This page contains information about which telephone companies the various 01623 numbers are allocated to.
| First Digits | Status | Communications Provider | Number Length | Notes | Change |
|---|---|---|---|---|---|
| 01623 00 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 01 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 02 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 03 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 04 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 05 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 06 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 07 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 08 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 09 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 10 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 11 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 12 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 13 | Allocated | BT | (0)+10 | - | 06/03/2006 |
| 01623 14 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 15 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 16 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 17 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 18 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 19 | Free for National Dialling Only | - | (0)+10 | - | - |
| 01623 200 | Protected | - | 4+6 | - | - |
| 01623 201 | Protected | - | 4+6 | - | - |
| 01623 202 | Protected | - | 4+6 | - | - |
| 01623 203 | Protected | - | 4+6 | - | - |
| 01623 204 | Protected | - | 4+6 | - | - |
| 01623 205 | Protected | - | 4+6 | - | - |
| 01623 206 | Protected | - | 4+6 | - | - |
| 01623 207 | Protected | - | 4+6 | - | - |
| 01623 208 | Protected | - | 4+6 | - | - |
| 01623 209 | Protected | - | 4+6 | - | - |
| 01623 21 | Allocated | TelNG Limited | 4+6 | F-Digit '2' | 28/02/2007 |
| 01623 22 | Allocated | Callagenix Ltd | 4+6 | F-Digit '0' | 20/10/2006 |
| 01623 230 | Allocated | TalkTalk Communications Limited | 4+6 | - | 05/01/2012 |
| 01623 231 | Protected | - | 4+6 | - | - |
| 01623 232 | Allocated | TalkTalk Communications Limited | 4+6 | - | 31/08/2011 |
| 01623 233 | Protected | - | 4+6 | - | - |
| 01623 234 | Protected | - | 4+6 | - | - |
| 01623 235 | Protected | - | 4+6 | - | - |
| 01623 236 | Protected | - | 4+6 | - | - |
| 01623 237 | Allocated | TalkTalk Communications Limited | 4+6 | - | 31/08/2011 |
| 01623 238 | Allocated | TalkTalk Communications Limited | 4+6 | - | 31/08/2011 |
| 01623 239 | Allocated | TalkTalk Communications Limited | 4+6 | - | 31/08/2011 |
| 01623 24 | Allocated | TTNC Limited | 4+6 | F-Digits '0,1,2,3,4,5,6,7,8,9' | 21/09/2006 |
| 01623 250 | Protected | - | 4+6 | - | - |
| 01623 251 | Protected | - | 4+6 | - | - |
| 01623 252 | Protected | - | 4+6 | - | - |
| 01623 253 | Allocated | Coms.Com Ltd | 4+6 | - | 08/06/2011 |
| 01623 254 | Protected | - | 4+6 | - | - |
| 01623 255 | Protected | - | 4+6 | - | - |
| 01623 256 | Protected | - | 4+6 | - | - |
| 01623 257 | Protected | - | 4+6 | - | - |
| 01623 258 | Protected | - | 4+6 | - | - |
| 01623 259 | Protected | - | 4+6 | - | - |
| 01623 260 | Protected | - | 4+6 | - | - |
| 01623 261 | Protected | - | 4+6 | - | - |
| 01623 262 | Protected | - | 4+6 | - | - |
| 01623 263 | Protected | - | 4+6 | - | - |
| 01623 264 | Protected | - | 4+6 | - | - |
| 01623 265 | Protected | - | 4+6 | - | - |
| 01623 266 | Protected | - | 4+6 | - | - |
| 01623 267 | Protected | - | 4+6 | - | - |
| 01623 268 | Protected | - | 4+6 | - | - |
| 01623 269 | Protected | - | 4+6 | - | - |
