AS17231 206.17.16.0/21 CIDR and IP Range Summary.ASN: 17231 - AT&T Enhanced Network ServicesHost Count: 2046Addressable IPs: 2048206.17.16.0/24206.17.17.0/24206.17.18.0/24206.17.19.0/24206.17.20.0/24206.17.21.0/24206.17.22.0/24206.17.23.0/24