This page contains information about which telephone companies the various 01243 numbers are allocated to.
| First Digits | Status | Communications Provider | Number Length | Notes | Change |
|---|---|---|---|---|---|
| 01243 00 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 01 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 02 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 03 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 04 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 05 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 06 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 07 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 08 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 09 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 10 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 11 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 12 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 13 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 14 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 15 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 16 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 17 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 18 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 19 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01243 20 | Allocated | Telephony Services Limited | 4+6 | - | 01/11/2004 |
| 01243 21 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | F-Digits '0,1,2,3,4,5,6,7,8,9' | 05/04/2004 |
| 01243 22 | Allocated | BT | 4+6 | - | 03/08/1994 |
| 01243 23 | Allocated | Danemere Street Creative | 4+6 | - | 27/10/2004 |
| 01243 24 | Allocated | Vodafone Ltd (Thus) | 4+6 | - | 08/06/2004 |
| 01243 250 | Allocated | Linear Telecoms Limited | 4+6 | - | 05/10/2010 |
| 01243 251 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 22/09/2011 |
| 01243 252 | Allocated | Invoco Ltd | 4+6 | - | 21/09/2011 |
| 01243 253 | Allocated | Barritec Limited | 4+6 | - | 20/09/2011 |
| 01243 254 | Allocated | Internexus Networks Limited | 4+6 | - | 18/11/2011 |
| 01243 255 | Allocated | Tuxtel Ltd | 4+6 | - | 21/12/2011 |
| 01243 256 | Allocated | Simwood eSMS Limited | 4+6 | - | 01/02/2012 |
| 01243 257 | Allocated | Bicom Systems EURL | 4+6 | - | 02/03/2012 |
| 01243 258 | Allocated | Broadcast Telecom Ltd | 4+6 | - | 09/02/2012 |
| 01243 259 | Allocated | API Telecom Limited | 4+6 | - | 26/03/2012 |
| 01243 26 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 270 | Allocated | Inclarity Communications Ltd | 4+6 | - | 03/12/2010 |
| 01243 271 | Allocated | Inclarity Communications Ltd | 4+6 | - | 03/12/2010 |
| 01243 272 | Allocated | Inclarity Communications Ltd | 4+6 | - | 03/12/2010 |
| 01243 273 | Allocated | IOVOX Limited | 4+6 | - | 03/04/2012 |
| 01243 274 | Allocated | Ziron (UK) Ltd | 4+6 | - | 27/07/2012 |
| 01243 275 | Allocated | Inclarity Communications Ltd | 4+6 | - | 03/12/2010 |
| 01243 276 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 03/08/2012 |
| 01243 277 | Allocated | We Love Communications Limited | 4+6 | - | 07/08/2012 |
