01277 20 | BT | 15/07/1994 |
01277 21 | BT | 15/07/1994 |
01277 22 | BT | 15/07/1994 |
01277 23 | BT | 15/07/1994 |
01277 24 | BT | 15/07/1994 |
01277 25 | BT | 15/07/1994 |
01277 26 | BT | 15/07/1994 |
01277 28 | Gamma Telecom Holdings Ltd | 05/04/2004 |
01277 290 | Linear Telecoms Limited | 07/10/2010 |
01277 291 | Internexus Networks Limited | 21/11/2011 |
01277 293 | Bicom Systems EURL | 01/03/2012 |
01277 294 | API Telecom Limited | 26/03/2012 |
01277 295 | TalkTalk Communications Limited | 04/04/2012 |
01277 296 | ICC Networks Ltd | 13/04/2012 |
01277 297 | Ziron Limited | 30/07/2012 |
01277 298 | IOVOX Limited | 02/07/2012 |
01277 299 | Numbergroup Utilities Ltd | 29/04/2019 |
01277 30 | BT | 15/07/1994 |
01277 31 | BT | 02/03/1999 |
01277 32 | BT | 27/08/1998 |
01277 330 | Virgin Media Limited | 28/06/2012 |
01277 331 | Virgin Media Limited | 28/06/2012 |
01277 332 | Virgin Media Limited | 28/06/2012 |
01277 333 | Virgin Media Limited | 28/06/2012 |
01277 334 | Virgin Media Limited | 28/06/2012 |
01277 335 | Virgin Media Limited | 28/06/2012 |
01277 336 | Virgin Media Limited | 28/06/2012 |
01277 339 | Virgin Media Limited | 28/06/2012 |
01277 35 | BT | 15/07/1994 |
01277 36 | BT | 15/07/1994 |
01277 37 | BT | 15/07/1994 |
01277 38 | TGL Services (UK) Ltd | 02/02/2015 |
01277 390 | GTT-EMEA LTD | 14/10/2021 |
01277 396 | GTT-EMEA LTD | 14/10/2021 |
01277 397 | GTT-EMEA LTD | 14/10/2021 |
01277 399 | GTT-EMEA LTD | 14/10/2021 |
01277 40 | Simwood eSMS Limited | 19/07/2006 |
01277 41 | Sky UK Limited | 28/06/2013 |
01277 42 | AQL Wholesale Ltd | 21/06/2006 |
01277 45 | TelNG Limited | 26/02/2007 |
01277 46 | Commi Holdings Limited | 21/11/2016 |
01277 487 | Spitfire Network Services Limited | 09/11/2011 |
01277 490 | Resilient PLC | 18/05/2012 |
01277 491 | Resilient PLC | 18/05/2012 |
01277 499 | Resilient PLC | 18/05/2012 |
01277 500 | TalkTalk Communications Limited | 16/05/2007 |
01277 502 | Localphone Limited | 22/05/2007 |
01277 503 | Voiceflex Limited | 24/07/2007 |
01277 504 | Orange Business Holdings UK Limited | 26/02/2013 |
01277 505 | (AQ) LIMITED | 19/10/2011 |
01277 506 | VoIP-Un Limited | 26/10/2007 |
01277 507 | Digital Space Group Limited | 29/11/2007 |
01277 508 | Affiniti Integrated Solutions Limited | 12/11/2007 |
01277 509 | Voxbone SA | 17/12/2007 |
01277 510 | Telecom2 Limited | 10/09/2009 |
01277 511 | Net-Work Internet Ltd | 28/01/2008 |
01277 512 | Redcentric Solutions Limited | 05/06/2015 |
01277 513 | Nodemax Limited | 08/07/2008 |
01277 514 | TalkTalk Communications Limited | 13/02/2013 |
01277 515 | Solutios Limited | 03/09/2008 |
01277 517 | Barritel Limited | 08/10/2008 |
01277 519 | IPV6 Limited | 29/01/2009 |
01277 521 | Mars Communications Limited | 03/02/2009 |
01277 522 | Digital Space Group Limited | 15/03/2016 |
01277 523 | Inet Telecoms Ltd (Voipfone) | 27/02/2009 |