| 01623 270 | Allocated | Localphone Limited | 4+6 | - | 10/05/2007 |
| 01623 271 | Allocated | Barritel Limited | 4+6 | - | 06/06/2007 |
| 01623 272 | Allocated | Telephony Services Limited | 4+6 | - | 20/12/2007 |
| 01623 273 | Allocated | Teledesign Ltd | 4+6 | - | 17/09/2007 |
| 01623 274 | Allocated | Premium O Limited | 4+6 | - | 14/01/2008 |
| 01623 275 | Allocated | VoIP-Un Limited | 4+6 | - | 01/11/2007 |
| 01623 276 | Allocated | TelXL Ltd | 4+6 | - | 12/02/2008 |
| 01623 277 | Allocated | Frontier Systems Ltd | 4+6 | - | 30/07/2007 |
| 01623 278 | Allocated | (aq) Limited trading as aql | 4+6 | - | 21/09/2007 |
| 01623 279 | Allocated | Nationwide Telephone Assistance Ltd | 4+6 | - | 02/10/2007 |
| 01623 280 | Protected | - | 4+6 | - | - |
| 01623 281 | Protected | - | 4+6 | - | - |
| 01623 282 | Protected | - | 4+6 | - | - |
| 01623 283 | Protected | - | 4+6 | - | - |
| 01623 284 | Protected | - | 4+6 | - | - |
| 01623 285 | Protected | - | 4+6 | - | - |
| 01623 286 | Protected | - | 4+6 | - | - |
| 01623 287 | Allocated | Spitfire Network Services Ltd | 4+6 | - | 21/07/2011 |
| 01623 288 | Protected | - | 4+6 | - | - |
| 01623 289 | Protected | - | 4+6 | - | - |
| 01623 290 | Allocated | Resilient Networks Plc | 4+6 | - | 09/09/2011 |
| 01623 291 | Protected | - | 4+6 | - | - |
| 01623 292 | Protected | - | 4+6 | - | - |
| 01623 293 | Protected | - | 4+6 | - | - |
| 01623 294 | Protected | - | 4+6 | - | - |
| 01623 295 | Protected | - | 4+6 | - | - |
| 01623 296 | Protected | - | 4+6 | - | - |
| 01623 297 | Protected | - | 4+6 | - | - |
| 01623 298 | Protected | - | 4+6 | - | - |
| 01623 299 | Allocated | Resilient Networks Plc | 4+6 | - | 09/09/2011 |
| 01623 300 | Allocated | Net-Work Internet Ltd | 4+6 | - | 25/02/2008 |
| 01623 301 | Allocated | Telecom2 Ltd | 4+6 | - | 10/09/2009 |
| 01623 302 | Allocated | Timico Limited | 4+6 | - | 16/05/2008 |
| 01623 303 | Allocated | X-Pilot Limited | 4+6 | F-Digit '0' | 28/05/2008 |
| 01623 304 | Allocated | Nodemax Limited | 4+6 | - | 09/07/2008 |
| 01623 305 | Allocated | TalkTalk Communications Limited | 4+6 | - | 28/07/2008 |
| 01623 306 | Allocated | Voxbone SA | 4+6 | - | 23/09/2008 |
| 01623 307 | Allocated | 3C Limited | 4+6 | - | 01/10/2008 |
| 01623 308 | Allocated | Solutios Limited | 4+6 | - | 05/11/2008 |
| 01623 309 | Allocated | Served Up Limited. | 4+6 | - | 23/10/2008 |
| 01623 310 | Allocated | Starcomm Ltd | 4+6 | - | 03/10/2008 |
| 01623 311 | Allocated | Mars Communications Limited | 4+6 | - | 05/02/2009 |
| 01623 312 | Allocated | Barritec Limited | 4+6 | - | 12/11/2008 |
| 01623 313 | Allocated | IPV6 Limited | 4+6 | - | 06/02/2009 |
| 01623 314 | Allocated | Telecoms World Plc | 4+6 | - | 28/04/2009 |
| 01623 315 | Allocated | Andrews & Arnold (Numbers) Ltd | 4+6 | - | 25/03/2009 |
| 01623 316 | Allocated | Mundio Mobile Limited | 4+6 | - | 07/07/2009 |
| 01623 317 | Allocated | CFL Communications Limited | 4+6 | - | 14/07/2009 |
| 01623 318 | Allocated | Known Communications Limited | 4+6 | - | 22/09/2009 |
| 01623 319 | Allocated | Nexus Telecommunications Limited | 4+6 | - | 28/09/2009 |
| 01623 320 | Allocated | Business Broadcast Communications Ltd | 4+6 | - | 16/10/2009 |
| 01623 321 | Allocated | Invomo Ltd | 4+6 | - | 08/12/2009 |
| 01623 322 | Allocated | Orbis Telecom | 4+6 | - | 29/01/2010 |
| 01623 323 | Allocated | i-Net Communications Group Plc | 4+6 | - | 15/01/2010 |
| 01623 324 | Allocated | Wightfibre Limited | 4+6 | - | 11/02/2010 |
| 01623 325 | Allocated | Buzz Networks Limited | 4+6 | - | 24/02/2010 |
