United Kingdom

Number Code Allocated To Number Length Notes
01423 200xxx Nationwide Telephone Assistance Ltd 4+6
01423 201xxx Coralbridge Ltd 4+6
01423 202xxx Opal Telecom Limited 4+6
01423 203xxx Tiscali UK Limited 4+6
01423 204xxx 3C Limited 4+6
01423 205xxx Voxbone SA 4+6
01423 206xxx INET Telecoms Ltd (Voipfone) 4+6
01423 207xxx Known Future Limited 4+6
01423 208xxx Invomo Ltd 4+6
01423 21xxxx Edge Telecom Ltd 4+6 F-Digit '0'
01423 22xxxx Gamma Telecom Holdings Ltd 4+6
01423 23xxxx Starcomm Ltd 4+6
01423 24xxxx LogicStar Limited 4+6 F-Digit '0'
01423 250xxx TG Support Limited 4+6
01423 251xxx Freshtel UK Limited 4+6
01423 252xxx C3 Europe Limited 4+6
01423 253xxx TELSTRA EUROPE LIMITED 4+6
01423 254xxx Net Solutions Europe Limited 4+6
01423 255xxx VTL (UK) Limited 4+6
01423 256xxx Digital Mail Limited 4+6
01423 257xxx FleXtel Limited 4+6
01423 258xxx Virgin Media Limited 4+6
01423 259xxx Inclarity plc 4+6
01423 26xxxx Your Communications Ltd 4+6
01423 270xxx Coms.Com Ltd 4+6
01423 271xxx Resilient Networks Plc 4+6
01423 272xxx TelNG Limited 4+6
01423 273xxx Teledesign plc 4+6
01423 274xxx Localphone Limited 4+6
01423 275xxx T.T.N.C. Limited 4+6
01423 276xxx Frontier Systems Ltd 4+6
01423 277xxx Spitfire Network Services Ltd 4+6
01423 278xxx Orange Home UK Plc 4+6
01423 279xxx 24 Seven Communications Ltd 4+6
01423 28xxxx Cable & Wireless Plc 4+6
01423 290xxx VoIP-Un Limited 4+6
01423 291xxx O-Bit Telecom Limited 4+6
01423 292xxx Telecom2 Ltd 4+6
01423 30xxxx Cable and Wireless (Energis) 4+6
01423 310xxx Localphone Limited 4+6
01423 311xxx Starcomm Ltd 4+6
01423 312xxx TelNG Limited 4+6
01423 313xxx Opal Telecom Limited 4+6
01423 314xxx Frontier Systems Ltd 4+6
01423 315xxx Teledesign plc 4+6
01423 316xxx VoIP-Un Limited 4+6
01423 317xxx Net-Work Internet Ltd 4+6
01423 318xxx Timico Limited 4+6
01423 319xxx Nationwide Telephone Assistance Ltd 4+6
01423 32xxxx BT 4+6
01423 32xxxx MYBOR BT, Boroughbridge (North Yorkshire) 4+6
01423 33xxxx BT 4+6
01423 33xxxx MYGRE BT, Green Hammerton (North Yorkshire) 4+6
01423 34xxxx BT 4+6
01423 34xxxx MYCOP BT, Copgrove (North Yorkshire) 4+6
01423 356xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 357xxx MYTOC BT, Tockwith (North Yorkshire) 4+6
01423 35xxxx BT 4+6
01423 36xxxx BT 4+6
01423 36xxxx MYHLP BT, Helperby (North Yorkshire) 4+6
01423 37xxxx BT 4+6
01423 37xxxx MYBOR BT, Boroughbridge (North Yorkshire) 4+6
01423 38xxxx Your Communications Ltd 4+6
01423 390xxx Telswitch Limited 4+6
01423 391xxx Tiscali UK Limited 4+6
01423 392xxx 3C Limited 4+6
01423 393xxx Voxbone SA 4+6
01423 394xxx Known Future Limited 4+6
01423 395xxx Solutios Limited 4+6
01423 396xxx Gamma Telecom Holdings Ltd 4+6
01423 397xxx Skycom Ltd 4+6
01423 398xxx Easynet Group Ltd 4+6
01423 399xxx IPV6 Limited 4+6
01423 400xxx Switch Services Ltd 4+6
01423 401xxx Syntec UK Ltd 4+6
01423 402xxx Freshtel UK Limited 4+6
01423 403xxx Inclarity plc 4+6
01423 404xxx VTL (UK) Limited 4+6
01423 405xxx Coms.Com Ltd 4+6
01423 406xxx Net Solutions Europe Limited 4+6
01423 407xxx T.T.N.C. Limited 4+6
01423 408xxx Orange Home UK Plc 4+6
01423 409xxx Spitfire Network Services Ltd 4+6
01423 410xxx Instant Telecommunications Ltd 4+6
01423 411xxx Gamma Telecom Holdings Ltd 4+6
01423 412xxx Telecoms World Plc 4+6
01423 413xxx Danemere Street Creative 4+6
01423 414xxx Known Communications Limited 4+6
01423 50xxxx BT 4+6
01423 50xxxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 51xxxx InTechnology Plc 4+6 F-Digit '0,2,3,4,9'
01423 52xxxx BT 4+6
01423 52xxxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 53xxxx BT 4+6
01423 53xxxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 54xxxx Virgin Media Limited 4+6
01423 55xxxx Virgin Media Limited 4+6
01423 56xxxx BT 4+6
01423 56xxxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 58xxxx Affiniti Integrated Solutions Ltd 4+6
01423 59xxxx Magrathea Telecommunications Limited 4+6
01423 620xxx Mars Communications Limited 4+6
01423 621xxx Keycom plc 4+6
01423 622xxx Solutios Limited 4+6
01423 623xxx TeleWare PLC 4+6
01423 624xxx Primus Telecommunications 4+6
01423 625xxx Nexus Telecommunications plc 4+6
01423 626xxx Verizon UK Ltd 4+6