| 01243 278 | Allocated | TalkTalk Communications Limited | 4+6 | - | 06/09/2012 |
| 01243 279 | Allocated | ICC Networks Ltd | 4+6 | - | 12/04/2012 |
| 01243 280 | Allocated | Six Degrees Unified Comms Limited | 4+6 | - | 18/07/2005 |
| 01243 281 | Protected | - | 4+6 | - | - |
| 01243 282 | Allocated | Six Degrees Unified Comms Limited | 4+6 | - | 18/07/2005 |
| 01243 283 | Protected | - | 4+6 | - | - |
| 01243 284 | Allocated | Six Degrees Unified Comms Limited | 4+6 | - | 18/07/2005 |
| 01243 285 | Protected | - | 4+6 | - | - |
| 01243 286 | Protected | - | 4+6 | - | - |
| 01243 287 | Protected | - | 4+6 | - | - |
| 01243 288 | Protected | - | 4+6 | - | - |
| 01243 289 | Protected | - | 4+6 | - | - |
| 01243 29 | Allocated | FleXtel Limited | 4+6 | - | 19/10/2005 |
| 01243 300 | Allocated | IP Base Ltd | 4+6 | - | 21/01/2011 |
| 01243 301 | Protected | - | 4+6 | - | - |
| 01243 302 | Protected | - | 4+6 | - | - |
| 01243 303 | Protected | - | 4+6 | - | - |
| 01243 304 | Protected | - | 4+6 | - | - |
| 01243 305 | Protected | - | 4+6 | - | - |
| 01243 306 | Protected | - | 4+6 | - | - |
| 01243 307 | Protected | - | 4+6 | - | - |
| 01243 308 | Protected | - | 4+6 | - | - |
| 01243 309 | Protected | - | 4+6 | - | - |
| 01243 310 | Protected | - | 4+6 | - | - |
| 01243 311 | Protected | - | 4+6 | - | - |
| 01243 312 | Protected | - | 4+6 | - | - |
| 01243 313 | Protected | - | 4+6 | - | - |
| 01243 314 | Protected | - | 4+6 | - | - |
| 01243 315 | Protected | - | 4+6 | - | - |
| 01243 316 | Protected | - | 4+6 | - | - |
| 01243 317 | Protected | - | 4+6 | - | - |
| 01243 318 | Protected | - | 4+6 | - | - |
| 01243 319 | Protected | - | 4+6 | - | - |
| 01243 320 | Protected | - | 4+6 | - | - |
| 01243 321 | Protected | - | 4+6 | - | - |
| 01243 322 | Protected | - | 4+6 | - | - |
| 01243 323 | Allocated | Coms.Com Ltd | 4+6 | - | 08/06/2011 |
| 01243 324 | Allocated | Coms.Com Ltd | 4+6 | - | 08/06/2011 |
| 01243 325 | Protected | - | 4+6 | - | - |
| 01243 326 | Protected | - | 4+6 | - | - |
| 01243 327 | Protected | - | 4+6 | - | - |
| 01243 328 | Protected | - | 4+6 | - | - |
| 01243 329 | Protected | - | 4+6 | - | - |
| 01243 33 | Allocated | Edge Telecom Limited | 4+6 | - | 15/03/2005 |
| 01243 340 | Allocated | Digitech Solutions Global Limited | 4+6 | - | 06/09/2010 |
| 01243 341 | Protected | - | 4+6 | - | - |
| 01243 342 | Protected | - | 4+6 | - | - |
| 01243 343 | Protected | - | 4+6 | - | - |
| 01243 344 | Protected | - | 4+6 | - | - |
| 01243 345 | Protected | - | 4+6 | - | - |
| 01243 346 | Protected | - | 4+6 | - | - |
| 01243 347 | Protected | - | 4+6 | - | - |
| 01243 348 | Protected | - | 4+6 | - | - |
| 01243 349 | Protected | - | 4+6 | - | - |
| 01243 35 | Allocated | Danemere Street Creative | 4+6 | F-Digit '2' | 03/07/2006 |
| 01243 36 | Allocated | Net Solutions Europe Limited | 4+6 | - | 01/12/2005 |
| 01243 37 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 38 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 39 | Allocated | TG Support Limited | 4+6 | - | 05/07/2006 |
| 01243 400 | Protected | - | 4+6 | - | - |
| 01243 401 | Protected | - | 4+6 | - | - |
| 01243 402 | Protected | - | 4+6 | - | - |
