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So there are A,B,C,D,E ranges like 1-126, etc... but in an IP address, what means 192 out of 192.168.12.4? Is it a class A block or what? I have trouble understanding. Thanks.

sysadmin1138
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Classful routing hasn't been done since 1993 - so this class A, B, C junk doesn't mean much anymore. Nowadays, there is Classless Inter-Domain Routing (CIDR). Regardless, an IPv4 address is just a 32-bit number. It's broken down into 8-bit chunks and printed in decimal in the dot notation for your human brain's convenience, but it doesn't mean anything in reality. All that 192 means is that the first 8 bits of your IP address are 11000000.

Your IP address is a bit of a special case, in that it's part of the 16-bit private network range for IPv4 (192.168.0.0 to 192.168.255.255).

Carl Norum
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