LightowerOptical Carrier / Fiber to the end user6955LightpathOptical Carrier / Fiber to the end user898Charter Communications Inc.Optical Carrier / Fiber to the end user708Level 3 Communications, LLCOptical Carrier / Fiber to the end user672PAETEC Communications, Inc.Optical Carrier / Fiber to the end user321Cogent CommunicationsOptical Carrier / Fiber to the end user202Zayo Group, LLCOptical Carrier / Fiber to the end user138PAETEC Business ServicesOptical Carrier / Fiber to the end user87US LEC Communications, LLCOptical Carrier / Fiber to the end user87SpectrotelOptical Carrier / Fiber to the end user64MCIOptical Carrier / Fiber to the end user22InterGlobeOptical Carrier / Fiber to the end user16Brooklyn FiberOptical Carrier / Fiber to the end user8Telefonica USAOptical Carrier / Fiber to the end user6RGSIOptical Carrier / Fiber to the end user5NetFortrisOptical Carrier / Fiber to the end user3Orange Business Services U.S., Inc.Optical Carrier / Fiber to the end user3ComcastCable Modem-DOCSIS 3.02McLeodUSA Telecommunications Services, L.L.C.Optical Carrier / Fiber to the end user2QCSTelecomOptical Carrier / Fiber to the end user2TierzeroOptical Carrier / Fiber to the end user2Zayo Enterprise NetworksOptical Carrier / Fiber to the end user2Block LineOptical Carrier / Fiber to the end user1Call One Inc.Optical Carrier / Fiber to the end user1TransbeamOptical Carrier / Fiber to the end user1