Get IMEI / MEID from device connected to AP or website visitor

You cannot get imei/meid from http data, that number is local to the device and not sent via TCP, you could with some script run a local app in the device, but getting the info back to the http request would be a problem, also depending on the browser and its settings you may not even be able to run anything from scripts. The only viable option would be to create an app so visitors use that app to visit your site and make that app get the info you want, but it really sounds like you want to get private information without the user being able to do anything, doesnt sound legit.

Everything is legit, but thanks for your input albeit not related to the question. FWIW, the user isn't "not doing anything," they are connected to a private network that I'm allowing them to connect to...hence the part of the post you overlooked. Thanks for answering the first part.
Anyone able to answer the second part?

Hi Mike,

Just out of curiosity any specific reason to go for IMEI? Are you trying to identify unique devices or is there any other purpose?

Regards,
Chinmay.

It would be a 2 part process and cannot be done server side unless you find some exploit to run code locally or ask the user to allow some plugin to run (most mobile browsers do not allow plugins of this kind), good luck.