Proofpoint, Inc. Proofpoint, Inc. AS22843
66.159.228.0 - 66.159.228.255
67.231.152.0 - 67.231.155.255
67.231.156.0 - 67.231.157.255
148.163.136.0 - 148.163.143.255
148.163.152.0 - 148.163.155.255
148.163.158.0 - 148.163.159.255
205.220.172.0 - 205.220.175.255
205.220.176.0 - 205.220.183.255
205.220.187.0 - 205.220.187.255
208.83.137.0 - 208.83.137.255
208.83.139.0 - 208.83.139.255
208.84.67.0 - 208.84.67.255
208.86.201.0 - 208.86.201.255