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Fixing a stubborn netmask setting
Authored by: LouieNet on Jun 08, '03 03:40:51PM
Numbski wrote:

That's called a class C. In our above example, that give you all bits turned on in the first three octets. 8+8+8, a /24. Or if you add the values of those bits together,

Okay, you can all go take your CCNA's. Hope you pass. ;)

Does the CCNA test ask the difference between "/24" and "class C"? :)

For clarification, all class C addresses are defined to fall in the IP address range - Networks that use class C addresses should use a /24 netmask (

In contrast, not all /24 networks need to fall in class C address space. Class A ( - and class B ( - addresses can be subnetted using /24 netmasks if the network equipment supports CIDR. (And if your gear doesn't do CIDR, try to sell it! :)

Apple's corporate network would have melted by now if they haven't subnetted their class A.

G4 cube, 1152M RAM, OS X Server 10.2.6

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