AS5400 212.163.40.0/21 CIDR and IP Range Summary.ASN: 5400 - British Telecommunications PLCHost Count: 2046Addressable IPs: 2048212.163.40.0/24212.163.41.0/24212.163.42.0/24212.163.43.0/24212.163.44.0/24212.163.45.0/24212.163.46.0/24212.163.47.0/24