AS2856 217.45.16.0/21 CIDR and IP Range Summary.ASN: 2856 - British Telecommunications PLCHost Count: 2046Addressable IPs: 2048217.45.16.0/24217.45.17.0/24217.45.18.0/24217.45.19.0/24217.45.20.0/24217.45.21.0/24217.45.22.0/24217.45.23.0/24