User manual

Startup and Functions
7278_en_01 PHOENIX CONTACT 2-3
IP addresses can be represented in decimal or hexadecimal form. In decimal notation,
bytes are separated by dots (dotted decimal notation) to show the logical grouping of the
individual bytes.
Possible Address Combinations
Figure 2-2 Structure of IP addresses
The decimal points do not divide the address into a network and user address. Only the
value of the first bits (before the first "zero") specifies the network class and the number
of remaining bits in the address.
7 bits 24 bits
14 bits 16 bits
21 bits
8 bits
28 bits
27 bits
Netzwork ID
Host ID
Host ID
Host ID
Netzwork ID
Netzwork ID
0
0
0
0
0
1
11
11
1
1111
Class A
0.0.0.0 - 127.255.255.255
Class B
128.0.0.0 - 191.255.255.255
Class C
192.0.0.0 - 223.255.255.255
Class D
224.0.0.0 - 239.255.255.255
Class E
240.0.0.0 - 247.255.255.255
Identifier for multicast group
Reserved for future applications