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Re: IP addresses

by jwest (Friar)
on May 19, 2005 at 14:32 UTC ( #458629=note: print w/replies, xml ) Need Help??

in reply to IP addresses

Generally, to determine the list of IP addresses associated with a given network, you should consider using Net::Netmask:

use strict; use warnings; use Net::Netmask; my $spec = ...; my $block = Net::Netmask->new2($spec) or die "bad spec"; my $base = $block->base; my $bcast = $block->broadcast; my @ip = $block->enumerate; for (@ip) { next if @ip > 1 and $_ eq $base; next if @ip > 1 and $_ eq $bcast; ... }
See the perldoc for Net::Netmask to see how the network block may be specified. You'll find that it accepts the most intuitive methods.


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[pryrt]: 1nickt, sprintf "%.16e", $v will always give enough precision to see 1 ULP (the smallest fractional part) of a standard 64bit Perl NV*
[pryrt]: (*: for systems where $Config{nvsize}==8 )
[pryrt]: Thus, that's "enough precision" to tell the difference between 1.0 and 1.0+1ULP
[pryrt]: But in what circumstance does your problem arise? When, in Perl, does the integer 1 not work identically to the floating-point NV 1.0000000000000000 e0?

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