subnetting allows us to use a subnet mask to hand out smaller address ranges:

124.0.0.0/255.255.255.240 or 124.0.0.0/28 is a classless subnet that has 16 IP addresses in it.

If you get confused, you can always translate the address and the subnet mast to binary and examine them there.

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-  ⇤ ← Revision 3 as of 2003-09-25 18:47:47 → 
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