E: Alternative Ways to Assign an IP Address
XPress™ DR Industrial Device Server User Guide
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Network Bits
Host Bits
Netmask
Class A
8
24
255.0.0.0
Class B
16
16
255.255.0.0
Class C
24
8
255.255.255.0
Netmask
Host bits
255.255.255.252
2
255.255.255.248
3
255.255.255.240
4
255.255.255.224
5
255.255.255.192
6
255.255.255.128
7
255.255.255.0
8
255.255.254.0
9
255.255.252.0
10
255.255.248.0
11
.
.
.
.
255.128.0.0
23
255.0.0.0
24
Private IP Networks and the Internet
If your network is not connected to the Internet, and there are no plans to make such a
connection, you may use any IP address you wish.
If your network is not connected to the Internet and you have plans to connect, or you are
connected to the Internet and want to operate your XPress DRs on an intranet, use one of the
subnetworks below. These network numbers have been reserved for such networks. If you have
any questions about IP assignment, consult your Network Administrator.
Class A
10.x.x.x
Class B
172.16.x.x
Class C
192.168.0.x
Network RFCs
For more information regarding IP addressing see the following documents. These can be located
on the World Wide Web using one of the directories or indices:
RFC 950 Internet Standard Subnetting Procedure
RFC 1700 Assigned Numbers
RFC 1117 Internet Numbers
RFC 1597 Address Allocation for Private Internets