This paper present the design and function of magiran.com, a databse of periodicals published in Iran. It also attempts to answer the following questions: How many of the total periodicals published in Iran are covered by magiran? What is the subject coverage of the periodicals covered? Which subjects seem to have been given importance among the periodicals covered? How many of the periodicals are available full text? What is the subject coverage of the periodicals available full text? What are the languages of the periodicals covered? How many of the periodicals accredited by MSRT are found in magiran? What is the subject coverage of the accredited periodicals? Which subjects seem to have been given importance among the accredited periodicals covered? How is the general structure of the site in terms of colors, icons, pull-down windows, and so on?