---
syntax: markdown
tags: [tldr, common]
source: https://github.com/tldr-pages/tldr.git
---
# cidr

> Simplifies IPv4/IPv6 CIDR network prefix management with counting, overlap checking, explanation, and subdivision.
> More information: <https://github.com/bschaatsbergen/cidr>.

- Explain a CIDR range:

`cidr explain {{10.0.0.0/16}}`

- Check whether an address belongs to a CIDR range:

`cidr contains {{10.0.0.0/16}} {{10.0.14.5}}`

- Get a count of all addresses in a CIDR range:

`cidr count {{10.0.0.0/16}}`

- Check whether two CIDR ranges overlap:

`cidr overlaps {{10.0.0.0/16}} {{10.0.14.0/22}}`

- Divide a CIDR range into a specific number of networks:

`cidr divide {{10.0.0.0/16}} {{9}}`
