| 01622 20 | Virgin Media Limited | 17/03/2016 |
| 01622 21 | Virgin Media Limited | 17/03/2016 |
| 01622 22 | Virgin Media Limited | 17/03/2016 |
| 01622 23 | Gamma Telecom Holdings Ltd | 13/03/2004 |
| 01622 240 | Inclarity Communications Limited | 06/12/2010 |
| 01622 241 | Inclarity Communications Limited | 06/12/2010 |
| 01622 242 | Inclarity Communications Limited | 06/12/2010 |
| 01622 244 | Invosys Limited | 15/02/2012 |
| 01622 245 | Inclarity Communications Limited | 06/12/2010 |
| 01622 246 | IP Wholesale Limited | 01/06/2017 |
| 01622 247 | Minotaur Telecom Limited | 31/01/2013 |
| 01622 248 | Nexbridge Communications Limited | 08/03/2012 |
| 01622 249 | Sky UK Limited | 08/09/2020 |
| 01622 25 | Redcentric Solutions Limited | 05/06/2015 |
| 01622 26 | GCI Network Solutions Ltd | 02/05/2017 |
| 01622 270 | Linear Telecoms Limited | 14/10/2010 |
| 01622 271 | Hello Telecom (UK) Limited | 17/11/2011 |
| 01622 272 | Internexus Networks Limited | 21/11/2011 |
| 01622 273 | Bicom Systems EURL | 01/03/2012 |
| 01622 275 | API Telecom Limited | 05/04/2012 |
| 01622 276 | ICC Networks Ltd | 17/04/2012 |
| 01622 277 | Invoco Ltd | 02/11/2011 |
| 01622 278 | Simwood eSMS Limited | 01/02/2012 |
| 01622 279 | IOVOX Limited | 04/07/2012 |
| 01622 290 | TalkTalk Communications Limited | 12/02/2019 |
| 01622 291 | Gamma Telecom Holdings Ltd | 11/09/2019 |
| 01622 292 | DIDWW Ireland Limited | 21/01/2019 |
| 01622 293 | Mission Labs Limited | 07/03/2019 |
| 01622 294 | Infinity Tracking Ltd | 22/03/2019 |
| 01622 295 | Infinity Tracking Ltd | 09/04/2019 |
| 01622 296 | TalkTalk Communications Limited | 31/08/2011 |
| 01622 297 | TalkTalk Communications Limited | 31/08/2011 |
| 01622 298 | TalkTalk Communications Limited | 31/08/2011 |
| 01622 299 | TalkTalk Communications Limited | 31/08/2011 |
| 01622 301 | Six Degrees Technology Group Limited | 15/01/2020 |
| 01622 304 | Six Degrees Technology Group Limited | 15/01/2020 |
| 01622 306 | Six Degrees Technology Group Limited | 15/01/2020 |
| 01622 31 | Verizon UK Limited | 03/08/2005 |
| 01622 32 | AQL Wholesale Ltd | 01/11/2004 |
| 01622 33 | Vodafone Ltd (Energis) | 26/05/2006 |
| 01622 34 | Vodafone Ltd (C&W) | 06/09/2013 |
| 01622 35 | BT | 15/07/1994 |
| 01622 36 | FleXtel Limited | 17/06/2005 |
| 01622 370 | WAVECREST NETWORKS LIMITED | 16/12/2019 |
| 01622 371 | WAVECREST NETWORKS LIMITED | 16/12/2019 |
| 01622 372 | WAVECREST NETWORKS LIMITED | 16/12/2019 |
| 01622 38 | Citrus Telecommunications Ltd | 09/08/2005 |
| 01622 390 | VOXYONDER NETWORK SERVICES UK LTD | 10/09/2020 |
| 01622 391 | Gamma Telecom Holdings Ltd | 02/05/2017 |
| 01622 392 | Voiceflex Limited | 01/06/2017 |
| 01622 393 | Affiniti Integrated Solutions Limited | 27/01/2017 |
| 01622 394 | Sky UK Limited | 08/06/2017 |
| 01622 395 | IP Voice Networks Ltd | 20/09/2017 |
| 01622 396 | Media Hawk Ltd | 23/10/2017 |
| 01622 397 | Gamma Telecom Holdings Ltd | 16/11/2017 |
| 01622 398 | Entanet International Ltd | 05/12/2017 |
| 01622 399 | Number Services Ltd. | 22/11/2018 |
| 01622 40 | BT | 12/04/1995 |
| 01622 41 | TTNC Limited | 12/11/2013 |
| 01622 420 | Alnitak GmbH | 14/01/2016 |
| 01622 421 | Belgacom International Carrier Services SA | 20/06/2016 |
| 01622 423 | Gamma Telecom Holdings Ltd | 21/06/2016 |
| 01622 424 | I.T Communications Limited | 01/02/2016 |
| 01622 425 | Adepteo Limited | 06/12/2016 |
| 01622 426 | Zapappi Ltd | 26/10/2017 |
