AS7018 66.139.16.0/21 CIDR and IP Range Summary.ASN: 7018 - AT&T Services Inc.Host Count: 2046Addressable IPs: 204866.139.16.0/2466.139.17.0/2466.139.18.0/2466.139.19.0/2466.139.20.0/2466.139.21.0/2466.139.22.0/2466.139.23.0/24