http://mat.i2p/internet-roadtrip-pathfinder
Their IDs are always 22 random characters and look like this: VobQPxcTuq- BehdH4uPMPg . The IDs can always be URL- safe- base64- decoded to 16 bytes (if you add padding), which means that the IDs must end with either g , w , A , or Q . The second type are a bit weird.