01277 524 | Andrews & Arnold (Numbers) Ltd | 27/02/2009 |
01277 525 | TalkTalk Communications Limited | 03/03/2009 |
01277 526 | Telecoms World PLC | 12/03/2009 |
01277 528 | Invade International Ltd | 12/01/2016 |
01277 529 | Vectone Mobile Limited | 06/07/2009 |
01277 530 | CFL Communications Ltd | 08/07/2009 |
01277 531 | TeleWare Group PLC | 20/08/2009 |
01277 532 | Vonage Limited | 27/01/2015 |
01277 534 | Nexus Telecommunications Limited | 25/09/2009 |
01277 535 | GCI Network Solutions Ltd | 19/04/2017 |
01277 536 | WIGHTFIBRE LIMITED | 07/01/2010 |
01277 537 | I-NET COMMUNICATIONS GROUP PLC | 15/01/2010 |
01277 539 | Atomstream Limited | 25/02/2010 |
01277 540 | E164 Ltd | 15/04/2010 |
01277 541 | Digitech Solutions Global Limited | 28/04/2010 |
01277 542 | Calltracks Limited | 19/09/2013 |
01277 543 | Core Telecom Limited | 06/08/2010 |
01277 544 | Suretec Systems Ltd | 04/05/2010 |
01277 545 | Windsor Telecom Ltd | 20/07/2010 |
01277 546 | VoiceHost Limited | 27/08/2010 |
01277 548 | Numbergroup Utilities Ltd | 03/12/2010 |
01277 549 | Buzz Networks Limited | 01/03/2010 |
01277 550 | Phone Co-Op Numbering Limited | 16/12/2010 |
01277 551 | Invosys Limited | 09/07/2012 |
01277 552 | Orbtalk Limited | 13/09/2011 |
01277 553 | Hello Telecom (UK) Limited | 01/06/2011 |
01277 554 | Invoco Ltd | 20/09/2011 |
01277 555 | IP Wholesale Limited | 01/06/2017 |
01277 557 | Nexbridge Communications Limited | 06/03/2012 |
01277 559 | Minotaur Telecom Limited | 01/02/2013 |
01277 560 | TalkTalk Communications Limited | 19/02/2013 |
01277 561 | Media Hawk Ltd | 10/04/2013 |
01277 562 | Kalnet4U Ltd | 10/05/2013 |
01277 563 | BT | 07/11/2013 |
01277 564 | Liquid 11 Limited | 13/06/2013 |
01277 565 | iHub 2 Limited | 18/05/2016 |
01277 566 | Intrado Cloud Solutions Limited | 19/02/2013 |
01277 567 | Content Guru Limited | 12/10/2012 |
01277 568 | Colt Technology Services | 12/09/2013 |
01277 569 | XoverX Ltd | 30/04/2013 |
01277 570 | I.T Communications Limited | 19/05/2015 |
01277 571 | M247 Ltd | 29/05/2015 |
01277 572 | YayYay Limited | 23/04/2015 |
01277 574 | Alnitak GmbH | 06/01/2017 |
01277 575 | Affiniti Integrated Solutions Limited | 04/02/2014 |
01277 576 | IOVOX Limited | 23/12/2016 |
01277 577 | Redwood Technologies Ltd | 15/11/2018 |
01277 578 | Entanet International Ltd | 12/12/2017 |
01277 581 | Number Services Ltd. | 22/11/2018 |
01277 582 | Colt Technology Services | 11/05/2017 |
01277 583 | BT | 26/03/2019 |
01277 584 | Gamma Telecom Holdings Ltd | 17/12/2018 |
01277 585 | Adepteo Limited | 17/01/2017 |
01277 590 | Zapappi Ltd | 05/01/2018 |
01277 591 | Calltracks Limited | 14/03/2019 |
01277 592 | Sky UK Limited | 14/06/2019 |
01277 593 | Dial 9 Communications Limited | 09/12/2019 |
01277 595 | IP Voice Networks Ltd | 20/09/2017 |
01277 596 | Belgacom International Carrier Services SA | 03/10/2019 |
01277 597 | Fuse 2 Communications Ltd | 04/07/2017 |
