United Kingdom

Number Code Allocated To Number Length Notes
01923 20xxxx BT 4+6
01923 20xxxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 21xxxx BT 4+6
01923 22xxxx BT 4+6
01923 23xxxx BT 4+6
01923 24xxxx BT 4+6
01923 25xxxx BT 4+6
01923 26xxxx BT 4+6
01923 26xxxx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 272xxx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 273xxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 274xxx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 275xxx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 276xxx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 277xxx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 278xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 279xxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 27xxxx BT 4+6
01923 280xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 282xxx LWCHO BT, Chorleywood (Hertfordshire) 4+6
01923 287xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 289xxx LWRAD BT, Radlett (Hertfordshire) 4+6
01923 28xxxx BT 4+6
01923 290xxx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 293xxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 294xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 299xxx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 29xxxx BT 4+6
01923 30xxxx Starcomm Ltd 4+6
01923 31xxxx Thus Plc 4+6
01923 32xxxx Virgin Media Limited 4+6
01923 33xxxx Virgin Media Limited 4+6
01923 34xxxx Virgin Media Limited 4+6
01923 35xxxx Virgin Media Limited 4+6
01923 36xxxx Cable & Wireless UK 4+6
01923 370xxx TG Support Limited 4+6
01923 371xxx Easynet Group Ltd 4+6
01923 372xxx Orange Home UK Plc 4+6
01923 373xxx Net Solutions Europe Limited 4+6
01923 374xxx TelNG Limited 4+6
01923 375xxx T.T.N.C. Limited 4+6
01923 376xxx Global One Communications Holding Ltd 4+6
01923 377xxx Virgin Media Limited 4+6
01923 378xxx COLT Telecommunications 4+6
01923 379xxx C3 Europe Limited 4+6
01923 380xxx VoIP-Un Limited 4+6
01923 381xxx Voxbone SA 4+6
01923 382xxx O-Bit Telecom Limited 4+6
01923 383xxx TelXL Ltd 4+6
01923 384xxx Telecom2 Ltd 4+6
01923 385xxx Timico Limited 4+6
01923 386xxx Invest UK Limited 4+6
01923 387xxx Telswitch Limited 4+6
01923 388xxx Tiscali UK Limited 4+6
01923 389xxx Lumison Limited 4+6
01923 39xxxx Cable and Wireless (Energis) 4+6
01923 40xxxx Virgin Media Limited 4+6
01923 41xxxx Cable & Wireless UK 4+6
01923 42xxxx Cable & Wireless UK 4+6
01923 43xxxx Cable & Wireless UK 4+6
01923 44xxxx Virgin Media Limited 4+6
01923 45xxxx Telewest Communications Group Limited 4+6
01923 46xxxx Virgin Media Limited 4+6
01923 47xxxx BT 4+6
01923 47xxxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4804xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 4806xx LWNWOO BT, Northwood (London - Greater) 4+6
01923 4807xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 4808xx LWNWOO BT, Northwood (London - Greater) 4+6
01923 4809xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4810xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 4811xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4812xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 4813xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4815xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4816xx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 4817xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4819xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4821xx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 4822xx LWHAT BT, Hatch End (London - Greater) 4+6
01923 4823xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 4824xx LWCHO BT, Chorleywood (Hertfordshire) 4+6
01923 4825xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4826xx LWNWOO BT, Northwood (London - Greater) 4+6
01923 4827xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4828xx LWKLAN BT, Kings Langley (Hertfordshire) 4+6
01923 4830xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4832xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 4840xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4841xx LWNWOO BT, Northwood (London - Greater) 4+6
01923 4842xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 4848xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 4851xx LWNWOO BT, Northwood (London - Greater) 4+6
01923 4852xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4853xx LWNWOO BT, Northwood (London - Greater) 4+6
01923 4854xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4860xx LWRAD BT, Radlett (Hertfordshire) 4+6
01923 4861xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 4867xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 48xxxx BT 4+6
01923 49xxxx Virgin Media Limited 4+6
01923 50xxxx TELSTRA EUROPE LIMITED 4+6 F-Digit '4'
