Ownership of Fox and Ion
Fox is owned by Fox Entertainment via Fox Corporation and Ion is owned by Scripps Networks, LLC via E.W. Scripps Company.
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Fictional stuff seen in Futurama
Notable examples being the fictional ads seen in the start of several episodes but also Slurm.
Longest lasting logos for the Big Four US TV networks
The Big Four comprising of NBC, CBS, ABC and Fox. NBC's longest lasting logo was used from August 26, 1985 to September 30, 2013. CBS' longest lasting logo was used from 1966 to March 1, 2021. ABC's longest lasting logo was used from October 19, 1962 to September 10, 1988. Fox's longest lasting logo was used from September 1, 1999 to August 1, 2020.
Current idents for each of these US TV networks
The networks in question being NBC, CBS, ABC, PBS, Fox and the CW.