| 01623 326 | Allocated | Atomstream Limited | 4+6 | - | 24/03/2010 |
| 01623 327 | Allocated | Digitech Solutions Global Limited | 4+6 | - | 27/04/2010 |
| 01623 328 | Allocated | Verizon UK Ltd | 4+6 | - | 30/04/2010 |
| 01623 329 | Allocated | Suretec Systems Ltd | 4+6 | - | 06/05/2010 |
| 01623 330 | Allocated | Calltracks Limited | 4+6 | - | 08/07/2010 |
| 01623 331 | Allocated | Core Telecom Limited | 4+6 | - | 06/08/2010 |
| 01623 332 | Allocated | Numbergroup Network Ltd | 4+6 | - | 16/09/2010 |
| 01623 333 | Allocated | Telappliant Ltd | 4+6 | - | 21/06/2010 |
| 01623 334 | Allocated | Windsor Telecom Plc | 4+6 | - | 29/07/2010 |
| 01623 335 | Allocated | Citrus Telecommunications Ltd | 4+6 | - | 04/11/2010 |
| 01623 336 | Allocated | Telephone Box Limited | 4+6 | - | 14/12/2010 |
| 01623 337 | Allocated | Cheers International Sales Limited | 4+6 | - | 17/12/2010 |
| 01623 338 | Allocated | Phone Co-Op Numbering Limited | 4+6 | - | 23/12/2010 |
| 01623 339 | Allocated | IP Base Ltd | 4+6 | - | 21/01/2011 |
| 01623 340 | Allocated | Nexbridge Communications Limited | 4+6 | - | 17/03/2011 |
| 01623 341 | Allocated | Numbers Plus Ltd | 4+6 | - | 28/07/2011 |
| 01623 342 | Allocated | Barritec Limited | 4+6 | - | 28/09/2011 |
| 01623 343 | Allocated | Orbtalk Limited | 4+6 | - | 16/09/2011 |
| 01623 344 | Allocated | Tesla Dynamic Ltd | 4+6 | - | 07/07/2011 |
| 01623 345 | Allocated | iNet Telecoms Ltd (Voipfone) | 4+6 | - | 17/10/2011 |
| 01623 346 | Allocated | Minotaur Telecom Limited | 4+6 | - | 27/10/2011 |
| 01623 347 | Allocated | Invoco Ltd | 4+6 | - | 02/11/2011 |
| 01623 348 | Allocated | Hello Telecom (UK) PLC | 4+6 | - | 17/11/2011 |
| 01623 349 | Allocated | Internexus Networks Limited | 4+6 | - | 21/11/2011 |
| 01623 350 | Allocated | Bicom Systems EURL | 4+6 | - | 01/03/2012 |
| 01623 351 | Allocated | API Telecom Limited | 4+6 | - | 05/04/2012 |
| 01623 352 | Allocated | ICC Networks Ltd | 4+6 | - | 17/04/2012 |
| 01623 353 | Allocated | Broadcast Telecom Ltd | 4+6 | - | 29/02/2012 |
| 01623 354 | Allocated | Simwood eSMS Limited | 4+6 | - | 26/04/2012 |
| 01623 355 | Allocated | IOVOX Limited | 4+6 | - | 03/07/2012 |
| 01623 356 | Allocated | Ziron (UK) Ltd | 4+6 | - | 30/07/2012 |
| 01623 357 | Allocated | We Love Communications Limited | 4+6 | - | 13/08/2012 |
| 01623 358 | Allocated | Content Guru Ltd | 4+6 | - | 12/10/2012 |
| 01623 359 | Allocated | Media Hawk Ltd | 4+6 | - | 10/04/2013 |
| 01623 360 | Allocated | British Sky Broadcasting Limited | 4+6 | F-Digits '0' | 26/04/2013 |
| 01623 361 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 20/06/2013 |
| 01623 362 | Allocated | Kalnet4u Ltd | 4+6 | - | 24/05/2013 |
| 01623 363 | Allocated | iHub UK Ltd | 4+6 | - | 16/08/2013 |
| 01623 364 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 21/08/2013 |
| 01623 365 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 21/08/2013 |
| 01623 366 | Allocated | Magnetic North Software Limited | 4+6 | - | 15/01/2013 |
| 01623 367 | Allocated | British Sky Broadcasting Limited | 4+6 | - | 21/08/2013 |
| 01623 368 | Allocated | TalkTalk Communications Limited | 4+6 | - | 19/02/2013 |
| 01623 369 | Allocated | XoverX Ltd | 4+6 | - | 30/04/2013 |
| 01623 370 | Allocated | TalkTalk Communications Limited | 4+6 | - | 26/03/2014 |
| 01623 371 | Free | - | 4+6 | - | - |
| 01623 372 | Free | - | 4+6 | - | - |
| 01623 373 | Free | - | 4+6 | - | - |
| 01623 374 | Free | - | 4+6 | - | - |
| 01623 375 | Free | - | 4+6 | - | - |
| 01623 376 | Free | - | 4+6 | - | - |
