AS5400 212.31.200.0/21 CIDR and IP Range Summary.ASN: 5400 - British Telecommunications PLCHost Count: 2046Addressable IPs: 2048212.31.200.0/24212.31.201.0/24212.31.202.0/24212.31.203.0/24212.31.204.0/24212.31.205.0/24212.31.206.0/24212.31.207.0/24