YES it works with Optimum Online, I just connected mine on January 5th, 2020 in Westchester, NY. Do yourself a favor and save some money by NOT renting their equipment, this modem is tiny compared to Optimal. I called tech support, put the MAC address (number) on the bottom of the modem and that's it! Everything is online again! I bought a refurbished modem and bought a 4 year extended warranty for an additional $6, it was worth it. PS: This modem does not have a phone line, to save more, buy a Polycom OBI200 and that's it, you have a phone line! :)
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