5566应该是备用的端口，没有分配有作用的
详细的常见的UDP端口如下：
UDP 9=Chargen
UDP 19=Chargen
//UDP 135=Netbios Remote procedure call
//UDP 137=Netbios name (DoS attacks)
//UDP 138=Netbios datagram
//UDP 139=Netbios session (DoS attacks)
UDP 1025=Maverick's Matrix 1.2 - 2.0
UDP 1349=BO dll
UDP 2140=Deep Throat
UDP 2989=RAT
UDP 3150=Deep Throat
UDP 3801=Eclypse
UDP 5503=Remote Shell Trojan
UDP 6112= Game(不是木马)
UDP 6838=Mstream Agent-handler
UDP 7028=未知木马
UDP 7983=MStream handler-agent
UDP 8787=BackOrifice 2000
UDP 8879=BackOrifice 2000
UDP 9325=MStream Agent-handler
UDP 10067=Portal of Doom
UDP 10167=Portal of Doom
UDP 12378=W32/Gibe@MM
UDP 18753=Shaft handler to Agent
UDP 21554=GirlFriend
UDP 22784=uzzo
UDP 26274=Delta Source
UDP 26374=Sub-7 2.1
UDP 26444=Trin00/TFN2K
UDP 26573=Sub-7 2.1
UDP 29891=The Unexplained
UDP 31335=Trin00 DoS Attack
UDP 31337=Baron Night， BO client， BO2， Bo Facil， BackFire， Back Orifice， DeepBO
