What is a host address?

A host address is the IP address of a specific device within a network, used to identify that device and deliver packets to it.

Short and clear: a host address is the address of an individual computer, server, router, and so on within a network.

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#What a host address means

An IP address logically consists of two parts:

• the network part: indicates which network the address belongs to
• the host part: indicates a specific device on that network

A host address is an address in which:

• the network part identifies the network
• the host part is not zero and does not consist of all ones

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#Example (IPv4)

Network:

192.168.1.0/24

On this network:

• network address: 192.168.1.0
• broadcast address: 192.168.1.255
• host addresses:

Any of these addresses can be:

• assigned to a device
• used for exchanging data

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#Why a host address is needed

A host address is used for:

• identifying a specific device
• delivering IP packets to the recipient
• establishing connections (together with TCP/UDP ports)

Without a host address:

• it would be impossible to understand which exact device the data is intended for

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#What is important to remember for an interview

• a host address:
  • is assigned to a device
  • is unique within its own network
• it is not equal to:
  • the network address
  • the broadcast address