{"id":8,"date":"2007-06-05T17:14:39","date_gmt":"2007-06-05T22:14:39","guid":{"rendered":"http:\/\/www.popmartian.com\/tipsntricks\/2007\/06\/05\/perl-code-to-find-an-ip-a-in-subnet-bc\/"},"modified":"2008-10-22T16:55:20","modified_gmt":"2008-10-22T21:55:20","slug":"perl-code-to-find-an-ip-a-in-subnet-bc","status":"publish","type":"post","link":"https:\/\/www.popmartian.com\/tipsntricks\/2007\/06\/05\/perl-code-to-find-an-ip-a-in-subnet-bc\/","title":{"rendered":"Perl code to find an IP A in subnet B\/C"},"content":{"rendered":"<pre>\r\nmy $ip = '1.2.3.4';\r\nmy $block1 = '1.2.3.0\/27';\r\n\r\nif(checkip($ip, $block1)) {\r\n    print STDOUT \"$ip is in $block1\\n\";\r\n}\r\nelse {\r\n    print STDOUT \"$ip is not in $block1\\n\";\r\n}\r\n\r\nsub checkip() {\r\n    my $ip = shift;\r\n    my $block = shift;\r\n    \r\n    @ip1 = split(\/\\.\/, $ip);\r\n    $ip1 = $ip1[0] * 2**24 + $ip1[1] * 2**16 + $ip1[2] * 2**8 + $ip1[3];\r\n    my @temp = split(\/\\\/\/, $block);\r\n    \r\n    $ip2 = $temp[0];\r\n    my $netmask = $temp[1];\r\n    \r\n    @ip2 = split(\/\\.\/, $ip2);\r\n    $ip2 = $ip2[0] * 2**24 + $ip2[1] * 2**16 + $ip2[2] * 2**8 + $ip2[3];\r\n    \r\n    if( $ip1 >> (32-$netmask) == $ip2 >> (32-$netmask) ) {\r\n            return 1;\r\n    }\r\n    return 0;\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>my $ip = &#8216;1.2.3.4&#8217;; my $block1 = &#8216;1.2.3.0\/27&#8217;; if(checkip($ip, $block1)) { print STDOUT &#8220;$ip is in $block1\\n&#8221;; } else { print STDOUT &#8220;$ip is not in $block1\\n&#8221;; } sub checkip() { my $ip = shift; my $block = shift; @ip1 &hellip; <a href=\"https:\/\/www.popmartian.com\/tipsntricks\/2007\/06\/05\/perl-code-to-find-an-ip-a-in-subnet-bc\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,14,15,13,12,9],"tags":[],"class_list":["post-8","post","type-post","status-publish","format-standard","hentry","category-how-to-do-stuff","category-ip-addressing","category-ipv4","category-networking","category-perl","category-programming"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/posts\/8","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/comments?post=8"}],"version-history":[{"count":4,"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/posts\/8\/revisions"}],"predecessor-version":[{"id":66,"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/posts\/8\/revisions\/66"}],"wp:attachment":[{"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/media?parent=8"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/categories?post=8"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.popmartian.com\/tipsntricks\/wp-json\/wp\/v2\/tags?post=8"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}