All internet protocols are specified in a special document, called RFC, moreover all RFCs are located at https://www.ietf.org/rfc/, for example UDP is specified by RFC 768.

I wrote a script to download RFC document according to its numberdownload_rfc.py

 

Usage:

download_rfc.py [options]

 

Options:

  -n                  RFC number

  -o                 output rfc-file in txt-format

 

Example [download RFC-768, UDP spec]:

python download_rfc.py -n 768  -o udp_spec.txt

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