basicly not true
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thats the list with local arena netowrk (private networks)
it all depends on the router how he can handle it
if you use a A class then the subnet is differend , it depends if the router can forward it to the right location or not
mostly you use 255.255.255.255 as subnet ( single ip) or 255.255.255.0 in case of lan ( 255 ip's )
but on A class is it 255.0.0.0 or 255.255.0.0 or 255.255.255.0 or 255.255.255.255 or any other kind of combination (depends how many ip's you each subnet like to give )
so basicly it does not make a difference , a local ip stays a local ip and it is up to the router to forward the local ip to the external ip
most company's use the 10.X.X.X range ( big company's ) and most home users use 192.168.X.X as they do not need mutch ip's
it depends to how the router is configured , if the subnet isnt right to the ip class then it will not work ( exept supernet but thats a differend story)
but before going to mutch offtopic
that 10.X.X.X is coming somewhere from ( a config file ) and if your router does not have the right setup for it then it will not work
Greets From PowerChaos