AS7018 12.21.144.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.21.144.0/2412.21.145.0/2412.21.146.0/2412.21.147.0/2412.21.148.0/2412.21.149.0/2412.21.150.0/2412.21.151.0/24