| 01623 377 | Allocated | Radius Communications Limited | 4+6 | - | 07/01/2014 |
| 01623 378 | Free | - | 4+6 | - | - |
| 01623 379 | Free | - | 4+6 | - | - |
| 01623 380 | Protected | - | 4+6 | - | - |
| 01623 381 | Protected | - | 4+6 | - | - |
| 01623 382 | Protected | - | 4+6 | - | - |
| 01623 383 | Protected | - | 4+6 | - | - |
| 01623 384 | Protected | - | 4+6 | - | - |
| 01623 385 | Protected | - | 4+6 | - | - |
| 01623 386 | Protected | - | 4+6 | - | - |
| 01623 387 | Protected | - | 4+6 | - | - |
| 01623 388 | Protected | - | 4+6 | - | - |
| 01623 389 | Protected | - | 4+6 | - | - |
| 01623 390 | Protected | - | 4+6 | - | - |
| 01623 391 | Protected | - | 4+6 | - | - |
| 01623 392 | Protected | - | 4+6 | - | - |
| 01623 393 | Protected | - | 4+6 | - | - |
| 01623 394 | Protected | - | 4+6 | - | - |
| 01623 395 | Protected | - | 4+6 | - | - |
| 01623 396 | Protected | - | 4+6 | - | - |
| 01623 397 | Protected | - | 4+6 | - | - |
| 01623 398 | Protected | - | 4+6 | - | - |
| 01623 399 | Protected | - | 4+6 | - | - |
| 01623 40 | Allocated | Virgin Media Limited | 4+6 | - | 15/12/1997 |
| 01623 41 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 42 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 43 | Allocated | Virgin Media Limited | 4+6 | - | 23/07/1999 |
| 01623 44 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 45 | Allocated | Virgin Media Limited | 4+6 | - | 15/07/1994 |
| 01623 46 | Allocated | Virgin Media Limited | 4+6 | - | 25/09/1996 |
| 01623 47 | Allocated | Virgin Media Limited | 4+6 | - | 15/05/1997 |
| 01623 48 | Allocated | Virgin Media Limited | 4+6 | - | 15/05/1997 |
| 01623 49 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 50 | Allocated | InTechnology Plc | 4+6 | - | 02/07/2007 |
| 01623 51 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 52 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 53 | Allocated | Vodafone Ltd (Thus) | 4+6 | - | 29/11/2001 |
| 01623 540 | Protected | - | 4+6 | - | - |
| 01623 541 | Allocated | Affiniti Integrated Solutions Ltd | 4+6 | - | 05/05/2000 |
| 01623 542 | Allocated | Affiniti Integrated Solutions Ltd | 4+6 | - | 05/05/2000 |
| 01623 543 | Allocated | Affiniti Integrated Solutions Ltd | 4+6 | - | 05/05/2000 |
| 01623 544 | Allocated | Affiniti Integrated Solutions Ltd | 4+6 | - | 05/05/2000 |
| 01623 545 | Allocated | Affiniti Integrated Solutions Ltd | 4+6 | - | 05/05/2000 |
| 01623 546 | Protected | - | 4+6 | - | - |
| 01623 547 | Protected | - | 4+6 | - | - |
| 01623 548 | Protected | - | 4+6 | - | - |
| 01623 549 | Allocated | Affiniti Integrated Solutions Ltd | 4+6 | - | 05/05/2000 |
| 01623 55 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 560 | Protected | - | 4+6 | - | - |
| 01623 561 | Protected | - | 4+6 | - | - |
| 01623 562 | Protected | - | 4+6 | - | - |
| 01623 563 | Protected | - | 4+6 | - | - |
| 01623 564 | Protected | - | 4+6 | - | - |
| 01623 565 | Protected | - | 4+6 | - | - |
| 01623 566 | Protected | - | 4+6 | - | - |
| 01623 567 | Protected | - | 4+6 | - | - |
| 01623 568 | Allocated | Vodafone Ltd (YC) | 4+6 | - | 30/08/2011 |
| 01623 569 | Protected | - | 4+6 | - | - |
| 01623 570 | Allocated | Linear Telecoms Limited | 4+6 | - | 14/10/2010 |
| 01623 571 | Protected | - | 4+6 | - | - |
| 01623 572 | Protected | - | 4+6 | - | - |
| 01623 573 | Protected | - | 4+6 | - | - |
| 01623 574 | Protected | - | 4+6 | - | - |
| 01623 575 | Protected | - | 4+6 | - | - |
| 01623 576 | Protected | - | 4+6 | - | - |
| 01623 577 | Protected | - | 4+6 | - | - |
| 01623 578 | Protected | - | 4+6 | - | - |
| 01623 579 | Protected | - | 4+6 | - | - |
