| 01422 14 | Virgin Media Limited | 18/03/2016 | 
| 01422 20 | BT | 15/07/1994 | 
| 01422 22 | Affiniti Integrated Solutions Limited | 22/03/1995 | 
| 01422 23 | BT | 15/07/1994 | 
| 01422 24 | BT | 15/07/1994 | 
| 01422 25 | Virgin Media Limited | 18/03/2016 | 
| 01422 26 | Virgin Media Limited | 18/03/2016 | 
| 01422 27 | GCI Network Solutions Ltd | 25/04/2017 | 
| 01422 28 | Affiniti Integrated Solutions Limited | 15/07/1994 | 
| 01422 290 | Linear Telecoms Limited | 08/10/2010 | 
| 01422 291 | Ziron Limited | 30/07/2012 | 
| 01422 292 | TalkTalk Communications Limited | 13/09/2012 | 
| 01422 293 | Media Hawk Ltd | 11/04/2013 | 
| 01422 294 | Numbers Plus Ltd | 14/02/2013 | 
| 01422 295 | XoverX Ltd | 30/04/2013 | 
| 01422 296 | Intrado Cloud Solutions Limited | 15/01/2013 | 
| 01422 297 | Content Guru Limited | 15/10/2012 | 
| 01422 298 | IOVOX Limited | 03/07/2012 | 
| 01422 30 | BT | 15/07/1994 | 
| 01422 31 | BT | 15/07/1994 | 
| 01422 32 | BT | 15/07/1994 | 
| 01422 33 | BT | 15/07/1994 | 
| 01422 34 | BT | 15/07/1994 | 
| 01422 35 | BT | 15/07/1994 | 
| 01422 36 | BT | 15/07/1994 | 
| 01422 37 | BT | 15/07/1994 | 
| 01422 38 | BT | 15/07/1994 | 
| 01422 39 | BT | 15/07/1994 | 
| 01422 40 | AQL Wholesale Ltd | 01/11/2004 | 
| 01422 41 | Gamma Telecom Holdings Ltd | 08/02/2005 | 
| 01422 42 | BT | 11/07/1995 | 
| 01422 43 | BT | 12/11/1996 | 
| 01422 440 | Virgin Media Limited | 29/06/2012 | 
| 01422 444 | Virgin Media Limited | 29/06/2012 | 
| 01422 445 | Virgin Media Limited | 29/06/2012 | 
| 01422 446 | Virgin Media Limited | 29/06/2012 | 
| 01422 447 | Virgin Media Limited | 29/06/2012 | 
| 01422 448 | Virgin Media Limited | 29/06/2012 | 
| 01422 449 | Virgin Media Limited | 29/06/2012 | 
| 01422 450 | Vodafone Ltd (C&W) | 10/09/2013 | 
| 01422 451 | Vodafone Ltd (C&W) | 10/09/2013 | 
| 01422 452 | Vodafone Ltd (C&W) | 10/09/2013 | 
| 01422 453 | Vodafone Ltd (C&W) | 10/09/2013 | 
| 01422 454 | Vodafone Ltd (C&W) | 10/09/2013 | 
| 01422 455 | Vodafone Ltd (C&W) | 10/09/2013 | 
| 01422 456 | Vodafone Ltd (C&W) | 10/09/2013 | 
| 01422 46 | TGL Services (UK) Ltd | 02/02/2015 | 
| 01422 470 | Dial 9 Communications Limited | 10/12/2019 | 
| 01422 471 | Sky UK Limited | 09/11/2015 | 
| 01422 472 | Sky UK Limited | 09/11/2015 | 
| 01422 473 | Sky UK Limited | 08/09/2020 | 
| 01422 474 | Adepteo Limited | 17/01/2017 | 
| 01422 475 | Number Services Ltd. | 22/11/2018 | 
| 01422 476 | IOVOX Limited | 12/12/2016 | 
| 01422 478 | I.T Communications Limited | 19/04/2016 | 
| 01422 479 | Fuse 2 Communications Ltd | 03/07/2017 | 
| 01422 480 | ICUK Computing Services Limited | 20/09/2019 | 
| 01422 481 | Orange Business Holdings UK Limited | 06/09/2021 | 
| 01422 482 | SiPalto Ltd | 29/05/2020 | 
| 01422 484 | Colt Technology Services | 07/01/2021 | 
| 01422 493 | Digital Space Group Limited | 12/04/2016 | 
| 01422 50 | Vodafone Ltd (Energis) | 26/05/2006 | 
| 01422 510 | Virgin Media Limited | 18/03/2016 | 
| 01422 511 | Virgin Media Limited | 18/03/2016 | 
| 01422 512 | Virgin Media Limited | 18/03/2016 | 
| 01422 513 | Virgin Media Limited | 18/03/2016 | 
| 01422 514 | Virgin Media Limited | 18/03/2016 | 
| 01422 515 | Virgin Media Limited | 18/03/2016 | 
| 01422 518 | Virgin Media Limited | 18/03/2016 | 
