netbox/docs/core-functionality/tenancy.md

Tenants

A tenant represents a discrete entity for administrative purposes. Typically, tenants are used to represent individual customers or internal departments within an organization. The following objects can be assigned to tenants:

• Sites
• Racks
• Rack reservations
• Devices
• VRFs
• Prefixes
• IP addresses
• VLANs
• Circuits
• Virtual machines

If a prefix or IP address is not assigned to a tenant, it will appear to inherit the tenant to which its parent VRF is assigned, if any.

Tenant Groups

Tenants can be organized by custom groups. For instance, you might create one group called "Customers" and one called "Acquisitions." The assignment of tenants to groups is optional.