Sorting IP addresses in vim

1) Prepend zeros to the single-digit and two-digit numbers:

:%s/\<\d\d\?\>/0&/g|%&&

2)
Sort the lines comparing IP addresses as text:

:sort r/\(\d\{3}\)\%(\.\d\{3}\)\{3}/
or (%!sort -n ) ?!

3)
Strip redundant leading zeros:

:%s/\<00\?\ze\d//g

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To run all three steps as a single command, one can use the following one-liner:

:%s/\<\d\d\?\>/0&/g|%&&|sor r/\(\d\{3}\)\%(\.\d\{3}\)\{3}/|%s/\<00\?\ze\d//g