Prefix Registration for IPv6 Neighbor Discovery
RFC 9926, “Prefix Registration for IPv6 Neighbor Discovery”, is a Proposed Standard document published in February 2026 by P. Thubert. It updates RFC 4861, RFC 6550, RFC 8505, RFC 8928, RFC 9010. The canonical text is published by the RFC Editor.
Abstract
This document updates IPv6 Neighbor Discovery (RFC 4861) and IPv6 Subnet Neighbor Discovery (RFC 8505, RFC 8928) to enable a node that owns or is directly connected to a prefix to register that prefix to neighbor routers. The registration indicates that the registered prefix can be reached via the advertising node without a loop. The unicast prefix registration allows the node to request one or more neighbor routers to redistribute the prefix in another routing domain regardless of the routing protocol used in that domain. This document updates the Routing Protocol for Low-Power and Lossy Networks (RPL), as specified in RFCs 6550 and 9010, to enable a 6LoWPAN Router (6LR) to inject the registered prefix in RPL.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9926 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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