| 01622 427 | Gamma Telecom Holdings Ltd | 04/11/2016 |
| 01622 428 | Fuse 2 Communications Ltd | 03/07/2017 |
| 01622 43 | Sky UK Limited | 01/07/2013 |
| 01622 45 | TGL Services (UK) Ltd | 02/02/2015 |
| 01622 464 | TelXL Ltd | 27/07/2011 |
| 01622 469 | TelXL Ltd | 27/07/2011 |
| 01622 470 | VoiceHost Limited | 22/06/2010 |
| 01622 472 | Numbers Plus Ltd | 28/07/2011 |
| 01622 473 | Media Hawk Ltd | 26/09/2011 |
| 01622 474 | Orbtalk Limited | 16/09/2011 |
| 01622 476 | BT | 17/12/2020 |
| 01622 477 | Gamma Telecom Holdings Ltd | 17/12/2020 |
| 01622 478 | Gamma Telecom Holdings Ltd | 24/08/2020 |
| 01622 48 | TelNG Limited | 28/02/2007 |
| 01622 49 | Syntec Limited | 01/11/2005 |
| 01622 513 | Digital Space Group Limited | 12/04/2016 |
| 01622 520 | Localphone Limited | 10/05/2007 |
| 01622 521 | Barritel Limited | 06/06/2007 |
| 01622 522 | Voiceflex Limited | 30/07/2007 |
| 01622 523 | (AQ) LIMITED | 12/09/2012 |
| 01622 524 | VoIP-Un Limited | 01/11/2007 |
| 01622 526 | Digital Space Group Limited | 15/03/2016 |
| 01622 527 | Telecom2 Limited | 10/09/2009 |
| 01622 528 | Affiniti Integrated Solutions Limited | 22/11/2007 |
| 01622 529 | Nationwide Telephone Assistance Ltd | 02/10/2007 |
| 01622 530 | Digital Space Group Limited | 16/05/2008 |
| 01622 531 | Nodemax Limited | 09/07/2008 |
| 01622 532 | TalkTalk Communications Limited | 13/02/2013 |
| 01622 533 | Net-Work Internet Ltd | 21/07/2008 |
| 01622 534 | Voxbone SA | 23/09/2008 |
| 01622 535 | Inet Telecoms Ltd (Voipfone) | 24/09/2008 |
| 01622 538 | Gamma Telecom Holdings Ltd | 13/10/2008 |
| 01622 539 | Solutios Limited | 05/11/2008 |
| 01622 541 | Vonage Limited | 23/01/2015 |
| 01622 542 | Served Up Limited | 16/10/2008 |
| 01622 543 | IPV6 Limited | 06/02/2009 |
| 01622 544 | Mars Communications Limited | 05/02/2009 |
| 01622 545 | Andrews & Arnold (Numbers) Ltd | 25/03/2009 |
| 01622 547 | Telecoms World PLC | 28/04/2009 |
| 01622 548 | Vectone Mobile Limited | 30/06/2009 |
| 01622 550 | GTT-EMEA LTD | 15/10/2021 |
| 01622 555 | GTT-EMEA LTD | 15/10/2021 |
| 01622 577 | Spitfire Network Services Limited | 21/07/2011 |
| 01622 580 | Gamma Telecom Holdings Ltd | 14/02/2018 |
| 01622 581 | Telappliant Ltd | 05/04/2018 |
| 01622 582 | Club Communications Ltd | 31/07/2018 |
| 01622 583 | Sky UK Limited | 30/08/2018 |
| 01622 584 | Gamma Telecom Holdings Ltd | 17/09/2018 |
| 01622 585 | BT | 26/10/2018 |
| 01622 586 | ICUK Computing Services Limited | 12/08/2019 |
| 01622 587 | BT | 06/06/2019 |
| 01622 588 | Affiniti Integrated Solutions Limited | 29/10/2018 |
| 01622 589 | Gamma Telecom Holdings Ltd | 03/05/2019 |
| 01622 590 | Resilient PLC | 09/09/2011 |
| 01622 599 | Resilient PLC | 09/09/2011 |
| 01622 60 | BT | 15/07/1994 |
| 01622 61 | Vodafone Ltd (C&W) | 06/09/2013 |
| 01622 62 | BT | 15/07/1994 |
| 01622 63 | BT | 15/07/1994 |
| 01622 640 | Digitech Solutions Global Limited | 26/06/2012 |
| 01622 65 | BT | 15/07/1994 |
| 01622 66 | BT | 15/07/1994 |
| 01622 67 | BT | 15/07/1994 |
| 01622 68 | BT | 15/07/1994 |
| 01622 69 | BT | 15/07/1994 |
| 01622 70 | BT | 15/07/1994 |
| 01622 71 | BT | 15/07/1994 |
| 01622 72 | BT | 15/07/1994 |
| 01622 73 | BT | 15/07/1994 |
| 01622 74 | BT | 15/07/1994 |
| 01622 75 | BT | 15/07/1994 |
| 01622 76 | BT | 15/07/1994 |
| 01622 77 | BT | 15/07/1994 |
| 01622 780 | Lumen Technologies UK Limited | 25/07/2011 |
| 01622 782 | Lumen Technologies UK Limited | 25/07/2011 |
| 01622 783 | Lumen Technologies UK Limited | 25/07/2011 |
