USB to RJ45 octopus cables?

I have seen many USB to RS232 octopus cables, but do they make USB to RJ45?

I want to use a Raspberry Pi as a console server so I can console into up to 6 devices at once. I suppose I could just telnet/SSH (it is a private network without internet access) into them, but I will be reconfiguring the devices regularly and won't always have the devices configured for this.

Thanks!