| 01243 403 | Protected | - | 4+6 | - | - |
| 01243 404 | Protected | - | 4+6 | - | - |
| 01243 405 | Protected | - | 4+6 | - | - |
| 01243 406 | Protected | - | 4+6 | - | - |
| 01243 407 | Protected | - | 4+6 | - | - |
| 01243 408 | Protected | - | 4+6 | - | - |
| 01243 409 | Protected | - | 4+6 | - | - |
| 01243 410 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 18/02/2010 |
| 01243 411 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 18/02/2010 |
| 01243 412 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 18/02/2010 |
| 01243 413 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 18/02/2010 |
| 01243 414 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 18/02/2010 |
| 01243 415 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 18/02/2010 |
| 01243 416 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 18/02/2010 |
| 01243 417 | Protected | - | 4+6 | - | - |
| 01243 418 | Protected | - | 4+6 | - | - |
| 01243 419 | Protected | - | 4+6 | - | - |
| 01243 42 | Allocated | IV Response Limited | 4+6 | - | 04/07/2005 |
| 01243 43 | Allocated | Virgin Media Limited | 4+6 | - | 24/01/1995 |
| 01243 440 | Protected | - | 4+6 | - | - |
| 01243 441 | Allocated | Virgin Media Limited | 4+6 | - | 24/03/1997 |
| 01243 442 | Allocated | Virgin Media Limited | 4+6 | - | 24/03/1997 |
| 01243 443 | Protected | - | 4+6 | - | - |
| 01243 444 | Protected | - | 4+6 | - | - |
| 01243 445 | Protected | - | 4+6 | - | - |
| 01243 446 | Protected | - | 4+6 | - | - |
| 01243 447 | Protected | - | 4+6 | - | - |
| 01243 448 | Protected | - | 4+6 | - | - |
| 01243 449 | Protected | - | 4+6 | - | - |
| 01243 450 | Protected | - | 4+6 | - | - |
| 01243 451 | Protected | - | 4+6 | - | - |
| 01243 452 | Protected | - | 4+6 | - | - |
| 01243 453 | Protected | - | 4+6 | - | - |
| 01243 454 | Protected | - | 4+6 | - | - |
| 01243 455 | Protected | - | 4+6 | - | - |
| 01243 456 | Protected | - | 4+6 | - | - |
| 01243 457 | Protected | - | 4+6 | - | - |
| 01243 458 | Protected | - | 4+6 | - | - |
| 01243 459 | Allocated | Virgin Media Limited | 4+6 | - | 27/06/2012 |
| 01243 460 | Protected | - | 4+6 | - | - |
| 01243 461 | Protected | - | 4+6 | - | - |
| 01243 462 | Protected | - | 4+6 | - | - |
| 01243 463 | Protected | - | 4+6 | - | - |
| 01243 464 | Protected | - | 4+6 | - | - |
| 01243 465 | Protected | - | 4+6 | - | - |
| 01243 466 | Protected | - | 4+6 | - | - |
| 01243 467 | Protected | - | 4+6 | - | - |
| 01243 468 | Protected | - | 4+6 | - | - |
| 01243 469 | Protected | - | 4+6 | - | - |
| 01243 47 | Allocated | Teledesign Ltd | 4+6 | F-Digit '2' | 26/09/2006 |
| 01243 480 | Protected | - | 4+6 | - | - |
| 01243 481 | Protected | - | 4+6 | - | - |
| 01243 482 | Protected | - | 4+6 | - | - |
| 01243 483 | Protected | - | 4+6 | - | - |
| 01243 484 | Protected | - | 4+6 | - | - |
| 01243 485 | Protected | - | 4+6 | - | - |
| 01243 486 | Protected | - | 4+6 | - | - |
| 01243 487 | Allocated | Spitfire Network Services Ltd | 4+6 | - | 21/07/2011 |
| 01243 488 | Protected | - | 4+6 | - | - |
| 01243 489 | Protected | - | 4+6 | - | - |
| 01243 49 | Allocated | Easynet Enterprise Services Limited | 4+6 | F-Digit '5' | 16/01/2007 |
