AS7018 12.21.200.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204812.21.200.0/2412.21.201.0/2412.21.202.0/2412.21.203.0/2412.21.204.0/2412.21.205.0/2412.21.206.0/2412.21.207.0/24