United Kingdom

Number Code Allocated To Number Length Notes
01581 20xxxx BT 4+6
01581 21xxxx Frontier Systems Ltd 4+6 F-Digit '3'
01581 22xxxx Teledesign plc 4+6 F-Digit '2'
01581 23xxxx Coralbridge Ltd 4+6 F-Digit '0'
01581 24xxxx InTechnology Plc 4+6 F-Digit '2'
01581 25xxxx VoIP-Un Limited 4+6 F-Digit '0'
01581 26xxxx Telephony Services Limited 4+6 F-Digit '2'
01581 27xxxx O-Bit Telecom Limited 4+6 F-Digit '7'
01581 28xxxx Opal Telecom Limited 4+6 F-Digit '8'
01581 29xxxx Telecom2 Ltd 4+6 F-Digit '6'
01581 30xxxx BT 4+6
01581 31xxxx Timico Limited 4+6 F-Digit '8'
01581 32xxxx Telswitch Limited 4+6 F-Digit '0'
01581 33xxxx Net-Work Internet Ltd 4+6 F-Digit '3'
01581 34xxxx Voxbone SA 4+6 F-Digit '8'
01581 35xxxx Known Future Limited 4+6 F-Digit '0'
01581 36xxxx Solutios Limited 4+6 F-Digit '2'
01581 37xxxx IPV6 Limited 4+6 F-Digit '0'
01581 38xxxx Mars Communications Limited 4+6 F-Digit '0'
01581 39xxxx Instant Telecommunications Ltd 4+6 F-Digit '0'
01581 40xxxx BT 4+6
01581 41xxxx Nexus Telecommunications plc 4+6 F-Digit '0'
01581 42xxxx Mundio Mobile Limited 4+6 F-Digit '6'
01581 43xxxx CFL Communications Limited 4+6 F-Digit '0'
01581 44xxxx Danemere Street Creative 4+6 F-Digit '2'
01581 50xxxx BT 4+6
01581 51xxxx C3 Europe Limited 4+6 F-Digit '1'
01581 52xxxx Inclarity plc 4+6 F-Digit '2'
01581 53xxxx Virgin Media Limited 4+6 F-Digit '4,5'
01581 54xxxx T.T.N.C. Limited 4+6 F-Digit '0,1,2,3,4,5,6,7,8,9'
01581 55xxxx Net Solutions Europe Limited 4+6 F-Digit '5'
01581 56xxxx Orange Home UK Plc 4+6 F-Digit '0'
01581 57xxxx Spitfire Network Services Ltd 4+6 F-Digit '7'
01581 58xxxx TelNG Limited 4+6 F-Digit '2'
01581 59xxxx Localphone Limited 4+6 F-Digit '0'
01581 60xxxx BT 4+6
01581 61xxxx Cable and Wireless (Energis) 4+6
01581 62xxxx BT 4+6
01581 63xxxx Magrathea Telecommunications Limited 4+6
01581 64xxxx LogicStar Limited 4+6
01581 65xxxx Gamma Telecom Holdings Ltd 4+6
01581 66xxxx Edge Telecom Ltd 4+6
01581 67xxxx FleXtel Limited 4+6
01581 68xxxx Skycom Ltd 4+6 F-Digit '2'
01581 69xxxx Syntec UK Ltd 4+6