United Kingdom

Number Code Allocated To Number Length Notes
01720 20xxxx Teledesign plc 4+6 F-Digit '2'
01720 21xxxx VoIP-Un Limited 4+6 F-Digit '0'
01720 22xxxx InTechnology Plc 4+6 F-Digit '2'
01720 23xxxx Telecom2 Ltd 4+6 F-Digit '6'
01720 24xxxx Timico Limited 4+6 F-Digit '8'
01720 25xxxx Telswitch Limited 4+6 F-Digit '0'
01720 26xxxx Nationwide Telephone Assistance Ltd 4+6 F-Digit '0'
01720 27xxxx Coralbridge Ltd 4+6 F-Digit '0'
01720 28xxxx Opal Telecom Limited 4+6 F-Digit '8'
01720 29xxxx Frontier Systems Ltd 4+6 F-Digit '3'
01720 30xxxx Telephony Services Limited 4+6 F-Digit '2'
01720 31xxxx Virgin Media Limited 4+6 F-Digit '4,5'
01720 32xxxx C3 Europe Limited 4+6 F-Digit '0'
01720 33xxxx Net Solutions Europe Limited 4+6 F-Digit '3'
01720 34xxxx Orange Home UK Plc 4+6 F-Digit '0'
01720 35xxxx TelNG Limited 4+6 F-Digit '2'
01720 36xxxx Localphone Limited 4+6 F-Digit '0'
01720 37xxxx Spitfire Network Services Ltd 4+6 F-Digit '7'
01720 38xxxx Skycom Ltd 4+6 F-Digit '2'
01720 39xxxx Inclarity plc 4+6 F-Digit '2'
01720 40xxxx BT 4+6
01720 40xxxx WWSCIL BT, Scillonia (Silly Isles) 4+6
01720 41xxxx Gamma Telecom Holdings Ltd 4+6
01720 42xxxx BT 4+6
01720 42xxxx WWSCIL BT, Scillonia (Silly Isles) 4+6
01720 43xxxx LogicStar Limited 4+6
01720 44xxxx Edge Telecom Ltd 4+6
01720 45xxxx Magrathea Telecommunications Limited 4+6
01720 46xxxx Danemere Street Creative 4+6
01720 47xxxx T.T.N.C. Limited 4+6 F-Digit '0,1,2,3,4,5,6,7,8,9'
01720 48xxxx FleXtel Limited 4+6
01720 49xxxx Net-Work Internet Ltd 4+6 F-Digit '0'
01720 50xxxx Voxbone SA 4+6 F-Digit '8'
01720 51xxxx Known Future Limited 4+6 F-Digit '0'
01720 52xxxx 3C Limited 4+6 F-Digit '2'
01720 53xxxx Solutios Limited 4+6 F-Digit '2'
01720 54xxxx O-Bit Telecom Limited 4+6 F-Digit '7'
01720 55xxxx IPV6 Limited 4+6 F-Digit '0'
01720 56xxxx Mars Communications Limited 4+6 F-Digit '0'
01720 57xxxx Instant Telecommunications Ltd 4+6 F-Digit '0'
01720 58xxxx Nexus Telecommunications plc 4+6 F-Digit '0'
01720 59xxxx Telecoms World Plc 4+6 F-Digit '0'
01720 60xxxx CFL Communications Limited 4+6 F-Digit '0'