Technical Appendix
2476_en_I
PHOENIX CONTACT
A-1
A Technical
Appendix
A 1
Structure of IP Addresses
A 1.1
Valid IP Parameters
IP parameters comprise the following three elements: “IP address,” “subnet mask,” and
“default gateway/router.”
Valid IP Addresses are:
000.000.000.001 to 126.255.255.255 and 128.000.000.000 to 223.255.255.255
Valid Subnet Masks are:
255.000.000.000 to 255.255.255.252
Default Gateway/Router:
The IP address of the gateway/router must be in the same subnetwork as the address of the
switch.
A 2
Assigning IP Addresses
The IP address is a 32-bit address. See Figure A-1. The IP address consists of a network
part and a user part. The network part consists of the network class and the network
address. There are currently five defined network classes (see Table A-1). Classes A, B,
and C are used in modern applications, while classes D and E are hardly ever used. It is
therefore usually sufficient if a network device only “recognizes” classes A, B, and C.
Figure A-1
Location of bits within the IP address
With binary representation of the IP address, the network class is represented by the first
bits. The key factor is the number of “ones” before the first “zero.” The assignment of classes
is shown in Table A-1. The empty cells in the table are not relevant to the network class and
are already used for the network address.
With binary representation of the IP address, the network class is represented by the first
bits. The key factor is the number of “ones” before the first “zero.” The assignment of classes
is shown in Table A-1. The empty cells in the table are not relevant to the network class and
are already used for the network address.
bit
1
bit
3
2
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