What is the broadcast address for the subnet 190.86.168.0/22?

190.86.168.255 is the broadcast for the smaller 190.86.168.0/24 subnet, not the larger /22 block.

190.86.255.255 would be the broadcast for a /16 block starting at 190.86.0.0, which is a much larger range.

A /22 prefix leaves 10 host bits (32 - 22 = 10) and a subnet mask of 255.255.252.0. Starting at 190.86.168.0, the host portion spans the last 2 bits of the third octet (allowing values 168-171) and all 8 bits of the fourth octet. Setting all host bits to 1 yields a third octet of 171 (10101011) and fourth octet of 255, producing broadcast address 190.86.171.255.

190.86.169.255 is the broadcast for 190.86.169.0/24, a subnet that falls inside the /22 range but is not the final broadcast address.