49 lines
916 B
Plaintext
49 lines
916 B
Plaintext
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#!/usr/bin/perl
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use warnings;
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use strict;
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my $min = 0xFFFF_FFFF;
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my $max = 0x0000_0000;
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for (@ARGV) {
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if (/(\d+)\.(\d+)\.(\d+)\.(\d+)/) {
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my $adr = $1 * 0x100_0000 + $2 * 0x1_0000 + $3 * 0x100 + $4;
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$max = $adr if ($adr > $max);
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$min = $adr if ($adr < $min);
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}
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}
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my $diff = $min ^ $max;
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# printf "min = %08x max = %08x diff = %08x\n", $min, $max, $diff;
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my $netmaskbits = 32;
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my $netmask = 0xFFFF_FFFF;
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while ($diff > 0) {
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$netmaskbits--;
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$diff >>= 1;
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$netmask <<= 1;
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}
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my $net = $min & $netmask;
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my $bcast = $min | ~$netmask;
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printf "net = %s/%d (%s/%s) bcast = %s\n",
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dottedquad($net),
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$netmaskbits,
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dottedquad($net),
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dottedquad($netmask),
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dottedquad($bcast);
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sub dottedquad {
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my ($adr) = @_;
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return sprintf "%d.%d.%d.%d",
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($adr >> 24) & 0xFF,
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($adr >> 16) & 0xFF,
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($adr >> 8) & 0xFF,
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($adr >> 0) & 0xFF;
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}
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exit(0);
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