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updated:6/17/98


 

 

 

Related Topic

Setting up a Private TCP/IP Network


[Advanced]

How can I set up a TCP/IP network without connecting to the Internet?

If you are not connecting to the Internet, you can use IP addresses from a range that have been reserved specifically for use on a private IP network. An IP address is comprised of a network number and a node number; when selecting IP addresses for your network, computers on the same network segment, or "subnet", must have:

  • The same network number, i.e., the portion of the IP address that represents the network number must be the same for all devices on the same network

  • Unique node numbers: the node number is what distinguishes one device from another.

  • The same subnet mask: the mask is what determines how the IP address is subdivided into Network portion and Node portion.

This table will assist you in selecting IP addresses for your Private IP network.

This is not the entire range of addresses available for Private IP networks, just a subset.

 

Range (for a single subnet) Default Subnet Mask Class Network # Portion Node # Portion Sample addresses for a computers on a single network segment*

10.0.0.0

through

10.255.255.255

255.0.0.0 A 10 0.0.0

10.0.0.1

through

10.255.255.254

172.16.0.0

through

172.16.255.255

255.255.0.0 B 172.16 0.0

172.16.0.1

through

172.16.255.254

192.168.0.0

through

192.168.0.255

255.255.255.0 C 192.168.0 0

192.168.0.1

through

192.168.0.254

192.168.1.0

through

192.168.1.255**

255.255.255.0 C 192.168.1 0

192.168.1.1

through

192.168.1.254

*Note that when converted to binary, node addresses that are all zeroes (.0, or ‘00000000’) and all ones (.255, or ‘11111111’) are reserved for referring to the network itself, and for the network’s broadcast address, respectively. So addresses 192.168.0.0 and 192.168.0.255 would not be available addresses for client workstations.

**There are many more Class C addresses available for Private IP networks: in fact, you can use any class C address in the range 192.168.0.x through 192.168.255.x (where x would represent the node ID, a number between 1 and 254); just remember that, with default subnet mask, the first 3 octets must be the same for all devices on the network (it is the first 3 octets that specify the network number for a Class C address).

Recommendation: use a different Class C address for each subnet on your private Intranet.