01423 628xxx CFL Communications Limited 4+6
01423 629xxx Mundio Mobile Limited 4+6
01423 70xxxx BT 4+6
01423 70xxxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 71xxxx BT 4+6
01423 71xxxx MYPBG BT, Pateley Bridge (North Yorkshire) 4+6
01423 72xxxx BT 4+6
01423 72xxxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 730xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 733xxx MYHUB BT, Huby (North Yorkshire) 4+6
01423 734xxx MYHUB BT, Huby (North Yorkshire) 4+6
01423 73xxxx BT 4+6
01423 74xxxx Telephony Services Limited 4+6
01423 75xxxx BT 4+6
01423 75xxxx MYRAM BT, Ramsgill Dale (North Yorkshire) 4+6
01423 76xxxx Danemere Street Creative 4+6
01423 77xxxx BT 4+6
01423 77xxxx MYBIR BT, Birstwith (North Yorkshire) 4+6
01423 78xxxx BT 4+6
01423 78xxxx MYDAR BT, Darley (North Yorkshire) 4+6
01423 790xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 792xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 793xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 795xxx MYKNA BT, Knaresborough (North Yorkshire) 4+6
01423 798xxx MYKNA BT, Knaresborough (North Yorkshire) 4+6
01423 799xxx MYKNA BT, Knaresborough (North Yorkshire) 4+6
01423 79xxxx BT 4+6
01423 810xxx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 812xxx MYSRB BT, Starbeck (North Yorkshire) 4+6
01423 813xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 814xxx MYSRB BT, Starbeck (North Yorkshire) 4+6
01423 815xxx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 817xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 818xxx MYSRB BT, Starbeck (North Yorkshire) 4+6
01423 81xxxx BT 4+6
01423 82xxxx Thus Plc 4+6
01423 830xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 832xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 833xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8340xx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8341xx MYPBG BT, Pateley Bridge (North Yorkshire) 4+6
01423 8342xx MYKNA BT, Knaresborough (North Yorkshire) 4+6
01423 8343xx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8344xx MYKNA BT, Knaresborough (North Yorkshire) 4+6
01423 8345xx MYBOR BT, Boroughbridge (North Yorkshire) 4+6
01423 8346xx MYPBG BT, Pateley Bridge (North Yorkshire) 4+6
01423 836xxx MYSRB BT, Starbeck (North Yorkshire) 4+6
01423 8383xx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8384xx MYSRB BT, Starbeck (North Yorkshire) 4+6
01423 8387xx MYKNA BT, Knaresborough (North Yorkshire) 4+6
01423 8388xx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 83xxxx BT 4+6
01423 84xxxx Cable & Wireless UK 4+6
01423 850xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 851xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 852xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8530xx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8531xx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 8532xx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 8533xx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 8539xx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 854xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8550xx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 8557xx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 8558xx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8559xx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 856xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 857xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 858xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 859xxx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 85xxxx BT 4+6
01423 86xxxx BT 4+6
01423 86xxxx MYKNA BT, Knaresborough (North Yorkshire) 4+6
01423 870xxx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 875xxx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 8760xx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 8769xx MYHGT BT, Harrogate (Yorkshire - North) 4+6
01423 878xxx MYOAT BT, Oatlands Mount (North Yorkshire) 4+6
01423 87xxxx BT 4+6
01423 88xxxx BT 4+6
01423 88xxxx MYSRB BT, Starbeck (North Yorkshire) 4+6
01423 89xxxx Cable & Wireless UK 4+6
01423 90xxxx Magrathea Telecommunications Limited 4+6