| 01243 50 | Allocated | Barritel Limited | 4+6 | F-Digit '2' | 09/03/2006 |
| 01243 51 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 52 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 53 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 54 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 55 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 56 | Allocated | TelNG Limited | 4+6 | F-Digit '2' | 26/02/2007 |
| 01243 57 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 58 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 59 | Allocated | Localphone Limited | 4+6 | F-Digit '0' | 24/04/2007 |
| 01243 60 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 61 | Allocated | Verizon UK Ltd | 4+6 | F-Digit '0' | 03/04/2007 |
| 01243 62 | Allocated | Vodafone Ltd (C&W) | 4+6 | F-Digits '0,1,2,3,4,5,6,7,8,9' | 04/02/2010 |
| 01243 63 | Allocated | TTNC Limited | 4+6 | F-Digit 0,1,2,3,4,5,6,7,8,9 | 31/01/2006 |
| 01243 64 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 65 | Allocated | Alphatalk Ltd | 4+6 | - | 15/12/2006 |
| 01243 660 | Protected | - | 4+6 | - | - |
| 01243 661 | Protected | - | 4+6 | - | - |
| 01243 662 | Protected | - | 4+6 | - | - |
| 01243 663 | Protected | - | 4+6 | - | - |
| 01243 664 | Protected | - | 4+6 | - | - |
| 01243 665 | Protected | - | 4+6 | - | - |
| 01243 666 | Allocated | Served Up Limited. | 4+6 | - | 09/05/2008 |
| 01243 667 | Allocated | Served Up Limited. | 4+6 | - | 09/05/2008 |
| 01243 668 | Protected | - | 4+6 | - | - |
| 01243 669 | Protected | - | 4+6 | - | - |
| 01243 67 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 680 | Allocated | Frontier Systems Ltd | 4+6 | - | 04/09/2007 |
| 01243 681 | Allocated | TalkTalk Communications Limited | 4+6 | - | 15/10/2007 |
| 01243 682 | Allocated | VoIP-Un Limited | 4+6 | - | 26/10/2007 |
| 01243 683 | Allocated | Premium O Limited | 4+6 | - | 28/12/2007 |
| 01243 684 | Allocated | Voxbone SA | 4+6 | - | 10/12/2007 |
| 01243 685 | Allocated | Digital Mail Limited | 4+6 | - | 29/04/2008 |
| 01243 686 | Allocated | Timico Limited | 4+6 | - | 29/11/2007 |
| 01243 687 | Allocated | IPV6 Limited | 4+6 | - | 27/01/2009 |
| 01243 688 | Allocated | Starcomm Ltd | 4+6 | - | 22/05/2007 |
| 01243 689 | Allocated | (aq) Limited trading as aql | 4+6 | - | 02/10/2007 |
| 01243 690 | Protected | - | 4+6 | - | - |
| 01243 691 | Protected | - | 4+6 | - | - |
| 01243 692 | Protected | - | 4+6 | - | - |
| 01243 693 | Protected | - | 4+6 | - | - |
| 01243 694 | Protected | - | 4+6 | - | - |
| 01243 695 | Protected | - | 4+6 | - | - |
| 01243 696 | Allocated | TalkTalk Communications Limited | 4+6 | - | 31/08/2011 |
| 01243 697 | Allocated | TalkTalk Communications Limited | 4+6 | - | 31/08/2011 |
| 01243 698 | Allocated | TalkTalk Communications Limited | 4+6 | - | 31/08/2011 |
| 01243 699 | Allocated | TalkTalk Communications Limited | 4+6 | - | 31/08/2011 |
| 01243 70 | Allocated | InTechnology Plc | 4+6 | - | 07/06/2007 |
| 01243 710 | Allocated | Nodemax Limited | 4+6 | - | 15/07/2008 |
| 01243 711 | Allocated | 3C Limited | 4+6 | - | 10/09/2008 |
| 01243 712 | Allocated | Mars Communications Limited | 4+6 | - | 04/02/2009 |