| 01622 785 | Lumen Technologies UK Limited | 25/07/2011 |
| 01622 786 | Lumen Technologies UK Limited | 25/07/2011 |
| 01622 789 | Lumen Technologies UK Limited | 25/07/2011 |
| 01622 79 | BT | 15/07/1994 |
| 01622 800 | Magrathea Telecommunications Limited | 16/11/2011 |
| 01622 801 | Magrathea Telecommunications Limited | 16/11/2011 |
| 01622 804 | Magrathea Telecommunications Limited | 16/11/2011 |
| 01622 805 | Magrathea Telecommunications Limited | 16/11/2011 |
| 01622 806 | Magrathea Telecommunications Limited | 16/11/2011 |
| 01622 807 | Magrathea Telecommunications Limited | 16/11/2011 |
| 01622 808 | Magrathea Telecommunications Limited | 16/11/2011 |
| 01622 809 | Magrathea Telecommunications Limited | 16/11/2011 |
| 01622 81 | BT | 15/07/1994 |
| 01622 82 | BT | 15/07/1994 |
| 01622 83 | BT | 15/07/1994 |
| 01622 84 | BT | 15/07/1994 |
| 01622 85 | BT | 15/07/1994 |
| 01622 86 | BT | 15/07/1994 |
| 01622 87 | BT | 15/07/1994 |
| 01622 88 | BT | 15/07/1994 |
| 01622 89 | BT | 15/07/1994 |
| 01622 900 | Optify Mediaforce Limited | 13/05/2009 |
| 01622 901 | CFL Communications Ltd | 14/07/2009 |
| 01622 902 | Orbital Net Limited | 20/07/2009 |
| 01622 904 | Nexus Telecommunications Limited | 28/09/2009 |
| 01622 905 | Invade International Ltd | 12/01/2016 |
| 01622 906 | GCI Network Solutions Ltd | 25/04/2017 |
| 01622 909 | I-NET COMMUNICATIONS GROUP PLC | 13/01/2010 |
| 01622 910 | Buzz Networks Limited | 01/03/2010 |
| 01622 911 | Atomstream Limited | 24/03/2010 |
| 01622 912 | Digitech Solutions Global Limited | 27/04/2010 |
| 01622 913 | Numbergroup Utilities Ltd | 02/11/2010 |
| 01622 914 | Calltracks Limited | 23/09/2013 |
| 01622 915 | Suretec Systems Ltd | 06/05/2010 |
| 01622 916 | Core Telecom Limited | 06/08/2010 |
| 01622 919 | Windsor Telecom Ltd | 29/07/2010 |
| 01622 920 | TalkTalk Communications Limited | 10/01/2014 |
| 01622 921 | Lanonyx Telecom Limited | 03/03/2015 |
| 01622 922 | Redwood Technologies Ltd | 15/11/2018 |
| 01622 924 | TalkTalk Communications Limited | 10/02/2015 |
| 01622 925 | YayYay Limited | 24/04/2015 |
| 01622 926 | Colt Technology Services | 05/05/2015 |
| 01622 927 | Metronet (UK) Limited | 21/05/2019 |
| 01622 930 | Dial 9 Communications Limited | 10/12/2019 |
| 01622 931 | 24 SEVEN CLOUD COMMUNICATIONS LTD | 17/01/2020 |
| 01622 932 | SiPalto Ltd | 03/02/2020 |
| 01622 933 | Colt Technology Services | 29/11/2019 |
| 01622 934 | BT | 30/03/2020 |
| 01622 935 | Mi Telecom Limited | 03/07/2020 |
| 01622 936 | EG TECHNOLOGIES LIMITED | 19/06/2020 |
| 01622 937 | TELNYX UK LIMITED | 07/05/2020 |
| 01622 938 | Gamma Telecom Holdings Ltd | 20/04/2020 |
| 01622 939 | Gamma Telecom Holdings Ltd | 13/02/2020 |
| 01622 940 | Sky UK Limited | 13/04/2021 |
| 01622 941 | Orange Business Holdings UK Limited | 06/09/2021 |
| 01622 942 | BT | 22/09/2021 |
| 01622 944 | Gamma Telecom Holdings Ltd | 22/09/2021 |
| 01622 946 | Gamma Telecom Holdings Ltd | 23/03/2021 |
| 01622 948 | Gamma Telecom Holdings Ltd | 23/06/2021 |
| 01622 960 | Ziron Limited | 30/07/2012 |
| 01622 961 | Liquid 11 Limited | 13/06/2013 |
| 01622 962 | Kalnet4U Ltd | 24/05/2013 |
| 01622 963 | BT | 24/10/2013 |
| 01622 964 | iHub 2 Limited | 18/05/2016 |
| 01622 965 | Affiniti Integrated Solutions Limited | 19/11/2013 |
| 01622 967 | Intrado Cloud Solutions Limited | 19/02/2013 |
| 01622 968 | XoverX Ltd | 30/04/2013 |
| 01622 969 | Content Guru Limited | 12/10/2012 |