01923 51xxxx Opal Telecom Limited 4+6 F-Digit '0,8'
01923 520xxx Danemere Street Creative 4+6
01923 521xxx Freshtel UK Limited 4+6
01923 522xxx Known Future Limited 4+6
01923 523xxx Switch Services Ltd 4+6
01923 524xxx InTechnology Plc 4+6
01923 525xxx Your Communications Ltd 4+6
01923 526xxx Zimo Communications Limited 4+6
01923 527xxx FleXtel Limited 4+6
01923 528xxx Localphone Limited 4+6
01923 529xxx PlusNet PLC 4+6
01923 530xxx 3C Limited 4+6
01923 531xxx Skymarket Limited 4+6
01923 532xxx Skycom Ltd 4+6
01923 533xxx Solutios Limited 4+6
01923 534xxx IPV6 Limited 4+6
01923 535xxx Mars Communications Limited 4+6
01923 536xxx Instant Telecommunications Ltd 4+6
01923 537xxx INET Telecoms Ltd (Voipfone) 4+6
01923 538xxx Qeito Network Solutions Ltd 4+6
01923 539xxx Keycom plc 4+6
01923 540xxx Telecoms World Plc 4+6
01923 541xxx CFL Communications Limited 4+6
01923 542xxx Mundio Mobile Limited 4+6
01923 543xxx Known Communications Limited 4+6
01923 544xxx Nexus Telecommunications plc 4+6
01923 545xxx GlobalVocal Limited 4+6
01923 546xxx Invomo Ltd 4+6
01923 547xxx i-Net Communications Group Plc 4+6
01923 548xxx TeleWare PLC 4+6
01923 60xxxx Gamma Telecom Holdings Ltd 4+6
01923 61xxxx BT 4+6
01923 620xxx Global Crossing (UK) Ltd 4+6
01923 621xxx Callagenix Ltd 4+6
01923 622xxx Global Crossing (UK) Ltd 4+6
01923 623xxx Global Crossing (UK) Ltd 4+6
01923 624xxx Simwood eSMS Limited 4+6
01923 625xxx Coralbridge Ltd 4+6
01923 626xxx Teledesign plc 4+6
01923 627xxx Spitfire Network Services Ltd 4+6
01923 628xxx Power Internet Limited 4+6
01923 629xxx Resilient Networks Plc 4+6
01923 63xxxx BT 4+6
01923 63xxxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 64xxxx Edge Telecom Ltd 4+6
01923 65xxxx BT 4+6
01923 65xxxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 66xxxx BT 4+6
01923 66xxxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 67xxxx BT 4+6
01923 67xxxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 683xxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 684xxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 686xxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 687xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 688xxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 689xxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 68xxxx BT 4+6
01923 690xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 692xxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 693xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 695xxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 6960xx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 6965xx LWWAT BT, Watford (Hertfordshire) 4+6
01923 697xxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 698xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 69xxxx BT 4+6
01923 70xxxx Affiniti Integrated Solutions Ltd 4+6
01923 71xxxx BT 4+6
01923 71xxxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 72xxxx BT 4+6
01923 72xxxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 73xxxx Inclarity plc 4+6
01923 74xxxx Verizon UK Ltd 4+6 F-Digit '0,1,2'
01923 75xxxx Telephony Services Limited 4+6
01923 76xxxx Syntec UK Ltd 4+6 F-Digit '0, 1, 2'
01923 77xxxx BT 4+6
01923 77xxxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 78xxxx Cable & Wireless Plc 4+6
01923 79xxxx VTL (UK) Limited 4+6 F-Digit '7'
01923 800xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 808xxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 809xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 80xxxx BT 4+6
01923 81xxxx BT 4+6
01923 81xxxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 82xxxx BT 4+6
01923 82xxxx LWNWOO BT, Northwood (London - Greater) 4+6
01923 830xxx LWWAT BT, Watford (Hertfordshire) 4+6
01923 832xxx LWNWOO BT, Northwood (London - Greater) 4+6
01923 834xxx LWNWOO BT, Northwood (London - Greater) 4+6
01923 835xxx LWNWOO BT, Northwood (London - Greater) 4+6
01923 839xxx LWRAD BT, Radlett (Hertfordshire) 4+6
01923 83xxxx BT 4+6
01923 84xxxx BT 4+6
01923 84xxxx LWNWOO BT, Northwood (London - Greater) 4+6
01923 85xxxx BT 4+6
01923 85xxxx LWRAD BT, Radlett (Hertfordshire) 4+6
01923 86xxxx LogicStar Limited 4+6 F-Digit '0'
01923 87xxxx Connect Telecom UK Ltd 4+6 F-Digit '9'
01923 88xxxx Magrathea Telecommunications Limited 4+6
01923 890xxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 891xxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 892xxx LWGAR BT, Garston (Hertfordshire) 4+6
01923 895xxx LWRIC BT, Rickmansworth (Hertfordshire) 4+6
01923 89xxxx BT 4+6
01923 900xxx Net-Work Internet Ltd 4+6
01923 901xxx Frontier Systems Ltd 4+6
01923 902xxx Nationwide Telephone Assistance Ltd 4+6
01923 955xxx BT 4+6
01923 956xxx BT 4+6
01923 957xxx BT 4+6
01923 958xxx BT 4+6