| 01243 713 | Allocated | Callagenix Ltd | 4+6 | - | 24/07/2008 |
| 01243 714 | Allocated | Solutios Limited | 4+6 | - | 27/08/2008 |
| 01243 715 | Allocated | Andrews & Arnold (Numbers) Ltd | 4+6 | - | 26/02/2009 |
| 01243 716 | Allocated | Telecom2 Ltd | 4+6 | - | 11/09/2009 |
| 01243 717 | Allocated | Affiniti Integrated Solutions Ltd | 4+6 | - | 12/11/2007 |
| 01243 718 | Protected | - | 4+6 | - | - |
| 01243 719 | Allocated | X-Pilot Limited | 4+6 | F-Digit '0' | 16/06/2009 |
| 01243 720 | Allocated | Level 3 Communications UK Limited | 4+6 | - | 25/07/2011 |
| 01243 721 | Protected | - | 4+6 | - | - |
| 01243 722 | Protected | - | 4+6 | - | - |
| 01243 723 | Allocated | Level 3 Communications UK Limited | 4+6 | - | 25/07/2011 |
| 01243 724 | Protected | - | 4+6 | - | - |
| 01243 725 | Protected | - | 4+6 | - | - |
| 01243 726 | Protected | - | 4+6 | - | - |
| 01243 727 | Protected | - | 4+6 | - | - |
| 01243 728 | Protected | - | 4+6 | - | - |
| 01243 729 | Allocated | Level 3 Communications UK Limited | 4+6 | - | 25/07/2011 |
| 01243 73 | Allocated | Syntec Limited | 4+6 | - | 21/12/2004 |
| 01243 740 | Protected | - | 4+6 | - | - |
| 01243 741 | Protected | - | 4+6 | - | - |
| 01243 742 | Protected | - | 4+6 | - | - |
| 01243 743 | Protected | - | 4+6 | - | - |
| 01243 744 | Protected | - | 4+6 | - | - |
| 01243 745 | Protected | - | 4+6 | - | - |
| 01243 746 | Protected | - | 4+6 | - | - |
| 01243 747 | Protected | - | 4+6 | - | - |
| 01243 748 | Protected | - | 4+6 | - | - |
| 01243 749 | Protected | - | 4+6 | - | - |
| 01243 75 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 760 | Allocated | Telecoms World Plc | 4+6 | - | 09/03/2009 |
| 01243 761 | Allocated | TeleWare PLC | 4+6 | - | 12/12/2012 |
| 01243 762 | Allocated | Colloquium Ltd | 4+6 | - | 26/03/2009 |
| 01243 763 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 31/12/2008 |
| 01243 764 | Allocated | Mundio Mobile Limited | 4+6 | - | 29/06/2009 |
| 01243 765 | Allocated | Andrews & Arnold Ltd | 4+6 | - | 20/08/2007 |
| 01243 766 | Allocated | Net-Work Internet Ltd | 4+6 | - | 28/01/2008 |
| 01243 767 | Allocated | iNet Telecoms Ltd (Voipfone) | 4+6 | - | 27/02/2009 |
| 01243 768 | Allocated | CFL Communications Limited | 4+6 | - | 07/07/2009 |
| 01243 769 | Allocated | Nationwide Telephone Assistance Ltd | 4+6 | - | 01/10/2007 |
| 01243 77 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 78 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 79 | Allocated | BT | 4+6 | - | 30/04/1996 |
| 01243 80 | Allocated | Citrus Telecommunications Ltd | 4+6 | - | 08/03/2006 |
| 01243 81 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 82 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 83 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 84 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 85 | Allocated | BT | 4+6 | - | 21/03/1995 |
| 01243 86 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01243 87 | Allocated | BT | 4+6 | - | 16/02/1999 |
| 01243 880 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 16/11/2011 |
| 01243 881 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 16/11/2011 |
