Specifications

Installation and startup procedure
48
3.4 Basic settings
RS2-4R
Release 1.0 03/04
The network address represents the fixed part of the IP address. The
worldwide leading regulatory board for assigning Internet addresses is the
IANA (Internet Assigned Numbers Authority). If you need an IP address
block, contact your Internet-Service-Provider. Internet Service Providers
should contact their local higher-level organization:
D APNIC (Asia Pacific Network Information Centre) - Asia/Pacific Region
D ARIN (American Registry for Internet Numbers) - Americas and Sub-
Sahara Africa
D LACNIC (Regional Latin-American and Caribbean IP Address Registry) –
Latin America and some Caribbean Islands
D RIPE NCC (Réseaux IP Européens) - Europe and Surrounding Regions
Fig. 8: Bit representation of the IP address
All IP addresses belong to class A when their first bit is a zero, i.e. the first
decimal number is less than 128.
The IP address belongs to class B if the first bit is a one and the second bit
is a zero, i.e. the first decimal number is between 128 and 191.
The IP address belongs to class C if the first two bits are a one, i.e. the first
decimal number is higher than 191.
Assigning the host address (host id) is the responsibility of the network
operator. He alone is responsible for the uniqueness of the IP addresses he
assigns.
Net ID - 7 bits Host ID - 24 bits0
I
I
I
0
I
I I I
0
I I I 0
Net ID - 14 bits
Net ID - 21 bits
Multicast Group ID - 28 bits
reserved for future use - 28 b its
Klasse A
Klasse B
Host ID - 16 bits
Host ID - 8 bit s
Klasse C
Klasse D
Klasse E