# Subnet See also: [How to manage subnets](https://documentation.ubuntu.com/juju/3.6/howto/manage-subnets.md#manage-subnets) A **subnet** is a range of IP addresses in CIDR notation. Subnets can be grouped to form a [space](https://documentation.ubuntu.com/juju/3.6/reference/space.md#space). A subnet can only be in one space.