| 01422 520 | Calltracks Limited | 20/09/2013 | 
| 01422 521 | Core Telecom Limited | 05/08/2010 | 
| 01422 522 | Windsor Telecom Ltd | 21/07/2010 | 
| 01422 523 | Media Telecom Ltd | 05/08/2010 | 
| 01422 524 | VoiceHost Limited | 27/09/2010 | 
| 01422 525 | Simwood eSMS Limited | 09/08/2010 | 
| 01422 526 | Telephone Box Limited | 25/11/2010 | 
| 01422 527 | Relax Telecom Limited | 15/08/2014 | 
| 01422 529 | Phone Co-Op Numbering Limited | 22/12/2010 | 
| 01422 530 | Six Degrees Technology Group Limited | 14/01/2020 | 
| 01422 534 | Six Degrees Technology Group Limited | 14/01/2020 | 
| 01422 54 | Served Up Limited | 19/05/2008 | 
| 01422 550 | VOXYONDER NETWORK SERVICES UK LTD | 10/09/2020 | 
| 01422 552 | BT | 07/01/2020 | 
| 01422 553 | BT | 09/03/2020 | 
| 01422 555 | Mi Telecom Limited | 03/07/2020 | 
| 01422 557 | Gamma Telecom Holdings Ltd | 11/12/2019 | 
| 01422 558 | Belgacom International Carrier Services SA | 31/01/2020 | 
| 01422 570 | Digitech Solutions Global Limited | 25/06/2012 | 
| 01422 571 | Digitech Solutions Global Limited | 25/06/2012 | 
| 01422 572 | Digitech Solutions Global Limited | 25/06/2012 | 
| 01422 58 | TTNC Limited | 11/11/2013 | 
| 01422 605 | GTT-EMEA LTD | 13/10/2021 | 
| 01422 606 | GTT-EMEA LTD | 13/10/2021 | 
| 01422 607 | GTT-EMEA LTD | 13/10/2021 | 
| 01422 61 | Sky UK Limited | 02/07/2013 | 
| 01422 63 | TelNG Limited | 27/02/2007 | 
| 01422 646 | TalkTalk Communications Limited | 19/01/2012 | 
| 01422 647 | TalkTalk Communications Limited | 19/01/2012 | 
| 01422 648 | TalkTalk Communications Limited | 19/01/2012 | 
| 01422 649 | TalkTalk Communications Limited | 19/01/2012 | 
| 01422 650 | Localphone Limited | 03/05/2007 | 
| 01422 651 | Barritel Limited | 07/06/2007 | 
| 01422 652 | Voiceflex Limited | 30/07/2007 | 
| 01422 653 | (AQ) LIMITED | 11/09/2012 | 
| 01422 656 | Redcentric Solutions Limited | 05/06/2015 | 
| 01422 657 | Net-Work Internet Ltd | 24/09/2007 | 
| 01422 658 | VoIP-Un Limited | 29/10/2007 | 
| 01422 659 | Nationwide Telephone Assistance Ltd | 01/10/2007 | 
| 01422 66 | Citrus Telecommunications Ltd | 11/04/2006 | 
| 01422 677 | Spitfire Network Services Limited | 10/11/2011 | 
| 01422 690 | Resilient PLC | 18/05/2012 | 
| 01422 691 | Resilient PLC | 18/05/2012 | 
| 01422 699 | Resilient PLC | 18/05/2012 | 
| 01422 700 | Digital Space Group Limited | 15/03/2016 | 
| 01422 701 | TelXL Ltd | 12/02/2008 | 
| 01422 702 | Voxbone SA | 18/01/2008 | 
| 01422 703 | Telecom2 Limited | 11/09/2009 | 
| 01422 705 | Nodemax Limited | 15/07/2008 | 
| 01422 706 | TalkTalk Communications Limited | 12/02/2013 | 
| 01422 708 | Digital Space Group Limited | 30/11/2007 | 
| 01422 709 | Solutios Limited | 07/10/2008 | 
| 01422 710 | Mars Communications Limited | 12/02/2009 | 
| 01422 711 | IPV6 Limited | 04/02/2009 | 
| 01422 713 | TalkTalk Communications Limited | 07/04/2015 | 
| 01422 714 | Andrews & Arnold (Numbers) Ltd | 05/03/2009 | 
| 01422 715 | Nexus Telecommunications Limited | 07/04/2009 | 
| 01422 716 | Dynamic Mobile Billing Limited | 08/04/2009 | 
| 01422 717 | Telecoms World PLC | 13/03/2009 | 
| 01422 718 | Nexbridge Communications Limited | 07/03/2012 | 
| 01422 719 | Invade International Ltd | 12/01/2016 | 
