The TCP/IP Guide - IP Subnetting Step #3: Determining The Custom Subnet Mask
IP address class assignments & subnet default mask concepts | AlphaPrep.net - YouTube
What is subnetting? What are the default subnet masks? Find the subnet address if the IP address is 129.31.72.24 and subnet mask is 255.255.192.0.
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Subnetting and Subnet Masks Explained
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