how do i tell if i am running a custom ROM? I am pretty sure I am (just bought the phone, ran RootCheck, says its rooted)

system version: 6.16.211.xt912.Verizon.en.us
android 4.0.4
webtop version: wt-3.0.0
kernel version: 3.08-g29cf5e7
hudsoncm@il93lnxdroid54 #1
SMP PREEMPT Thu Jun 14 15:22:48 CDT 2012
build number: 6.7.2-180_DHD-16_M4-31
build date: THu Jun 14:57:16 CDT 2012

RootChecker Basic says "Current Device: GT-l9300" on a razr maxx???

I have rooted a HTC rezound before, but that is the extent of my experince...

PLEASE HELP!!! lol... Any assistance would be greatly appreciated!