The Private Sniffer is similar to the Wireless Sniffer. However, if you were in a server, it would show only your wireless frequencies. The crafting recipes are also the same, however, you would use blaze rods instead of Obsidian Sticks. The Private Sniffer also notifies you if your frequency has been jammed. This is part of the Wireless Redstone Mod, by ChickenBones.