This table (compiled by Jouni) documents in which order IEs are added to association and reassociation request frames, and where they originate in the Linux implementation. 
|**Kernel/User** | **order\\ (assoc req)** |**order\\ (reassoc req)** |**IE number** |**name [amendment]** |
|K |3 |4 |0 |SSID |
|K |4 |5 |1 |Supp Rates |
|K |5 |6 |50 |Ext Supp Rates |
|K |6 |7 |33 |Power Capab |
|K |7 |8 |36 |Supp Chan |
|U |8 |9 |48 |RSN |
|K |9 |10 |46 |QoS Capab |
|K |10 |11 |70 |RRM Enabled Capab [11k] |
|U |11 |12 |54 |mobility domain [11r] |
|U |- |13 |55 |ftie [11r] |
|U |- |14 |57 |ric(multiple IEs; can include vendor IEs) [11r] |
|K |12 |15 |59 |supp reg classes [11y] |
|K |13 |16 |45 |HT Capab [11n] |
|K |14 |17 |72 |20/40 BSS Coex [11n] |
|K |15 |18 |127 |Extended Capab [11n] |
|K |16 |19 |? |QoS Traffic Capab [11v] |
|K |17 |20 |? |TIM Broadcast Req [11v] |
|K+U |last |last |221 |vendor-specific |