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host identification (host-id)

IP addresses consist of a network part and a user part. The user part corresponds to the host identification (host-id) and is located behind the network identification(netid).

With the classic IP address, the addresses were divided into address classes. Depending on the class, there were address classes A, B and C with allocated address spaces, the host identifier comprised 24 bits, 16 bits and 8 bits. This meant 16,777,216 (24 bit), 65,534 (16 bit) or 256 (8 bit) host identifiers.

IP address classes

IP address classes

With the introduction of Classless Interdomain Routing( CIDR) in the IPv4 protocol, the class division was abolished and between one and 256 x 16,777,216 (Class A) host addresses could be assigned. There was then even more freedom with the IPv6 address, which has a scope of 128 bits.

The host name and host number are assigned by the Network Information Center( NIC), in Germany by DeNIC.

Englisch: host identification - host-id
Updated at: 18.03.2019
#Words: 137
Links: intelligent peripheral (IP), network, user, host, identification
Translations: DE

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