AS3300 63.250.136.0/21 CIDR and IP Range Summary.ASN: 3300 - British Telecommunications PLCHost Count: 2046Addressable IPs: 204863.250.136.0/2463.250.137.0/2463.250.138.0/2463.250.139.0/2463.250.140.0/2463.250.141.0/2463.250.142.0/2463.250.143.0/24