What is IE ID 221 in probe response?

[Denis Vlasenko]

Hi folks, Jouni,

A user reported that he is receiving probe responses with unknown
IE ID 221. IE bytes look like this:

DD 04 08 00 28 00

What is this? I googled for it but found nothing...

Just in case, this is a full dump of probe response packet:

fc: ? ? ?50 00
dur: ? ? 02 01
ra: ? ? ?00 80 C8 AB 41 D4
ta: ? ? ?00 80 C8 AA CF 07
bssid: ? 00 80 C8 AA CF 07
seq: ? ? C0 C9
tm: ? ? ?0B A4 BA 30 01 00 00 00
bcn_int: 64 00
cap_info:51 00
essid: ? 00 09 62 69 65 73 73 6D 61 6E 6E
rates: ? 01 05 82 84 8B 96 AC
chan: ? ?03 01 06
???: ? ? DD 04 08 00 28 00

20:25:46 acx: unknown EID 221 in mgmt frame at offset 57

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vda