Based on the naming convention, that's a sub-channel of one of your local broadcast networks. I recently noticed a similar issue on Time Warner in Ohio. The local CBS affiliate has a sub-channel that broadcasts AntennaTV. This has been in the lineup as channel 372 for years and was not part of the channels received for my Cable package. I recently had a guide change that added channel 996, but without any guide information for the last 2 weeks. A little research and I learned it is the local AntennaTV sub channel that used to be at 372, but now I'm authorized to receive it.
These are line-up issues with the Guide provider, Tribune Media Services, and should be reported here