01543 10 | BT | 13/11/2002 |
01543 20 | Redcentric Solutions Limited | 05/06/2015 |
01543 210 | DIDWW Ireland Limited | 18/01/2019 |
01543 211 | BT | 17/12/2018 |
01543 212 | BT | 25/10/2019 |
01543 215 | Daisy Communications Ltd | 13/12/2011 |
01543 216 | Daisy Communications Ltd | 13/12/2011 |
01543 217 | Daisy Communications Ltd | 13/12/2011 |
01543 218 | Daisy Communications Ltd | 13/12/2011 |
01543 219 | Daisy Communications Ltd | 13/12/2011 |
01543 22 | Gamma Telecom Holdings Ltd | 19/04/2004 |
01543 230 | Inclarity Communications Limited | 08/11/2012 |
01543 231 | Inclarity Communications Limited | 08/11/2012 |
01543 232 | Inclarity Communications Limited | 08/11/2012 |
01543 235 | Inclarity Communications Limited | 08/11/2012 |
01543 240 | Linear Telecoms Limited | 12/10/2010 |
01543 241 | Invoco Ltd | 26/09/2011 |
01543 242 | Hello Telecom (UK) Limited | 10/11/2011 |
01543 243 | Internexus Networks Limited | 21/11/2011 |
01543 245 | Bicom Systems EURL | 02/03/2012 |
01543 25 | BT | 15/07/1994 |
01543 26 | BT | 15/07/1994 |
01543 27 | BT | 15/07/1994 |
01543 28 | Syntec Limited | 20/12/2005 |
01543 300 | Virgin Media Limited | 27/07/2012 |
01543 301 | Virgin Media Limited | 27/07/2012 |
01543 302 | Virgin Media Limited | 27/07/2012 |
01543 303 | Virgin Media Limited | 27/07/2012 |
01543 304 | Virgin Media Limited | 27/07/2012 |
01543 305 | Virgin Media Limited | 27/07/2012 |
01543 306 | Virgin Media Limited | 27/07/2012 |
01543 307 | Virgin Media Limited | 27/07/2012 |
01543 308 | Virgin Media Limited | 27/07/2012 |
01543 309 | Virgin Media Limited | 27/07/2012 |
01543 31 | Virgin Media Limited | 03/09/1999 |
01543 32 | Sky UK Limited | 02/07/2013 |
01543 33 | Affiniti Integrated Solutions Limited | 07/02/2002 |
01543 346 | GTT-EMEA LTD | 14/10/2021 |
01543 347 | GTT-EMEA LTD | 14/10/2021 |
01543 349 | GTT-EMEA LTD | 14/10/2021 |
01543 35 | Served Up Limited | 27/05/2008 |
01543 36 | BT | 15/07/1994 |
01543 37 | BT | 15/07/1994 |
01543 380 | Sky UK Limited | 24/05/2019 |
01543 381 | 24 SEVEN CLOUD COMMUNICATIONS LTD | 17/01/2020 |
01543 382 | Sky UK Limited | 08/09/2020 |
01543 383 | SiPalto Ltd | 29/05/2020 |
01543 384 | Colt Technology Services | 26/07/2021 |
01543 385 | ICUK Computing Services Limited | 05/06/2020 |
01543 386 | BT | 23/09/2020 |
01543 387 | BT | 12/04/2021 |
01543 388 | Belgacom International Carrier Services SA | 14/10/2019 |
01543 389 | Sky UK Limited | 04/08/2021 |
01543 390 | Dial 9 Communications Limited | 10/12/2019 |
01543 391 | Lanonyx Telecom Limited | 10/08/2021 |
01543 392 | Mi Telecom Limited | 03/07/2020 |
01543 393 | VOXYONDER NETWORK SERVICES UK LTD | 10/09/2020 |
01543 395 | Gamma Telecom Holdings Ltd | 01/06/2021 |
01543 396 | Gamma Telecom Holdings Ltd | 03/05/2019 |
01543 397 | Spitfire Network Services Limited | 10/11/2011 |
01543 398 | Gamma Telecom Holdings Ltd | 12/10/2020 |
01543 399 | Gamma Telecom Holdings Ltd | 09/03/2020 |
01543 40 | Vodafone Ltd (C&W) | 05/09/2013 |
01543 41 | BT | 15/07/1994 |
01543 42 | BT | 15/07/1994 |
01543 43 | BT | 15/07/1994 |
