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10.0.0.x or 192.168.0.x non-routable network - which should I use?

Posted on 2004-10-12
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Last Modified: 2007-12-19
I am setting up a 2003 server network at school.  Is there some reason why I should be using the 192.168... range instead of the 10.0.0.x range?  When the DHCP server suddenly stops functioning, then the 192.168.x.x range is automatically adopted by each PC. Understood.  Is this the reason why I see so little reference to and use of the 10.0.0.x range?  
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Question by:Alistair7
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Chris Dent earned 500 total points
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No reason you should use one over the other except for the range of the scope. If you get the 192 Address on a PC have you tried seeing where it is getting the address (possibly a Router / Firewall)? If you run:

ipconfig /all

At the command prompt it will tell you whether or not it is using DHCP, and the Server Address if it is.

Just for reference:

10.0.0.0/8 is a Class A Scope, with all addresses between 10.0.0.0 and 10.255.255.255 usable (scope includes Network and Broadcast Address).

172.16.0.0/12 is a Class B Scope, with all addresses between 172.16.0.0 and 172.31.255.255 usable (again including the Network and Broadcast Addresses).

192.168.0.0/16 is a Class C Scope, with all addresses between 192.168.0.0 and 192.168.255.255 usable (one last time for those Network and Broadcast Addresses).

HTH
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by:Chris Dent
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I keep forgetting to add things...

If no DHCP Server is present (and the Network Connection is active) then an Address from the Automatic Range is assigned:

This is a Class C Subnet (/16) with Addresses in the Range 169.254.0.0 to 169.254.255.255.
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by:Alistair7
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Is the automatically assigned 169.254 range also non routable?
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by:Chris Dent
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Yep
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by:Chris Dent
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Although non-routable is a bad description, all IP ranges are routable, just some aren't used in the public IP space ;)
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by:Alistair7
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thanks
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