diff --git a/neinomat-gpn-kategorien b/neinomat-gpn-kategorien
new file mode 100755
index 0000000..328b042
--- /dev/null
+++ b/neinomat-gpn-kategorien
@@ -0,0 +1,33 @@
+#!/usr/bin/env ruby
+$:.unshift('vendor/ruby-mediawiki/lib')
+$:.unshift('vendor/htree')
+require 'mediawiki/dotfile'
+@wiki = MediaWiki.dotfile(nil,'entropia')
+
+def is_redirect?(title)
+  @wiki.article(title).text =~ /REDIRECT/
+end
+
+def check_category(title_re, category)
+  category_articles = @wiki.category(category).articles 
+  missing = []
+
+  @wiki.allpages.delete_if { |t| t !~ title_re }.each do |title|
+    if !is_redirect?(title) && !category_articles.member?(title)
+      missing << title
+    end
+  end
+
+  if missing.size > 0
+    puts "Folgenden Artikel fehlt die Kategorie: #{category}\n"
+    missing.each do |t|
+      puts t.chomp
+    end
+    puts
+  end
+end
+
+check_category(/GPN/, "GPN")
+(1..5).each do |n|
+  check_category(/GPN#{n}/, "GPN#{n}")
+end