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IP Subnet with IIRC 1024 IPs, and Autonomous System Number respectively.

ASN:s are related to BGP, the Border Gateway Protocol, which is part of how the IP network is organized.

To explain a bit more: the first 22 bits (of the 32 bit IPv4 address) are fixed, so there are 10 free bits = 1024 addresses.

This is a fantastic, simple explanation of subnetting and CIDR notation. Well done.