Sony Internal Codes for Walkman Models (Update 6)

In a previous article, I wrote about two upcoming portable audio players from Sony, the ICX-1291 and ICX-1300.  While I still do not have any additional information/specifications about the unknown devices, I was able to find out the internal codes for current and past models, so here is the list of all the models identified so far.

Update 6 – December 2025

I have re-ordered the list so it is now ordered by the code.

There are a lot of models missing, mostly because they do not have a teardown, or if a teardown exists, no ICX code is present. I suspect the ICX code is only used internally and during development. This is why the FCC listings have the code.