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จากบทความ Who Has the Most Web Servers? จาก datacenterknowledge.com
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DataCenter

• 1&1 Internet: 55,000 servers (company)
• OVH: 55,000 servers (company)
• Rackspace: 50,038 servers (company)
• The Planet: 48,500 servers (company)
• Akamai Technologies: 48,000 servers (company)
• SBC Communications: 29,193 servers (Netcraft)
• Verizon: 25,788 servers (Netcraft)
• Time Warner Cable: 24,817 servers (Netcraft)
• SoftLayer: 21,000 servers (company)
• AT&T: 20,268 servers (Netcraft)
• Peer1/ServerBeach: 10,277 servers (company)
• iWeb: 10,000 servers (company)

Companies

• Google 450,000 servers
• Microsoft 218,000 servers
• Yahoo 50,000 servers
• EP/EDS 380,000 servers
• FaceBook > 10,000 servers
• Akamai 48,000 servers
• OVH (France) 55,102 servers
• Salesforce 1,000 servers (ส่วนใหญ่ วางไว้ที่ Equinix)

อ่ะของแถม

World class Data Center lists

: GNAX/Global Net Crossing, MAE east/west/south, CalPOP, PAIX, Akamai, Level3 (L3’s san diego POP alone is around 150k servers), Choopa, Pair, Xilogix, Inflow Atlanta, the semi-missed McColo, Peer1, FDCServers, KIO, AlphaRed, OCIE, US Data Port, Latisys, SuperNAP, Dallas Data Center, ThePlanet, Phoenix ONE, EV1, SoftLayer, NetApp, NevadaNap, Finland OY, NetMagic, iAdvantage, 3Tera, et cetera.

Links
Who Has the Most Web Servers?
Netcraft Hosting Provider Server Count

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ผมศึกษา Facebook อยู่ครับ ไม่นึกเลยว่าใช้ Server มากกว่า 10,000