| 01422 720 | CFL Communications Ltd | 10/07/2009 | 
| 01422 722 | Vectone Mobile Limited | 30/06/2009 | 
| 01422 723 | GCI Network Solutions Ltd | 19/04/2017 | 
| 01422 724 | I-NET COMMUNICATIONS GROUP PLC | 12/01/2010 | 
| 01422 727 | Gamma Telecom Holdings Ltd | 11/03/2021 | 
| 01422 728 | Inet Telecoms Ltd (Voipfone) | 30/11/2009 | 
| 01422 729 | E164 Ltd | 01/03/2010 | 
| 01422 730 | Buzz Networks Limited | 01/03/2010 | 
| 01422 731 | Digitech Solutions Global Limited | 24/03/2010 | 
| 01422 732 | Atomstream Limited | 22/03/2010 | 
| 01422 733 | Suretec Systems Ltd | 06/05/2010 | 
| 01422 734 | Telappliant Ltd | 02/06/2010 | 
| 01422 735 | Numbergroup Utilities Ltd | 02/11/2010 | 
| 01422 736 | IP Wholesale Limited | 01/06/2017 | 
| 01422 737 | Invosys Limited | 26/01/2012 | 
| 01422 739 | 24 SEVEN CLOUD COMMUNICATIONS LTD | 30/09/2019 | 
| 01422 740 | Orbtalk Limited | 12/09/2011 | 
| 01422 743 | Minotaur Telecom Limited | 04/02/2013 | 
| 01422 744 | Hello Telecom (UK) Limited | 10/11/2011 | 
| 01422 745 | Internexus Networks Limited | 21/11/2011 | 
| 01422 746 | API Telecom Limited | 29/03/2012 | 
| 01422 747 | Invoco Ltd | 22/09/2011 | 
| 01422 748 | ICC Networks Ltd | 13/04/2012 | 
| 01422 749 | Bicom Systems EURL | 02/03/2012 | 
| 01422 750 | TalkTalk Communications Limited | 03/09/2013 | 
| 01422 751 | TalkTalk Communications Limited | 20/06/2014 | 
| 01422 752 | Kalnet4U Ltd | 16/05/2013 | 
| 01422 753 | Lanonyx Telecom Limited | 02/03/2015 | 
| 01422 754 | Colt Technology Services | 17/04/2015 | 
| 01422 755 | iHub 2 Limited | 18/05/2016 | 
| 01422 756 | YayYay Limited | 23/04/2015 | 
| 01422 757 | Redwood Technologies Ltd | 15/11/2018 | 
| 01422 758 | M247 Ltd | 29/05/2015 | 
| 01422 759 | Alnitak GmbH | 03/03/2017 | 
| 01422 760 | TalkTalk Communications Limited | 13/04/2018 | 
| 01422 761 | Gamma Telecom Holdings Ltd | 17/07/2018 | 
| 01422 762 | NFON UK Ltd | 18/07/2018 | 
| 01422 763 | BT | 23/07/2018 | 
| 01422 764 | Sky UK Limited | 02/10/2018 | 
| 01422 765 | Media Hawk Ltd | 14/01/2019 | 
| 01422 766 | Colt Technology Services | 28/02/2018 | 
| 01422 767 | Club Communications Ltd | 03/07/2018 | 
| 01422 768 | BT | 27/06/2019 | 
| 01422 769 | Gamma Telecom Holdings Ltd | 08/01/2021 | 
| 01422 770 | Antheus Telecom Limited | 23/08/2017 | 
| 01422 771 | IP Voice Networks Ltd | 20/09/2017 | 
| 01422 772 | Entanet International Ltd | 05/12/2017 | 
| 01422 773 | Zapappi Ltd | 05/01/2018 | 
| 01422 774 | DIDWW Ireland Limited | 18/01/2019 | 
| 01422 800 | Vodafone Ltd (Thus) | 16/01/2012 | 
| 01422 801 | Vodafone Ltd (Thus) | 16/01/2012 | 
| 01422 802 | Vodafone Ltd (Thus) | 16/01/2012 | 
| 01422 806 | Vodafone Ltd (Thus) | 16/01/2012 | 
| 01422 809 | Vodafone Ltd (Thus) | 16/01/2012 | 
| 01422 81 | FleXtel Limited | 26/10/2005 | 
| 01422 82 | BT | 15/07/1994 | 
| 01422 83 | BT | 15/07/1994 | 
| 01422 84 | BT | 15/07/1994 | 
| 01422 85 | Syntec Limited | 22/11/2005 | 
| 01422 86 | Vodafone Ltd (C&W) | 10/09/2013 | 
| 01422 870 | Inclarity Communications Limited | 21/01/2014 | 
| 01422 871 | Inclarity Communications Limited | 21/01/2014 | 
| 01422 875 | Inclarity Communications Limited | 21/01/2014 | 
| 01422 88 | BT | 15/07/1994 | 
| 01422 89 | Magrathea Telecommunications Limited | 24/09/2004 |