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AWS VPCs and CIDR blocks (possibly more than you've ever wanted to know about IP addresses, networks, subnet masks and all that stuff) – Kev's Development Toolbox
IP Addressing - Network Engineering Apprenticeship Training Curriculum - Network Engineering Apprenticeship Training
The Sky Networks - CIDR CIDR (Classless Inter-Domain Routing) notation rather than the common subnet mask 255.x.x.x when configuring addresses and networks. Refer to the CIDR Subnet Table to find the CIDR
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The TCP/IP Guide - IP "Supernetting": Classless Inter-Domain Routing (CIDR) Hierarchical Addressing and Notation
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