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Regional Information:
Arizona-Sonora Desert Museum Arizona-Sonora Desert Museum National Optical Astronomy Observatory National Optical Astronomy Observatory
The Pima Air and Space Museum The Pima Air and Space Museum Weather Underground DMAFB, Pima County, AZ Weather from Weather Underground

Technical References:
Ethernet Packet Type Codes Ethernet Vendor Codes (LARGE, Slow, search with "Find" in browser)
ASCII Character Dec/Octal/Hex Table IP Port Numbers and Services
Network Subnet and Wildcard Masks