Instance Naming Convention

ALCON,
I am trying to figure something out and need your assistance. I am trying to figure out what the instance naming convention is and how I can use it to determine what server I am on.

After enabling the network stats, there is a bar at the top of the screen and at the far right, there is the Instance name.

For example, here are a few I have played on recently:

NUKpwnFF
NUKpdHFG 
NUKpvXFC

Gmnx/XFE

What got me interested is the last one. I have never had an instance other than ones that start with NUKp. Then I got the Gmnx one, so I know there is something to it. I think they define the server location, and maybe even the game mode and map you are playing on. My ping and time nudge vary widely depending on what instance I am thrown into by MM. For example, I rarely have a TN that is higher than my ping, but I had one in NUKpvXFC but then had a great ping with a low time nudge in NUKpnnFC and my gaming experience was completely different. With the low time nudge, my experience feels better, when the TN was higher than my LAT, it was like playing with rubber bullets in mud. 

Thanks in advance. XP given to all who respond with some instances they have played in. Please also add where you are located in terms of region.