D-Lib is an electronic journal which has been available since 1995. Many of the articles in D-Lib contain references that are accompanied by URLs. Of interest is how valid these URLs are after some time goes by. An analysis of all the references within D-Lib articles shows that 85% of the 5 1/2 years of references remain accessible. However, by plotting the % accessible against date of the article, it is clear that link rot increases with age.