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From: jason-tuhs@shalott.net
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Subject: Re: [TUHS] conventions around zero padding in ip4
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> I first learned in the 80s that 127.1 meant 127.0.0.1. I always
> assumed zero padding was defined in a standard *somewhere*, but am
> finding out maybe not.

A friend spent some time digging into this issue not too long ago; you may 
find his write-up interesting:

https://blog.dave.tf/post/ip-addr-parsing/


  -Jason