ABC: https://downdetector.com/status/abc-us/map/
CBS All Access: https://downdetector.com/status/cbs_all_access/map/
CNN: https://downdetector.com/status/cnn/map/
Fox News: https://downdetector.com/status/fox-news/map/
NBC News: https://downdetector.com/status/nbc-news/map/
Overview List: https://downdetector.com/archive/
Is downdetector reliable?
It appears to be so, but not my specialty. I just put all the links in one place. Hopefully those with knowledge will come share it.