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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
Medium Priority
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?  
Question by:Alistair7
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LVL 71

Accepted Solution

Chris Dent earned 2000 total points
ID: 12286176

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: is a Class A Scope, with all addresses between and usable (scope includes Network and Broadcast Address). is a Class B Scope, with all addresses between and usable (again including the Network and Broadcast Addresses). is a Class C Scope, with all addresses between and usable (one last time for those Network and Broadcast Addresses).

LVL 71

Expert Comment

by:Chris Dent
ID: 12286190
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 to

Author Comment

ID: 12295317
Is the automatically assigned 169.254 range also non routable?
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LVL 71

Expert Comment

by:Chris Dent
ID: 12295737
LVL 71

Expert Comment

by:Chris Dent
ID: 12295739
Although non-routable is a bad description, all IP ranges are routable, just some aren't used in the public IP space ;)

Author Comment

ID: 12300468

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