| 01623 58 | Allocated | BT | 4+6 | - | 17/08/1995 |
| 01623 59 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 15/02/2010 |
| 01623 60 | Allocated | Virgin Media Limited | 4+6 | - | 09/01/2001 |
| 01623 61 | Allocated | British Sky Broadcasting Limited | 4+6 | F-Digits '0,1,2,3,4,5,6,7,8' | 16/05/2006 |
| 01623 62 | Allocated | BT | 4+6 | - | 23/01/1998 |
| 01623 63 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 64 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 65 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 66 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 67 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 68 | Allocated | BT | 4+6 | - | 13/06/1997 |
| 01623 69 | Allocated | Danemere Street Creative | 4+6 | - | 14/06/2005 |
| 01623 700 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 701 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 702 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 703 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 704 | Protected | - | 4+6 | - | - |
| 01623 705 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 706 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 707 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 708 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 709 | Allocated | Gamma Telecom Holdings Ltd | 4+6 | - | 24/12/2004 |
| 01623 710 | Allocated | Inclarity Communications Ltd | 4+6 | - | 12/05/2005 |
| 01623 711 | Allocated | Inclarity Communications Ltd | 4+6 | - | 12/05/2005 |
| 01623 712 | Allocated | Inclarity Communications Ltd | 4+6 | - | 12/05/2005 |
| 01623 713 | Protected | - | 4+6 | - | - |
| 01623 714 | Protected | - | 4+6 | - | - |
| 01623 715 | Allocated | Inclarity Communications Ltd | 4+6 | - | 12/05/2005 |
| 01623 716 | Protected | - | 4+6 | - | - |
| 01623 717 | Protected | - | 4+6 | - | - |
| 01623 718 | Protected | - | 4+6 | - | - |
| 01623 719 | Protected | - | 4+6 | - | - |
| 01623 72 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 73 | Allocated | Edge Telecom Limited | 4+6 | - | 22/02/2005 |
| 01623 74 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 75 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 760 | Protected | - | 4+6 | - | - |
| 01623 761 | Protected | - | 4+6 | - | - |
| 01623 762 | Protected | - | 4+6 | - | - |
| 01623 763 | Protected | - | 4+6 | - | - |
| 01623 764 | Protected | - | 4+6 | - | - |
| 01623 765 | Protected | - | 4+6 | - | - |
| 01623 766 | Protected | - | 4+6 | - | - |
| 01623 767 | Protected | - | 4+6 | - | - |
| 01623 768 | Protected | - | 4+6 | - | - |
| 01623 769 | Protected | - | 4+6 | - | - |
| 01623 77 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 22/02/2010 |
| 01623 78 | Allocated | Vodafone Ltd (C&W) | 4+6 | - | 15/02/2010 |
| 01623 79 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 800 | Protected | - | 4+6 | - | - |
| 01623 801 | Protected | - | 4+6 | - | - |
| 01623 802 | Protected | - | 4+6 | - | - |
| 01623 803 | Protected | - | 4+6 | - | - |
| 01623 804 | Protected | - | 4+6 | - | - |
| 01623 805 | Protected | - | 4+6 | - | - |
| 01623 806 | Protected | - | 4+6 | - | - |
| 01623 807 | Protected | - | 4+6 | - | - |
| 01623 808 | Protected | - | 4+6 | - | - |
| 01623 809 | Protected | - | 4+6 | - | - |
| 01623 81 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 82 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 83 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 84 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 850 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 17/11/2011 |
