Other features of the modem include IPv6 support, auto-negotiation, IPv4 support, and auto-uplink for users to take advantage of. The item "Lot of 50 Arris SURFboard SB6121 DOCSIS 3.0 Cable Modem Black" is in sale since Sunday, January 28, 2018. This item is in the category "Computers/Tablets & Networking\Home Networking & Connectivity\Modems". The seller is "aplera" and is located in Pomona, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Croatia.