Also note that LoRa / LoRaWAN doesn't have an exhaustive list of channels - you can basically pick any frequency, provided that both the gateway and the node use the same channel and you comply with regulations.
The LoRaWAN spec has a few default channels defined, but also allows remotely configuring other channels (though no provision is specified for configuring the gateways). The TTN network has specified a number of channels that will be used as well (It's on the wiki), which mostly matches the default configuration of most gateways.