AS5400 62.172.0.0/21 CIDR and IP Range Summary.ASN: 5400 - British Telecommunications PLCHost Count: 2046Addressable IPs: 204862.172.0.0/2462.172.1.0/2462.172.2.0/2462.172.3.0/2462.172.4.0/2462.172.5.0/2462.172.6.0/2462.172.7.0/24