IP address assignment

If you are applying for a Janet Network connection, we can assign an IP address space to your organisation from those allocated to Jisc for use over the Janet Network.

Approaches to IP addressing

There are a number of approaches to IP addressing:

  • Providing IPv6 address space
    Janet's network backbone is fully enabled for IPv6. If you have a Janet connection, the IPv6 address space is available to you free of charge
  • Private IP4 address space and network address translation (NAT)
    If you are using IPv4 address space, NAT makes the best use of small blocks of addresses allocated from the globally unique IP address space, and assists in conserving this limited resource
  • IP subnet addressing
    Makes better use of IP address space; allows IP addresses to be divided into multiple smaller networks or subnets. Effective use of subnets may remove the need to obtain additional address space

Apply for an IP address space

Fill out our online form to obtain Janet IP addresses.

Apply now

Benefits and features

These include:

  • Appropriate address space and assignment advice
  • Scalability as your needs change (subject to agreement and notice)
  • Jisc being an RIPE NCC member, which ensures IP addresses comply with their assignment policies
  • IPv4 address space, a globally limited resource. Jisc assigns and recovers RIPE issued address space on behalf of our members
  • IPv6 address space assigned from within the Janet 2001:0630::/32 prefix

Requesting initial connection or additional IP address space

Requesting an initial connection to the Janet Network

If you are in the process of connecting to the Janet Network, our connections team will gather your requirements and have your initial address space allocation assigned to that connection

For more information about these connections and charges that may apply, please contact your relationship manager.

Requesting additional IP address space

Jisc's local internet registry team administrators recover all IP address requests, assessing member requirements against the appropriate policies before assigning any address space.

If you need further IP address space to facilitate additional network services, or an additional business and community engagement connection, send an initial email to ipaddress@ja.net. Following this, you will receive log in details for the web-based IP request portal.


Jisc's service desk and connections team can help with the following enquires:

Service level description

Service description

Jisc offers a service to administer the approval and assignment of IP addresses, allowing organisations to apply for appropriate addresses required for connectivity to the Janet Network.

Hours of service

The service is available during the business day as defined in SLD definitions.

Your responsibilities

You are responsible for providing all relevant information as requested by us to enable the processing of the application.


This service is centrally-funded.

Request for service

You can request this service via the service desk on 0300 300 2212 or via help@jisc.ac.uk

Service delivery time

Requests for IP addresses and the implementation of their associated reverse delegation and routing requirements will be completed within ten business days of receipt of all necessary information.

Terms and conditions

Please ensure your organisation understands and adheres to the terms and conditions


If you are experiencing an issue with the service, and wish to escalate the issue please contact us via the service desk on Tel: 0300 300 2212 or via email: help@jisc.ac.uk.

ISO certification

This service is included within the scope of our ISO9001 certificate.

Read more about International Organisation for Standardisation (ISO) standards and view Jisc certificates.

ISO 9001-2015 UKAS logo