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Converting an IP from hexadecimal to dotted-quad

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Contributed by cpc on Aug 29, 2002 at 03:01 UTC
Q&A  > data formatting


Description:

What would be the most efficient way to convert an IP address from hexadecimal to dotted quad notation?
E.g. from 7F000001 to 127.0.0.1

I came up with:

$ip = '7F000001'; use Socket; inet_ntoa( pack( "N", hex( $ip ) ) )

Answer: Converting an IP from hexadecimal to dotted-quad
contributed by merlyn

perhaps

join '.', unpack "C*", pack "H*", $ip;
Answer: Converting an IP from hexadecimal to dotted-quad
contributed by Abigail-II

Here's one way, using Regexp::Common, although it's unlikely to be the most efficient:

use Regexp::Common; $ip =~ s( ^$RE{net}{IPv4}{hex}{-sep=>''}{-keep}$ ){ join '.', map { hex } $2, $3, $4, $5 }xe;
Answer: Converting an IP from hexadecimal to dotted-quad
contributed by jmcnamara

You could also do it as follows, although it's still probably not as fast as the pack/unpack method:

join '.', map { hex } $ip =~ /../g;

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