You have indicated that the amateur radio TCP/IP geographic usage area that you are interested in is outside of the area covered by the SCDCC (Southern California).  As such, information outside our area is minimal and is left to organizations which exist in each respective geographic area.  However, to assist you, here are some links that might prove useful:

Neighboring TCP/IP Area Links:

•   2   - Northern California TCP/IP Information - Sacramento Area
•   4   - Northern California TCP/IP Information - San Francisco Bay
• 124 - Arizona TCP/IP Information   (Download Regional Domain.txt file)
• 125 - Nevada TCP/IP Information
• 173 - Mexico TCP/IP Information

• Master Amateur Radio TCP/IP Information
• Master Amateur Radio TCP/IP Coordinator's List - From UCSD Archives