http://noc.thethingsnetwork.org:8085/api/v2/gateways/core-electronics-sentrius-rg191 and the like.
See also http://noc.thethingsnetwork.org:8085/api/v2/gateways for the data of all gateways, and an example of some statistics from that list. And Can we still get statistics from all gateways and nodes?