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Network and IP address calculator

Show the network, broadcast, first and last addresses of a given network

In network masks, the "bit format" is also called CIDR format (CIDR = Classless Inter-Domain Routing).

Subnet mask converter (bit dotted decimal format)

Network/node calculator

Decimal subnet mask reverse calculator

Decimal subnet mask converter

Calculate the bitwise complement of an IP address (inverse)

Network and IP address calculator

Default

Network listNetwork 0.0.0.0, mask 0.0.0.0"×

Network Host Broadcast address
Start End
0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0

Mask address converter based on the number of hosts

TCP/IP base converter

The number of usable addresses a mask converts to on the network

IP multicast address range

All multicast addresses are easy to recognize because they start with the pattern "1110".

224.0.0.0 - 224.0.0.255 well-known multicast addresses, control channel

224.0.1.0 - 238.255.255.255 global (internet-wide) multicast addresses

239.0.0.0 - 239.255.255.255 local multicast addresses

Introduction to the subnet mask calculator

LAN planning tool, subnet calculation and division, subnet mask conversion across bases, IP address base conversion

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How to use

This tool belongs to the “Calculators & converters” category.

  1. 1Type the value and check the unit the field is labelled with.
  2. 2Pick the target unit or formula; common equivalents are shown alongside.
  3. 3Round to the precision you need — results keep several significant decimals by default.

Your input is processed locally in the browser whenever possible. We do not store it.

Frequently asked questions

Any precision loss?

Decimal conversions of binary storage differ in the last digits. Use a proper maths package for engineering work.

Is data size 1000 or 1024?

Both conventions are shown; the difference is the KiB/KB and MB definitions.

Can I rely on the loan calculator?

It demonstrates the annuity formula only. Actual costs follow your bank or contract.