01543 44 | BT | 15/07/1994 |
01543 45 | BT | 15/07/1994 |
01543 46 | BT | 15/07/1994 |
01543 47 | BT | 15/07/1994 |
01543 48 | BT | 15/07/1994 |
01543 49 | BT | 15/07/1994 |
01543 50 | BT | 15/07/1994 |
01543 51 | BT | 17/02/1995 |
01543 520 | TalkTalk Communications Limited | 23/10/2014 |
01543 521 | API Telecom Limited | 30/03/2012 |
01543 522 | ICC Networks Ltd | 17/04/2012 |
01543 523 | TalkTalk Communications Limited | 27/07/2012 |
01543 524 | Simwood eSMS Limited | 01/05/2012 |
01543 525 | Ziron Limited | 01/08/2012 |
01543 526 | IOVOX Limited | 03/07/2012 |
01543 528 | Content Guru Limited | 12/10/2012 |
01543 529 | TalkTalk Communications Limited | 24/01/2013 |
01543 530 | Vodafone Ltd (Thus) | 04/01/2012 |
01543 531 | Vodafone Ltd (Thus) | 04/01/2012 |
01543 532 | Vodafone Ltd (Thus) | 04/01/2012 |
01543 533 | Vodafone Ltd (Thus) | 04/01/2012 |
01543 534 | Vodafone Ltd (Thus) | 04/01/2012 |
01543 535 | Vodafone Ltd (Thus) | 04/01/2012 |
01543 539 | Vodafone Ltd (Thus) | 04/01/2012 |
01543 540 | Digitech Solutions Global Limited | 27/04/2010 |
01543 541 | Calltracks Limited | 20/09/2013 |
01543 542 | Core Telecom Limited | 05/08/2010 |
01543 543 | Telappliant Ltd | 16/06/2010 |
01543 544 | Windsor Telecom Ltd | 22/07/2010 |
01543 545 | Suretec Systems Ltd | 06/05/2010 |
01543 546 | Numbergroup Utilities Ltd | 08/11/2010 |
01543 547 | Inet Telecoms Ltd (Voipfone) | 19/08/2010 |
01543 548 | VoiceHost Limited | 05/10/2010 |
01543 549 | Telephone Box Limited | 10/12/2010 |
01543 550 | Vodafone Ltd (C&W) | 29/06/2018 |
01543 558 | Vodafone Ltd (C&W) | 10/08/2015 |
01543 559 | Vodafone Ltd (C&W) | 10/08/2015 |
01543 56 | TTNC Limited | 11/11/2013 |
01543 57 | BT | 15/07/1994 |
01543 58 | FleXtel Limited | 21/10/2005 |
01543 59 | TelNG Limited | 28/02/2007 |
01543 60 | Barritel Limited | 17/08/2006 |
01543 620 | Localphone Limited | 04/05/2007 |
01543 621 | (AQ) LIMITED | 19/10/2011 |
01543 622 | Voiceflex Limited | 30/07/2007 |
01543 623 | VoIP-Un Limited | 31/10/2007 |
01543 624 | AQL Wholesale Ltd | 04/01/2008 |
01543 625 | Digital Space Group Limited | 15/03/2016 |
01543 627 | Lumen Technologies UK Limited | 23/04/2008 |
01543 628 | TelXL Ltd | 12/02/2008 |
01543 629 | Nationwide Telephone Assistance Ltd | 01/10/2007 |
01543 630 | Six Degrees Technology Group Limited | 13/01/2020 |
01543 634 | Six Degrees Technology Group Limited | 13/01/2020 |
01543 640 | Digital Space Group Limited | 30/04/2008 |
01543 641 | Nodemax Limited | 07/07/2008 |
01543 642 | TalkTalk Communications Limited | 12/02/2013 |
01543 643 | Telecom2 Limited | 11/09/2009 |
01543 644 | Net-Work Internet Ltd | 29/04/2008 |
01543 647 | Solutios Limited | 27/10/2008 |
01543 648 | Voxbone SA | 23/09/2008 |
01543 65 | Vodafone Ltd (Energis) | 26/05/2006 |
01543 66 | GCI Network Solutions Ltd | 02/05/2017 |
01543 67 | BT | 15/07/1994 |
01543 68 | BT | 15/07/1994 |
01543 690 | Resilient PLC | 18/05/2012 |
01543 691 | Resilient PLC | 18/05/2012 |
01543 699 | Resilient PLC | 18/05/2012 |
01543 700 | Mars Communications Limited | 03/02/2009 |
01543 701 | IPV6 Limited | 12/02/2009 |
