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[Console Program] .NET/C# checks if the CIDR address contains the specified IPv4 address

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Posted onYesterday at 21:05 | | | |
Requirements: The gateway needs to do IP blacklist and whitelist control, blacklisted IP addresses are prohibited from access, and use CIDR to set addresses, which can specify a single IP address or add IP network blocks, and only need to determine whether the requested IP address is in the CIDR.

Review:
CIDR: Read the CIDR address description in one article
https://www.itsvse.com/thread-10676-1-1.html

Reserve the IP address CIDR block of the IPv4 private network
https://www.itsvse.com/thread-10679-1-1.html

The code is as follows:
The test results are shown below:





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