Your cable box either has a modem inside, or uses your modem on a different channel to have internet access. I wouldn't worry about it though, I use it on a firestick, my phone on cellular, and at my daughter's place on her wifi, without issue. That's 3 differing IP addresses.
From its diagnostics screen, it appears each tuner has a DOCSIS. Wherever the requests are handed off to the Internet, Cox is metering it.
How were you able to use your firestick on your daughter's Wifi? I use a Google TV adapter and can't stream or cast Netflix using my brother's account. Do you use a VPN? Maybe because the IP's are close via Geolocation?
Nay she's on a different service all together, and I don't know, i just sigh in, whether it's my laptop, or I bring my firestick, or use my tablet or cell phone, I never have an issue using open witi, daughter's wifi, or mine!
You must be special because LOTS of people are having the same issue as me. Check out this thread. Have you tried it in the last month?
