Here are my details from my XBOX. I am running a flashrom homebrew with X2-4973/Evox2.6, but I turn off the modchip for the XBL testing.
BIOS: 4034
MFD: 12-15-2001
LOC: Canada
All settings Auto with router having UPNP on
X:0000-F001
Y:008A-0FE0
Z:AFFF-0018
---------------------------------------------------------
static IP/DNS auto UPNP on
X:0001-0000
Y:0000-0000
Z:0000-0000
---------------------------------------------------------
all settings static UPNP on
X:0000-0000
Y:008A-0F80
Z:AFFF-0018
---------------------------------------------------------
no cable connected
X:8000-0011
Y:0000-0000
Z:0000-0000
---------------------------------------------------------
settings all auto, xbox IP blocked, UPNP on
X:0000-F001
Y:008C-0060
Z:0000-274C
---------------------------------------------------------
settings all auto, UPNP off
X:0000-F001
Y:008A-0FE0
Z:8015-1917
---------------------------------------------------------
modchip on with X2-4973, static IP,auto DNS, UPNP off
X:0001-0005
Y:0000-0000
Z:0000-0000
---------------------------------------------------------
modchip on with X2-4973, settings auto, UPNP off
X:0000-F001
Y:008A-0C22
Z:AFFF-0018
---------------------------------------------------------
modchip on with evox2.6, static IP,auto DNS, UPNP off
X:0001-0005
Y:0000-0000
Z:0000-0000
---------------------------------------------------------
modchip on with evox2.6, auto settings, UPNP off
X:0000-F001
Y:008A-0FE0
Z:8015-1917
Since everyone is being banned with 6xxx in the 2nd part of Y, I can't seem to get a 4xxx or even a 6xxx to figure out whether I am banned or not.

But the interesting thing is that UPNP which the XBL relies on for communication changes in Z when you enable disable UPNP on your linksys router..
Happy Hunting.
G16aByT3