AS3923 198.252.0.0/21 CIDR and IP Range Summary.ASN: 3923 - Federal Aviation AdministrationHost Count: 2046Addressable IPs: 2048198.252.0.0/24198.252.1.0/24198.252.2.0/24198.252.3.0/24198.252.4.0/24198.252.5.0/24198.252.6.0/24198.252.7.0/24