| 01243 882 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 16/11/2011 |
| 01243 883 | Protected | - | 4+6 | - | - |
| 01243 884 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 16/11/2011 |
| 01243 885 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 16/11/2011 |
| 01243 886 | Protected | - | 4+6 | - | - |
| 01243 887 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 16/11/2011 |
| 01243 888 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 16/11/2011 |
| 01243 889 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 17/11/2011 |
| 01243 890 | Allocated | Resilient Networks Plc | 4+6 | - | 09/09/2011 |
| 01243 891 | Protected | - | 4+6 | - | - |
| 01243 892 | Protected | - | 4+6 | - | - |
| 01243 893 | Protected | - | 4+6 | - | - |
| 01243 894 | Protected | - | 4+6 | - | - |
| 01243 895 | Protected | - | 4+6 | - | - |
| 01243 896 | Protected | - | 4+6 | - | - |
| 01243 897 | Protected | - | 4+6 | - | - |
| 01243 898 | Protected | - | 4+6 | - | - |
| 01243 899 | Allocated | Resilient Networks Plc | 4+6 | - | 09/09/2011 |
| 01243 900 | Allocated | Known Communications Limited | 4+6 | - | 15/09/2009 |
| 01243 901 | Allocated | Nexus Telecommunications Limited | 4+6 | - | 25/09/2009 |
| 01243 902 | Allocated | Wightfibre Limited | 4+6 | - | 09/11/2009 |
| 01243 903 | Allocated | Invomo Ltd | 4+6 | - | 04/12/2009 |
| 01243 904 | Allocated | i-Net Communications Group Plc | 4+6 | - | 15/01/2010 |
| 01243 905 | Allocated | PTGI International Carrier Services Ltd | 4+6 | - | 29/01/2010 |
| 01243 906 | Allocated | Orbis Telecom | 4+6 | - | 29/01/2010 |
| 01243 907 | Allocated | Atomstream Limited | 4+6 | - | 25/02/2010 |
| 01243 908 | Allocated | Buzz Networks Limited | 4+6 | - | 01/03/2010 |
| 01243 909 | Allocated | E164 Ltd | 4+6 | - | 22/03/2010 |
| 01243 910 | Allocated | Digitech Solutions Global Limited | 4+6 | - | 23/04/2010 |
| 01243 911 | Allocated | Suretec Systems Ltd | 4+6 | - | 29/04/2010 |
| 01243 912 | Allocated | Calltracks Limited | 4+6 | - | 07/07/2010 |
| 01243 913 | Allocated | Windsor Telecom Plc | 4+6 | - | 19/07/2010 |
| 01243 914 | Allocated | Core Telecom Limited | 4+6 | - | 05/08/2010 |
| 01243 915 | Allocated | VoiceHost Limited | 4+6 | - | 26/08/2010 |
| 01243 916 | Allocated | Numbergroup Network Ltd | 4+6 | - | 03/12/2010 |
| 01243 917 | Allocated | Cheers International Sales Limited | 4+6 | - | 14/12/2010 |
| 01243 918 | Allocated | Globecom International Limited | 4+6 | - | 29/12/2010 |
| 01243 919 | Allocated | Invosys Limited | 4+6 | - | 17/01/2011 |
| 01243 920 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 11/02/2011 |
| 01243 921 | Allocated | Hello Telecom (UK) PLC | 4+6 | - | 14/04/2011 |
| 01243 922 | Allocated | Tesla Dynamic Ltd | 4+6 | - | 07/07/2011 |
| 01243 923 | Allocated | Nexbridge Communications Limited | 4+6 | - | 14/03/2011 |
| 01243 924 | Allocated | Orbtalk Limited | 4+6 | - | 11/07/2011 |
| 01243 925 | Allocated | Minotaur Telecom Limited | 4+6 | - | 11/03/2011 |
| 01243 926 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 12/12/2012 |
| 01243 927 | Allocated | Media Hawk Ltd | 4+6 | - | 10/04/2013 |
