Monitoring data use by IP or device

I have a C7100V running the latest firmware (ending in .23). Is there a way to monitor data usage by device or IP address? Lately my data usage as reported by Comcast has more than doubled and I would like to know what is using all that data. The router is connected via ethernet to a NAS, a PC, a streaming device (Amazon Fire TV) and a Plume wifi pod. The NAS is configured to not have cloud access and has local traffic only. I have not turned the PC on this month at all. The Plume reports total data at less than 10GB per day and our streaming is for around 4 hours per day. I would definitely like to know which device is using up all my data. Any help would be much appreciated.