I've got a Netgear DG834G running firmware V5.01.01. From the LAN side, if I port scan it, it's listening on tcp port 32764. Trying to telnet into this port gives me the response
MMcS\xff\xff\xff\xff\0\0\0\0 (in hex, obviously).
I've got UPnP disabled, it's not a remote management port, and it's not open on the WAN side. I can't find anything in Netgear's documentation, and searching online doesn't find anything either. A few people seem to have noticed, but no one actually has an answer. I've also created a firewall rule blocking outbound access to that port, and it's still open, so it's actually the router that's listening on it.
Does anyone know what this could be?