Hi,
Since there are some syntax errors in your Hash array I have modified your Hash array as: 
%host = (

  'ip1' => {
     'tcp' => {
        '21' => {
           'state' => 'open',
           'service' => 'ftp'
        },
        '80' => {
           'state' => 'open',
           'service' => 'web'
        }
      }
    },

  'ip2' => {
     'tcp' => {
        '23' => {
           'state' => 'open',
           'service' => 'telnet'
        },
       '80' => {
           'state' => 'open',
           'service' => 'web'
        }
      }
    }

);

[download]
You can use reference operator '->' to fetch complex datastructures and the code to display as per your requirement is as follows: 
foreach $ip (keys %host) {
    print $ip . "\n";
    foreach $type (keys %{$host{$ip}}) {
        foreach $no (keys %{$host{$ip}->{$type}}) {
            print " " . $no . "\t" . $host{$ip}->{$type}->{$no}->{'sta
+te'} . "\t" . $host{$ip}->{$type}->{$no}->{'service'} . "\n";
        }
    }
}

[download]
You can also add 53 open dns to "ip1" as: 
$host{'ip1'}->{'tcp'}->{53}->{'state'} = 'open';
$host{'ip1'}->{'tcp'}->{53}->{'service'} = 'dns';

[download]
Good Luck,
Hraj

Edited by planetscape - replaced <pre> with <code> tags

In reply to Re: lost in my data structure. by hraj
in thread lost in my data structure. by lepetitalbert

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.