Ip Addresses; Subnets And Using A Subnet Mask - IBM 8271 Nways F12 User Manual

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HAPTER ETTING

IP Addresses

Subnets and Using a
Subnet Mask
U M
P FOR ANAGEMENT
To operate correctly, each device on your network must have a unique
IP address. IP addresses have the format n.n.n.n where n is a decimal
number between 0 and 255, for example 191.128.40.120:
The first part (191.128 in the example) identifies the network on
which the device resides.
The second part (40.120 in the example) identifies the device within
the network.
If your network is internal to your organization only, you may use any
arbitrary IP address. We suggest that you use addresses in the series
191.100.X.Y, where X and Y are numbers between 1 and 254.
If your network has a connection to the external IP network, you need
to apply for a registered IP address. This system ensures that each IP
address is unique; if you do not have a registered IP address, you may
be use an identical address to someone else and your network may not
operate correctly.
Obtaining a Registered IP Address
InterNIC Registration Services is the organization responsible for
supplying registered IP addresses. The following contact information is
correct at the time of publication:
Network Solutions
Attn: InterNIC Registration Service
505, Huntmar Park Drive
Herndon
VA 22070
U.S.A.
Telephone: (1) (703) 742 4777
If you have access to the Internet, you can find further information
about InterNIC by entering the URL
browser.
You can divide your IP network into sub-networks or subnets. Support
for subnets is important because the number of bits assigned to the
device part of an IP address limits the number of devices that may be
addressed on any given network. For example, a Class C address is
restricted to 254 devices.
www.internic.net
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