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SURFboard Cable Modems (dublin / pleasanton / livermore)
make / manufacturer:
Motorola/Arris
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SB6121 - Used on Comcast for many years. I started seeing strange behavior, so I bought a new modem. In the end, the strange behavior seemed to be related to something else, so this modem is likely still fine.
SB6183 - Never used. Basically new-old stock in its original box. I tested it once just to confirm it powers-up.
Both modems have recently been removed from Comcast/Xfinity supported list. So on-line activation may not be allowed. As mentioned, I was using the SB6121, but it was likely grandfathered on my account.
Both modems are free for pickup.