Subscriber Provided Prefix

      Last updated April 02, 2021

    Fastly's Subscriber Provided Prefix product allows you to have your IP spaces announced, routed, and served by Fastly infrastructure for use with production services. When you purchase this product, you provide your own IP address space to Fastly rather than use Fastly IP addresses. You can then direct traffic to your own IP addresses, which are reachable via HTTP Anycast on Fastly's infrastructure.

    We recommend this service for customers who want to control their address space by separating their network layer concerns from their content delivery concerns. By combining Fastly's Subscriber Provided Prefix service with our Origin Connect product and our DDoS Protection and Mitigation service, you can protect your origin servers by directing traffic through Fastly's global network.

    For more information about this product, contact


    To purchase Fastly's Subscriber Provided Prefix service you must also purchase Fastly's Enterprise Support package and our IP-to-Service Pinning Setup service.

    When you sign up for this product, you'll need to provide Fastly with an executed Letter of Authorization (LOA), on a form we provide, that grants us permission to announce your prefixes. The LOA includes, at a minimum, the IP blocks to announce, the registry and object identifier, as well as the administrative, technical, and abuse contacts for those prefixes.

    Using the Subscriber Provided Prefix product requires at least one /24 IPv4 or /48 IPv6 prefix for announcement purposes. Additional prefixes and larger prefixes may also be supported. These prefixes must not be originated from any autonomous system number (ASN) at the time Fastly announces them. They should also be dormant for a period of approximately three months prior to use by Fastly.

    How the Subscriber Provided Prefix product works

    Fastly will announce the designated prefixes identified in your LOA. Your prefixes will be announced along with existing Fastly prefixes and will be originated from the Fastly Autonomous System (AS) Number AS54113. The Subscriber Provided Prefix product supports HTTP and HTTPS traffic only and your prefixes will be terminated at Fastly for these two protocols. We make routing announcements on a global basis unless you request they be constrained to our defined North America and Europe region.

    To enable specific IP addresses within your announced prefix, Fastly combines this Subscriber Provided Prefix product with our IP-to-Service Pinning feature, which must be purchased separately. IP addresses that are not service pinned will not serve your traffic.

    After completing all the necessary routing announcements and setup within your CDN services, Fastly needs additional time to complete the setup. In general, you should allow for at least one month's lead time for us to set up routing announcements and CDN service. Your service order identifies the specific lead time Fastly needs for full operability.

    You may provide Fastly notice at any time to withdraw your prefix announcement by opening a ticket at We need at least one month's notice to permanently remove routing announcements and CDN service for your designated prefixes. When we receive notice of your request for prefix withdrawal, we will provide you with a withdrawal process timeline. This process starts with us reconfiguring your service within the Fastly network. When that reconfiguration work completes, you must then point your DNS records at Fastly to ensure uninterrupted service. Once your traffic is moved from your prefix to a Fastly prefix, we will withdraw the announcement.

    Conditions and limitations

    When using Fastly's Subscriber Provided Prefix product you agree to the following limitations:

    When using Fastly's Subscriber Provided Prefix product you agree to the following conditions:

    To specifically mitigate DDoS attacks, you agree that:

    Back to Top