AS7018 172.0.0.0/13 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 524286Addressable IPs: 524288172.0.0.0/16172.0.0.0/16172.0.0.0/16172.0.0.0/16172.0.0.0/16172.0.0.0/16172.0.0.0/16172.0.0.0/16