Subnetwork - Wikipedia
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Subnet Masks - Tech-FAQ
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What is Subnet Mask
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IPv4 - Subnetting
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Purpose of Subnet Masks (Network Addresses)
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Subnetting and masking
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Understanding IP Addresses and Subnet Masks | by Zach Gollwitzer | Medium
What is a subnet (subnetwork)? Definition from SearchNetworking
The TCP/IP Guide - IP Subnetting Step #3: Determining The Custom Subnet Mask
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Subnet Mask - Network Encyclopedia
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