This is not any of the answers people proposed here. It is a bot by whomever (government, hacker, etc.) trying to sniff or get into your network.
The MAC address is fake, so blocking it is a waste of time; it simply gets a new MAC address. If you try to investigate the hijacker, it will simply disappear for awhile, but it will return. This defensive mechanism is built into the monitoring code, deterring further investigation.
angler, full_biscuit ... fake Amazon or other phones ... It's all fake data. You know, the government has full access to all communication systems in the country. The link may not even be on your wireless network. It's probably coming over your LAN, bypassing all regulatory computer standards. The government and anyone else knowing this protocol can do it.
All networks are being monitored. Whether anyone has the time to analyze your data is questionable. I believe they are looking for key words, key pages, and flagging them.
Watch what you are doing on the internet. It's access in for someone who has the know-how. No firewall will prevent intrusion.
MS Computer Science
Website Manager and developer
Former Engineer: Bell Laboratories, Motorola, etc.