United Kingdom

Number Code Allocated To Number Length Notes
01721 20xxxx Freshtel UK Limited 4+6
01721 21xxxx IV Response Limited 4+6
01721 22xxxx FleXtel Limited 4+6
01721 23xxxx Virgin Media Limited 4+6 F-Digit '4,5'
01721 24xxxx Inclarity plc 4+6 F-Digit '2'
01721 25xxxx Net Solutions Europe Limited 4+6 F-Digit '5'
01721 26xxxx C3 Europe Limited 4+6 F-Digit '1'
01721 27xxxx Telephony Services Limited 4+6 F-Digit '2'
01721 28xxxx Orange Home UK Plc 4+6 F-Digit '0'
01721 29xxxx TelNG Limited 4+6 F-Digit '2'
01721 30xxxx Coralbridge Ltd 4+6 F-Digit '0'
01721 31xxxx Nationwide Telephone Assistance Ltd 4+6 F-Digit '0'
01721 32xxxx Telecom2 Ltd 4+6 F-Digit '6'
01721 33xxxx Net-Work Internet Ltd 4+6 F-Digit '3'
01721 34xxxx Timico Limited 4+6 F-Digit '8'
01721 35xxxx Telswitch Limited 4+6 F-Digit '0'
01721 36xxxx Voxbone SA 4+6 F-Digit '8'
01721 37xxxx Starcomm Ltd 4+6 F-Digit '0'
01721 38xxxx 3C Limited 4+6 F-Digit '2'
01721 39xxxx Known Future Limited 4+6 F-Digit '6'
01721 40xxxx INET Telecoms Ltd (Voipfone) 4+6 F-Digit '0'
01721 41xxxx Solutios Limited 4+6 F-Digit '2'
01721 42xxxx IPV6 Limited 4+6 F-Digit '0'
01721 43xxxx Nexus Telecommunications plc 4+6 F-Digit '0'
01721 44xxxx Instant Telecommunications Ltd 4+6 F-Digit '0'
01721 45xxxx Mars Communications Limited 4+6 F-Digit '0'
01721 46xxxx Telecoms World Plc 4+6 F-Digit '0'
01721 47xxxx Mundio Mobile Limited 4+6 F-Digit '6'
01721 48xxxx CFL Communications Limited 4+6 F-Digit '0'
01721 49xxxx Danemere Street Creative 4+6 F-Digit '2'
01721 50xxxx Cable and Wireless (Energis) 4+6
01721 51xxxx Syntec UK Ltd 4+6
01721 52xxxx T.T.N.C. Limited 4+6 F-Digit '0,1,2,3,4,5,6,7,8,9'
01721 53xxxx Skycom Ltd 4+6 F-Digit '2'
01721 54xxxx Gamma Telecom Holdings Ltd 4+6
01721 55xxxx Localphone Limited 4+6 F-Digit '0'
01721 56xxxx Frontier Systems Ltd 4+6 F-Digit '3'
01721 57xxxx Spitfire Network Services Ltd 4+6 F-Digit '7'
01721 58xxxx Opal Telecom Limited 4+6 F-Digit '8'
01721 59xxxx LogicStar Limited 4+6
01721 63xxxx VoIP-Un Limited 4+6 F-Digit '0'
01721 64xxxx O-Bit Telecom Limited 4+6
01721 65xxxx InTechnology Plc 4+6 F-Digit '2'
01721 68xxxx BT 4+6
01721 68xxxx ESPEB BT, Peebles (Borders) 4+6
01721 70xxxx Cable & Wireless UK 4+6
01721 71xxxx Thus Plc 4+6
01721 72xxxx BT 4+6
01721 72xxxx ESPEB BT, Peebles (Borders) 4+6
01721 73xxxx BT 4+6
01721 73xxxx ESEDD BT, Eddleston (Borders) 4+6
01721 74xxxx BT 4+6
01721 74xxxx ESKKM BT, Kirkton Manor (Borders) 4+6
01721 75xxxx BT 4+6
01721 75xxxx ESDRO BT, Drochil Castle (Borders) 4+6
01721 76xxxx BT 4+6
01721 76xxxx ESSTO BT, Stobo (Borders) 4+6
01721 77xxxx Teledesign plc 4+6 F-Digit '2'
01721 78xxxx Magrathea Telecommunications Limited 4+6
01721 79xxxx Edge Telecom Ltd 4+6