| 01623 851 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 17/11/2011 |
| 01623 852 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 17/11/2011 |
| 01623 853 | Protected | - | 4+6 | - | - |
| 01623 854 | Protected | - | 4+6 | - | - |
| 01623 855 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 17/11/2011 |
| 01623 856 | Protected | - | 4+6 | - | - |
| 01623 857 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 17/11/2011 |
| 01623 858 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 17/11/2011 |
| 01623 859 | Allocated | Magrathea Telecommunications Limited | 4+6 | - | 17/11/2011 |
| 01623 86 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 87 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 88 | Allocated | BT | 4+6 | - | 15/07/1994 |
| 01623 890 | Protected | - | 4+6 | - | - |
| 01623 891 | Protected | - | 4+6 | - | - |
| 01623 892 | Protected | - | 4+6 | - | - |
| 01623 893 | Protected | - | 4+6 | - | - |
| 01623 894 | Protected | - | 4+6 | - | - |
| 01623 895 | Protected | - | 4+6 | - | - |
| 01623 896 | Protected | - | 4+6 | - | - |
| 01623 897 | Protected | - | 4+6 | - | - |
| 01623 898 | Protected | - | 4+6 | - | - |
| 01623 899 | Protected | - | 4+6 | - | - |
| 01623 900 | Allocated | Six Degrees Unified Comms Limited | 4+6 | - | 13/10/2005 |
| 01623 901 | Protected | - | 4+6 | - | - |
| 01623 902 | Protected | - | 4+6 | - | - |
| 01623 903 | Protected | - | 4+6 | - | - |
| 01623 904 | Allocated | Six Degrees Unified Comms Limited | 4+6 | - | 13/10/2005 |
| 01623 905 | Protected | - | 4+6 | - | - |
| 01623 906 | Protected | - | 4+6 | - | - |
| 01623 907 | Protected | - | 4+6 | - | - |
| 01623 908 | Protected | - | 4+6 | - | - |
| 01623 909 | Protected | - | 4+6 | - | - |
| 01623 91 | Allocated | TG Support Limited | 4+6 | - | 05/07/2006 |
| 01623 920 | Allocated | Digitech Solutions Global Limited | 4+6 | - | 08/09/2010 |
| 01623 921 | Protected | - | 4+6 | - | - |
| 01623 922 | Protected | - | 4+6 | - | - |
| 01623 923 | Protected | - | 4+6 | - | - |
| 01623 924 | Protected | - | 4+6 | - | - |
| 01623 925 | Protected | - | 4+6 | - | - |
| 01623 926 | Protected | - | 4+6 | - | - |
| 01623 927 | Protected | - | 4+6 | - | - |
| 01623 928 | Protected | - | 4+6 | - | - |
| 01623 929 | Protected | - | 4+6 | - | - |
| 01623 93 | Allocated | FleXtel Limited | 4+6 | - | 21/10/2005 |
| 01623 94 | Allocated | Easynet Enterprise Services Limited | 4+6 | F-Digit '9' | 14/02/2006 |
| 01623 950 | Protected | - | 4+6 | - | - |
| 01623 951 | Protected | - | 4+6 | - | - |
| 01623 952 | Protected | - | 4+6 | - | - |
| 01623 953 | Protected | - | 4+6 | - | - |
| 01623 954 | Protected | - | 4+6 | - | - |
| 01623 955 | Protected | - | 4+6 | - | - |
| 01623 956 | Protected | - | 4+6 | - | - |
| 01623 957 | Protected | - | 4+6 | - | - |
| 01623 958 | Protected | - | 4+6 | - | - |
| 01623 959 | Protected | - | 4+6 | - | - |
| 01623 96 | Allocated | Syntec Limited | 4+6 | - | 15/11/2005 |
| 01623 97 | Allocated | Net Solutions Europe Limited | 4+6 | F-Digit '7' | 28/02/2006 |
| 01623 980 | Allocated | VoiceHost Limited | 4+6 | - | 20/08/2010 |
| 01623 981 | Protected | - | 4+6 | - | - |
| 01623 982 | Protected | - | 4+6 | - | - |
| 01623 983 | Protected | - | 4+6 | - | - |
| 01623 984 | Protected | - | 4+6 | - | - |
| 01623 985 | Protected | - | 4+6 | - | - |
| 01623 986 | Protected | - | 4+6 | - | - |
| 01623 987 | Protected | - | 4+6 | - | - |
| 01623 988 | Protected | - | 4+6 | - | - |
| 01623 989 | Protected | - | 4+6 | - | - |
| 01623 99 | Protected | - | N/A | - | - |