WordPress support pinging to Update Services to let search engines and other people know that you’ve updated your blog.  WordPress will automatically notifies Update Services that you’ve updated your blog by sending a XML-RPC ping each time you create or update a post. In turn, Update Services process the ping and updates their proprietary indices with your update. Now people browsing sites like Technorati or Sphere can find your most recent posts!

WordPress automatically notifies the specified update services in Settings ->Writing on Update Services section.

To use this list, copy and paste this list to your Settings -> Writing tab in the admin panel.

 http://www.a2b.cc/setloc/bp.a2b 
 http://1470.net/api/ping 
 http://a2b.cc/setloc/bp.a2b 
 http://api.feedster.com/ping 
 http://api.moreover.com/ping 
 http://api.moreover.com/RPC2 
 http://api.my.yahoo.co.jp/RPC2 
 http://api.my.yahoo.com/ping 
 http://api.my.yahoo.com/RPC2 
 http://api.my.yahoo.com/rss/ping 
 http://audiorpc.weblogs.com/RPC2 
 http://bblog.com/ping.php 
 http://bitacoles.net/notificacio.php 
 http://bitacoles.net/ping.php 
 http://bitacoras.net/ping 
 http://blo.gs/ping.php 
 http://blog.goo.ne.jp 
 http://blog.goo.ne.jp/XMLRPC 
 http://blogbot.dk/io/xml-rpc.php 
 http://blogdb.jp 
 http://blogdb.jp/xmlrpc 
 http://blogdigger.com/RPC2 
 http://blogmatcher.com/u.php 
 http://blogoole.com/ping/ 
 http://blogoon.net/ping/ 
 http://blogpeople.net/ping 
 http://blogroots.com/tb_populi.blog?id=1 
 http://blogsearch.google.ae/ping/RPC2 
 http://blogsearch.google.at/ping/RPC2 
 http://blogsearch.google.be/ping/RPC2 
 http://blogsearch.google.bg/ping/RPC2 
 http://blogsearch.google.ca/ping/RPC2 
 http://blogsearch.google.ch/ping/RPC2 
 http://blogsearch.google.cl/ping/RPC2 
 http://blogsearch.google.co.cr/ping/RPC2 
 http://blogsearch.google.co.hu/ping/RPC2 
 http://blogsearch.google.co.id/ping/RPC2 
 http://blogsearch.google.co.il/ping/RPC2 
 http://blogsearch.google.co.in/ping/RPC2 
 http://blogsearch.google.co.it/ping/RPC2 
 http://blogsearch.google.co.jp/ping/RPC2 
 http://blogsearch.google.co.ma/ping/RPC2 
 http://blogsearch.google.co.nz/ping/RPC2 
 http://blogsearch.google.co.th/ping/RPC2 
 http://blogsearch.google.co.uk/ping/RPC2 
 http://blogsearch.google.co.ve/ping/RPC2 
 http://blogsearch.google.co.za/ping/RPC2 
 http://blogsearch.google.com.ar/ping/RPC2 
 http://blogsearch.google.com.au/ping/RPC2 
 http://blogsearch.google.com.br/ping/RPC2 
 http://blogsearch.google.com.co/ping/RPC2 
 http://blogsearch.google.com.do/ping/RPC2 
 http://blogsearch.google.com.mx/ping/RPC2 
 http://blogsearch.google.com.my/ping/RPC2 
 http://blogsearch.google.com.pe/ping/RPC2 
 http://blogsearch.google.com.sa/ping/RPC2 
 http://blogsearch.google.com.sg/ping/RPC2 
 http://blogsearch.google.com.tr/ping/RPC2 
 http://blogsearch.google.com.tw/ping/RPC2 
 http://blogsearch.google.com.ua/ping/RPC2 
 http://blogsearch.google.com.uy/ping/RPC2 
 http://blogsearch.google.com.vn/ping/RPC2 
 http://blogsearch.google.com/ping/RPC2 
 http://blogsearch.google.com/ping/RPC2 
 http://blogsearch.google.com/ping/RPC2 
 http://blogsearch.google.de/ping/RPC2 
 http://blogsearch.google.es/ping/RPC2 
 http://blogsearch.google.fi/ping/RPC2 
 http://blogsearch.google.fr/ping/RPC2 
 http://blogsearch.google.gr/ping/RPC2 
 http://blogsearch.google.hr/ping/RPC2 
 http://blogsearch.google.ie/ping/RPC2 
 http://blogsearch.google.in/ping/RPC2 
 http://blogsearch.google.it/ping/RPC2 
 http://blogsearch.google.jp/ping/RPC2 
 http://blogsearch.google.lt/ping/RPC2 
 http://blogsearch.google.nl/ping/RPC2 
 http://blogsearch.google.pl/ping/RPC2 
 http://blogsearch.google.pt/ping/RPC2 
 http://blogsearch.google.ro/ping/RPC2 
 http://blogsearch.google.ru/ping/RPC2 
 http://blogsearch.google.se/ping/RPC2 
 http://blogsearch.google.sk/ping/RPC2 
 http://blogsearch.google.tw/ping/RPC2 
 http://blogsearch.google.us/ping/RPC2 
