AS3598 4.128.0.0/12 CIDR and IP Range Summary.ASN: 3598 - Microsoft CorporationHost Count: 1048574Addressable IPs: 10485764.128.0.0/164.129.0.0/164.130.0.0/164.131.0.0/164.132.0.0/164.133.0.0/164.134.0.0/164.135.0.0/164.136.0.0/164.137.0.0/164.138.0.0/164.139.0.0/164.140.0.0/164.141.0.0/164.142.0.0/164.143.0.0/16