The RSNXE contains additional information needed to establish an Robust Security Network Association (RSNA). It is part of the beacon, probe response, association and re-association frames sent during Wi-Fi connection. It is a set of 1-bit fields (other than the first 4 bits indicates RSNXE length) which indicate whether a feature is supported or not supported.

The RSNXE is provided below from the standard:

The element ID is one octet long and is set to 244. The field length is given by the first 4 bits (0-3). The different support bits in RSNXE are as below:

If a station does not support any of the capabilities defined in the RSNXE, the RSNXE is not present in the frames that are sent during connection. In the case of WPA3, if SAE Hash-to-element is supported by the station, then the RSNXE element will be sent out on air and the specific bit will be set in the RSNXE information element.

WPA3 Enterprise Modes (salient points)