 http://blogshares.com/rpc.php 
 http://blogsnow.com/ping 
 http://blogstreet.com/xrbin/xmlrpc.cgi 
 http://blogupdate.org/ping/ 
 http://bulkfeeds.net 
 http://bulkfeeds.net/rpc 
 http://catapings.com/ping.php 
 http://coreblog.org/ping 
 http://effbot.org/rpc/ping.cgi 
 http://feedsky.com/api/RPC2 
 http://fgiasson.com/pings/ping.php 
 http://hamo-search.com/ping.php 
 http://holycowdude.com/rpc/ping/ 
 http://imblogs.net/ping/ 
 http://lasermemory.com/lsrpc/ 
 http://mod-pubsub.org 
 http://mod-pubsub.org/kn_apps/blogchatt 
 http://mod-pubsub.org/knapps/blogchatt 
 http://mod-pubsub.org/ping.php 
 http://newsblog.jungleboots.org/ping.php 
 http://newsisfree.com/RPCCloud 
 http://packetmonster.net/xmlrpc.php 
 http://ping.amagle.com 
 http://ping.amagle.com/ 
 http://ping.bitacoras.com 
 http://ping.bitacoras.com 
 http://ping.blo.gs 
 http://ping.blogg.de/ 
 http://ping.bloggers.jp/rpc 
 http://ping.blogoon.net/ 
 http://ping.blogs.yandex.ru/RPC2 
 http://ping.cocolog-nifty.com/xmlrpc 
 http://ping.exblog.jp/xmlrpc 
 http://ping.fakapster.com/rpc 
 http://ping.fc2.com/ 
 http://ping.feedburner.com 
 http://ping.feeds.yahoo.com/RPC2/ 
 http://ping.kutsulog.net/ 
 http://ping.myblog.jp 
 http://ping.namaan.net/rpc 
 http://ping.rootblog.com/rpc.php 
 http://ping.snap.com/ping/RPC2 
 http://ping.syndic8.com/xmlrpc.php 
 http://ping.weblogalot.com/rpc.php 
 http://ping.weblogs.se 
 http://ping.wordblog.de/ 
 http://pinger.blogflux.com/rpc 
 http://pingoat.com/ 
 http://pingoat.com/goat/RPC2 
 http://pingqueue.com/rpc/ 
 http://popdex.com/addsite.php 
 http://r.hatena.ne.jp/rpc 
 http://rcs.datashed.net 
 http://rcs.datashed.net/RPC2 
 http://rpc.blogbuzzmachine.com/RPC2 
 http://rpc.bloggerei.de/ping/ 
 http://rpc.blogrolling.com/pinger 
 http://rpc.britblog.com/ 
 http://rpc.icerocket.com:10080 
 http://rpc.newsgator.com/ 
 http://rpc.pingomatic.com 
 http://rpc.reader.livedoor.com/ping 
 http://rpc.tailrank.com/feedburner/RPC2 
 http://rpc.technorati.com/rpc/ping 
 http://rpc.twingly.com 
 http://rpc.weblogs.com/RPC2 
 http://rpc.wpkeys.com 
 http://services.newsgator.com/ngws/xmlrpcping.aspx 
 http://signup.alerts.msn.com/alerts-PREP/submitPingExtended.doz 
 http://snipsnap.org/RPC2 
 http://syndic8.com/xmlrpc.php 
 http://thingamablog.sourceforge.net/ping.php 
 http://topicexchange.com 
 http://topicexchange.com/RPC2 
 http://trackback.bakeinu.jp/bakeping.php 
 http://wasalive.com/ping/ 
 http://weblogues.com/ping/ 
 http://weblogues.com/RPC/ 
 http://www.a2b.cc 
 http://www.a2b.cc/setloc/bp.a2b 
 http://www.bitacoles.net/ping.php 
 http://www.blogdigger.com/RPC2 
 http://www.bloglines.com/ping 
 http://www.blogoole.com/ping/ 
 http://www.blogoon.net/ping 
 http://www.blogpeople.net 
 http://www.blogpeople.net/servlet/weblogUpdates 
 http://www.blogroots.com 
 http://www.blogroots.com/tb_populi.blog?id=1 
 http://www.blogroots.com/tbpopuli.blog?id=1 
 http://www.blogsdominicanos.com/ping/ 
 http://www.blogshares.com/rpc.php 
 http://www.blogsnow.com/ping 
 http://www.blogstreet.com/xrbin/xmlrpc.cgi 
 http://www.catapings.com/ping.php 
 http://www.feedsky.com/api/RPC2 
 http://www.holycowdude.com/rpc/ping/ 
 http://www.imblogs.net/ping/ 
 http://www.lasermemory.com 
 http://www.lasermemory.com/lsrpc 
 http://www.mod-pubsub.org/kn_apps/blogchatter/ping.php 
 http://www.mod-pubsub.org/knapps/blogchatter/ping.php 
 http://www.mod-pubsub.org/ping.php 
 http://www.newsisfree.com/RPCCloud 
 http://www.newsisfree.com/xmlrpctest.php 
 http://www.octora.com/add_rss.php 
 http://www.popdex.com 
 http://www.popdex.com/addsite.php 
 http://www.snipsnap.org 
 http://www.snipsnap.org/RPC2 
 http://www.wasalive.com/ping/ 
 http://www.weblogues.com 
 http://www.weblogues.com/RPC 
 http://www.xianguo.com/xmlrpc/ping.php 
 http://www.zhuaxia.com/rpc/server.php 
 http://xmlrpc.blogg.de 
 http://xping.pubsub.com/ping 
 http://zhuaxia.com/rpc/server.php 
 http://zing.zingfast.com