What is the highest innings total in T20 international cricket?

Till date 263 runs is the highest innings total score in T20 Cricket. It was scored by Australian team against Sri Lanka in 2016. Second Highest innings score in T20 is 260 which was scored by Sri Lanka against Kenya in 2007.

Lowest innings total in T20 International cricket is 39. It was scored by Netherlands against Sri Lanka in 2014