HP 200 Series Services And Applications page 112

Internet Protocol Routing Service
IP Addressing Scheme
Notation
IP addresses are written in dotted decimal notation. Each decimal group
(between the decimal points) is the decimal equivalent of 8 bits of the binary
address. Notice that the dotted decimal divisions do not exactly correspond
to the network, subnet, and host field divisions of the address. One address
field may cover more than one dotted decimal division. Or, the division
between address fields may not fall in the same place as a dotted decimal
division. It is recommended that subnet/host fields be allocated at a dotted
decimal division point (at a "byte boundary") whenever possible.
binary:
dotted decimal:
address fields:
The address class can be determined by the first decimal number. This is
because the leftmost bits are assigned according to the address class:
For a class A address, the first digits are in the range 1 through 126
(leftmost bit is 0).
For a class B address, the first digits are in the range 128 through 191
(leftmost bits are 10).
For a class C address, the first digits are in the range 192 through 223
(leftmost bits are 110).
2-60
IP Addresses
1000 0100 0000 0111
132.
network
132.7
class A 0
8 bits 24 bits
class B 10
16 bits 16 bits
class C 110
24 bits
* Some addresses are reserved and are not included in the ranges listed.
0011 0100
7. 52.
subnet
52
Address Range *
1. x. x. x through 126. x. x. x
128. 1. x. x through 191. 254. x. x
192. 0. 1. x through 223. 255. 254. x
8 bits
0001 0011
19
host
19