URLS

Set to 13 different clues across 20 published puzzles, most often “www addresses” — The New York Times, Tuesday, 3 July 2007.

4 letters

Every clue on record, most used first

www addresses5 times
The New York Times — Tuesday, 3 July 2007
Web addresses3 times
The New York Times — Tuesday, 17 March 2009
They may be bookmarked2 times
The New York Times — Thursday, 26 February 2009
Modern addresses, for shortonce
The New York Times — Wednesday, 27 January 2010
Bookmarked collectiononce
The New York Times — Friday, 14 November 2008
Google resultsonce
The New York Times — Sunday, 21 September 2008
Internet addressesonce
The New York Times — Tuesday, 1 April 2008
Addresses starting http://once
The New York Times — Tuesday, 17 April 2007
Modern addressesonce
The New York Times — Sunday, 4 February 2007
Some addressesonce
The New York Times — Saturday, 16 September 2006
Modern links, for shortonce
The New York Times — Thursday, 4 May 2006
Some modern addresses, for shortonce
The New York Times — Tuesday, 21 March 2006