01277 598 | Gamma Telecom Holdings Ltd | 18/07/2019 |
01277 599 | Club Communications Ltd | 03/07/2018 |
01277 60 | Nationwide Telephone Assistance Ltd | 02/09/2005 |
01277 61 | FleXtel Limited | 20/10/2005 |
01277 62 | BT | 15/07/1994 |
01277 63 | BT | 15/07/1994 |
01277 64 | Syntec Limited | 18/11/2005 |
01277 65 | BT | 15/07/1994 |
01277 660 | Lumen Technologies UK Limited | 17/01/2012 |
01277 663 | Lumen Technologies UK Limited | 17/01/2012 |
01277 669 | Lumen Technologies UK Limited | 17/01/2012 |
01277 670 | VOXYONDER NETWORK SERVICES UK LTD | 10/09/2020 |
01277 671 | BT | 30/03/2020 |
01277 672 | Mi Telecom Limited | 03/07/2020 |
01277 673 | Sky UK Limited | 22/12/2020 |
01277 674 | Twilio Ireland Limited | 13/10/2020 |
01277 675 | ICUK Computing Services Limited | 05/06/2020 |
01277 676 | Gamma Telecom Holdings Ltd | 13/02/2020 |
01277 677 | SiPalto Ltd | 17/06/2020 |
01277 678 | Affiniti Integrated Solutions Limited | 27/05/2020 |
01277 679 | DIDWW Ireland Limited | 29/06/2020 |
01277 68 | TGL Services (UK) Ltd | 02/02/2015 |
01277 69 | BT | 15/07/1994 |
01277 700 | Six Degrees Technology Group Limited | 13/01/2020 |
01277 704 | Six Degrees Technology Group Limited | 13/01/2020 |
01277 710 | Lanonyx Telecom Limited | 10/08/2021 |
01277 711 | BT | 27/04/2021 |
01277 714 | Gamma Telecom Holdings Ltd | 08/02/2021 |
01277 716 | Colt Technology Services | 28/06/2021 |
01277 717 | Colt Technology Services | 22/04/2021 |
01277 72 | Vodafone Ltd (C&W) | 24/07/2013 |
01277 73 | Served Up Limited | 09/05/2008 |
01277 74 | Citrus Telecommunications Ltd | 11/04/2006 |
01277 75 | Virgin Media Limited | 17/03/2016 |
01277 760 | Vodafone Ltd (Thus) | 23/01/2012 |
01277 761 | Vodafone Ltd (Thus) | 23/01/2012 |
01277 762 | Vodafone Ltd (Thus) | 23/01/2012 |
01277 763 | Vodafone Ltd (Thus) | 23/01/2012 |
01277 768 | Vodafone Ltd (Thus) | 23/01/2012 |
01277 769 | Vodafone Ltd (Thus) | 23/01/2012 |
01277 77 | Cloud9 Communications Limited | 23/04/2010 |
01277 780 | Inclarity Communications Limited | 16/02/2011 |
01277 781 | Inclarity Communications Limited | 16/02/2011 |
01277 782 | Inclarity Communications Limited | 16/02/2011 |
01277 785 | Inclarity Communications Limited | 16/02/2011 |
01277 79 | GCI Network Solutions Ltd | 20/04/2017 |
01277 80 | TTNC Limited | 11/11/2013 |
01277 81 | BT | 15/07/1994 |
01277 82 | BT | 15/07/1994 |
01277 833 | Digital Space Group Limited | 12/04/2016 |
01277 84 | BT | 15/07/1994 |
01277 850 | Vodafone Ltd (C&W) | 24/07/2013 |
01277 851 | Vodafone Ltd (C&W) | 24/07/2013 |
01277 852 | Vodafone Ltd (C&W) | 25/07/2013 |
01277 853 | Vodafone Ltd (C&W) | 25/07/2013 |
01277 854 | Vodafone Ltd (C&W) | 25/07/2013 |
01277 855 | Vodafone Ltd (C&W) | 25/07/2013 |
01277 859 | Vodafone Ltd (C&W) | 25/07/2013 |
01277 88 | Magrathea Telecommunications Limited | 24/09/2004 |
01277 89 | BT | 15/07/1994 |