| 01243 928 | Allocated | Affiniti Integrated Solutions Ltd | 4+6 | - | 19/11/2013 |
| 01243 929 | Allocated | iHub UK Ltd | 4+6 | - | 14/08/2013 |
| 01243 930 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 20/06/2013 |
| 01243 931 | Allocated | TalkTalk Communications Limited | 4+6 | - | 29/11/2013 |
| 01243 932 | Allocated | Orange Business Holdings UK Limited | 4+6 | - | 16/01/2013 |
| 01243 933 | Allocated | Kalnet4u Ltd | 4+6 | - | 08/05/2013 |
| 01243 934 | Allocated | Content Guru Ltd | 4+6 | - | 29/08/2013 |
| 01243 935 | Allocated | Radius Communications Limited | 4+6 | - | 07/01/2014 |
| 01243 936 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 13/01/2014 |
| 01243 937 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 13/01/2014 |
| 01243 938 | Allocated | XoverX Ltd | 4+6 | - | 01/05/2013 |
| 01243 939 | Allocated | COLT Technology Services | 4+6 | - | 30/01/2013 |
| 01243 940 | Allocated | BT | 4+6 | - | 05/02/2014 |
| 01243 941 | Allocated | TalkTalk Communications Limited | 4+6 | - | 09/09/2014 |
| 01243 942 | Free | - | 4+6 | - | - |
| 01243 943 | Free | - | 4+6 | - | - |
| 01243 944 | Free | - | 4+6 | - | - |
| 01243 945 | Free | - | 4+6 | - | - |
| 01243 946 | Free | - | 4+6 | - | - |
| 01243 947 | Free | - | 4+6 | - | - |
| 01243 948 | Free | - | 4+6 | - | - |
| 01243 949 | Free | - | 4+6 | - | - |
| 01243 950 | Protected | - | 4+6 | - | - |
| 01243 951 | Protected | - | 4+6 | - | - |
| 01243 952 | Protected | - | 4+6 | - | - |
| 01243 953 | Protected | - | 4+6 | - | - |
| 01243 954 | Protected | - | 4+6 | - | - |
| 01243 955 | Protected | - | 4+6 | - | - |
| 01243 956 | Protected | - | 4+6 | - | - |
| 01243 957 | Protected | - | 4+6 | - | - |
| 01243 958 | Protected | - | 4+6 | - | - |
| 01243 959 | Protected | - | 4+6 | - | - |
| 01243 960 | Protected | - | 4+6 | - | - |
| 01243 961 | Protected | - | 4+6 | - | - |
| 01243 962 | Protected | - | 4+6 | - | - |
| 01243 963 | Protected | - | 4+6 | - | - |
| 01243 964 | Protected | - | 4+6 | - | - |
| 01243 965 | Protected | - | 4+6 | - | - |
| 01243 966 | Protected | - | 4+6 | - | - |
| 01243 967 | Protected | - | 4+6 | - | - |
| 01243 968 | Protected | - | 4+6 | - | - |
| 01243 969 | Protected | - | 4+6 | - | - |
| 01243 970 | Protected | - | 4+6 | - | - |
| 01243 971 | Protected | - | 4+6 | - | - |
| 01243 972 | Protected | - | 4+6 | - | - |
| 01243 973 | Protected | - | 4+6 | - | - |
| 01243 974 | Protected | - | 4+6 | - | - |
| 01243 975 | Protected | - | 4+6 | - | - |
| 01243 976 | Protected | - | 4+6 | - | - |
| 01243 977 | Protected | - | 4+6 | - | - |
| 01243 978 | Protected | - | 4+6 | - | - |
| 01243 979 | Protected | - | 4+6 | - | - |
| 01243 980 | Protected | - | 4+6 | - | - |
| 01243 981 | Protected | - | 4+6 | - | - |
| 01243 982 | Protected | - | 4+6 | - | - |
| 01243 983 | Protected | - | 4+6 | - | - |
| 01243 984 | Protected | - | 4+6 | - | - |
| 01243 985 | Protected | - | 4+6 | - | - |
| 01243 986 | Protected | - | 4+6 | - | - |
| 01243 987 | Protected | - | 4+6 | - | - |
| 01243 988 | Protected | - | 4+6 | - | - |
| 01243 989 | Protected | - | 4+6 | - | - |
| 01243 99 | Protected | - | N/A | - | - |