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IP addresses

An IPv4 address consists of 32 bits, written as four numbers from 0 to 255. The prefix after the slash says how many bits belong to the network. The remaining bits number the machines in the network.

\text{192.168.1.10/24}

address with a 24-bit network part

/24 \leftrightarrow \text{255.255.255.0}

prefix and netmask

Symbols

$/p$	prefix: number of network bits
$\text{octet}$	8 bits, a number 0–255

Example

$\text{10.0.5.77/24}$ : the network is $\text{10.0.5.0}$ , and the machine is number 77 in it.

Each octet is 8 bits, so four octets give 32 bits.

Practise iP networks and subnetting for free →

← JOIN and GROUP BY · Subnetting →

Part of Databases, Networks and Security: IP networks and subnetting.