01543 702 | Andrews & Arnold (Numbers) Ltd | 19/03/2009 |
01543 703 | Telecoms World PLC | 15/04/2009 |
01543 704 | Invade International Ltd | 12/01/2016 |
01543 707 | Chess Limited | 06/04/2018 |
01543 708 | CFL Communications Ltd | 13/07/2009 |
01543 709 | Vectone Mobile Limited | 29/06/2009 |
01543 710 | Nexus Telecommunications Limited | 28/09/2009 |
01543 711 | GCI Network Solutions Ltd | 25/04/2017 |
01543 712 | I-NET COMMUNICATIONS GROUP PLC | 13/01/2010 |
01543 713 | Buzz Networks Limited | 01/03/2010 |
01543 714 | Atomstream Limited | 24/03/2010 |
01543 716 | Phone Co-Op Numbering Limited | 22/12/2010 |
01543 718 | Invosys Limited | 11/04/2012 |
01543 719 | Nexbridge Communications Limited | 07/03/2012 |
01543 720 | Minotaur Telecom Limited | 01/02/2013 |
01543 721 | Orbtalk Limited | 19/09/2011 |
01543 722 | IP Wholesale Limited | 01/06/2017 |
01543 725 | TGL Services (UK) Ltd | 02/02/2015 |
01543 726 | Media Hawk Ltd | 19/04/2013 |
01543 727 | iHub 2 Limited | 18/05/2016 |
01543 728 | BT | 16/12/2014 |
01543 729 | Updata Infrastructure (UK) Limited | 09/03/2015 |
01543 730 | YayYay Limited | 23/04/2015 |
01543 731 | M247 Ltd | 29/05/2015 |
01543 732 | Kalnet4U Ltd | 22/05/2013 |
01543 733 | Intrado Cloud Solutions Limited | 15/01/2013 |
01543 734 | Affiniti Integrated Solutions Limited | 09/02/2015 |
01543 735 | Colt Technology Services | 27/04/2015 |
01543 737 | Redwood Technologies Ltd | 15/11/2018 |
01543 738 | Sky UK Limited | 02/09/2015 |
01543 739 | XoverX Ltd | 02/05/2013 |
01543 741 | Sky UK Limited | 30/03/2016 |
01543 742 | TalkTalk Communications Limited | 30/08/2016 |
01543 743 | Adepteo Limited | 21/12/2016 |
01543 745 | Sky UK Limited | 03/10/2016 |
01543 746 | Calltracks Limited | 23/12/2016 |
01543 747 | I.T Communications Limited | 26/10/2016 |
01543 748 | IOVOX Limited | 23/12/2016 |
01543 749 | Number Services Ltd. | 22/11/2018 |
01543 750 | Zapappi Ltd | 19/10/2017 |
01543 751 | Sky UK Limited | 25/08/2017 |
01543 752 | Entanet International Ltd | 12/12/2017 |
01543 753 | Colt Technology Services | 23/02/2018 |
01543 754 | TalkTalk Communications Limited | 31/07/2018 |
01543 755 | IP Voice Networks Ltd | 20/09/2017 |
01543 756 | Gamma Telecom Holdings Ltd | 11/09/2018 |
01543 757 | Fuse 2 Communications Ltd | 03/07/2017 |
01543 758 | BT | 24/04/2019 |
01543 759 | Club Communications Ltd | 31/07/2018 |
01543 80 | Verizon UK Limited | 29/03/2007 |
01543 82 | Virgin Media Limited | 17/03/2016 |
01543 830 | Vodafone Ltd (C&W) | 05/09/2013 |
01543 831 | Vodafone Ltd (C&W) | 05/09/2013 |
01543 832 | Vodafone Ltd (C&W) | 05/09/2013 |
01543 833 | Vodafone Ltd (C&W) | 05/09/2013 |
01543 834 | Vodafone Ltd (C&W) | 05/09/2013 |
01543 835 | Vodafone Ltd (C&W) | 05/09/2013 |
01543 836 | Vodafone Ltd (C&W) | 05/09/2013 |
01543 87 | BT | 15/07/1994 |
01543 88 | Magrathea Telecommunications Limited | 24/09/2004 |
01543 897 | TalkTalk Communications Limited | 20/01/2012 |
01543 898 | TalkTalk Communications Limited | 20/01/2012 |
01543 899 | TalkTalk Communications Limited | 20/01/2012 |