Creating a custom "page not found" web page is the proper way of handling wrong or outdated web addresses. Give information to your users, use a simple design and tell your visitors that the URL does not exists any more.
"tell them that the page is not available anymore"
Please avoid to tell users that they are wrong or that they have a "bad" web address. Just tell them that the page is not available anymore and give them a link to your homepage.
Ikea, the furniture maker, has a simple, good looking and informative page not found web page design.
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On the other side, the Cartoon Network website does not have a customized 404 Not Found message. This could be very frustrating for users but it is also bad for the website business, I can imagine that many users don’t have idea what such a message means and they leave the site. Cartoon Network:
