Did Satan know Jesus was the Messiah?

Yes, ALL the demons knew Jesus to be the 'Christ'(Messiah)(Luke 4:41)(Mark 1:24+34)(Luke 4:34) (Matthew 8:29)(Acts 19:15) which is why Satan(the 'god of this world'(John 14:30)(Ephesians 2:2)(1 John 5:19)) worked so hard to stumble him(Matthew 3:16-4:11)(Genesis 3:15/Revelation 12:9-12)and continues to block the minds of unbelievers even today(2 Corinthians 4:3-4). In fact, they have known each other since 'the beginning'(John 8:42-44)and one of the reasons Jesus was sent was to 'break up the works of the devil'(1 John 3:8).