- Note: These are regular expressions; edit with care!
Known Wikipedia mirrors
www.aadet.com/ \.answers\.com/ \.search\.com/ \.referenceencyclopedia\.com/ \.reference\.com/ \.wikipedia\.com/ \.wikipedia\.org/ \.mirrorpedia\.com/ \.brainyencyclopedia\.com/ \.babylon\.com/ \.bibleocean\.com/ \.?medlibrary\.org/ \.allexperts\.com/ \.reference\.com/ \.feedbus\.com/ \.?pandapedia\.com/wiki/ \.?tubious\.com/ www.pontefract-yfc.co.uk/wiki.php www\.territorioscuola\.com/wiki/ \.?otovaganza\.com/minicooper-old\.php \.?net-encyclo\.com/en/ \.?prescriptiondrug-info\.com/ \.?wikivotr\.com/ \.?jgames\.co\.uk/title/ \.?allrss\.com/wikipedia\.php\? india\.smashits\.com/wikipedia/ \.citizendia\.org/ \.?s2008\.info/ \.?moralnafirma\.pl/ \.?boopsie.com/ www.thepaleochorasite.com/wiki/ \.fotopedia\.com/ \.?reachinformation.com/define/ yomi\.mobi/egate/ pediaview\.com/ wikipedia\.7val\.de www.wikiwak.com/ \.fiveafrica\.com/ \.freebase\.com/ \.juggle\.com/ \.barcodinglife\.com/ danpritchard.com/wiki/ \.aadet\.com www\.absoluteastronomy\.com/topics/ en\.goldenmap\.com/ \.maps\.thefullwiki\.org/ \.www\.askbiography\.com/ \.tutorgig\.info
wiki\.verkata\.com
Known U.S. Government sites
\.gov/ \.mil/
Sites with CC-BY-SA-compatible contents
\.citizendium\.org/ \.?bhamwiki\.com/ \.?gardenology.org/ \.wikimedia\.org/ \.wikisource\.org/ \.wiktionary\.org/ \.wikia.com/ \.?planetmath\.org/ www\.libraryireland\.com/biography/ \.?appropedia.org/ www\.animalbase\.uni-goettingen\.de/zooweb/servlet/AnimalBase/?
Sites with explicit permission
www\.interface1\.net/ \.govtrack\.us/ www\.patents\.com/us