| GB | AS39730 | Eircom (UK) Ltd |
| GB | AS21470 | South West Communications Group |
| GB | AS47534 | VOCALINK LTD |
| GB | AS56929 | WANDSWORTH-BOROUGH-COUNCIL |
| GB | AS209761 | NECS |
| GB | AS39382 | Optinium Ltd |
| GB | AS47622 | Datatech UK Ltd |
| GB | AS205654 | Labtech Systems Ltd |
| US | AS16491 | ViaSat, Inc. |
| US | AS19239 | KLA Corporation |
| DE | AS211820 | Evotec SE |
| FR | AS211124 | CGI-UK-AS |
| GB | AS8669 | Total Web Solutions Ltd |
| GB | AS207900 | Northrop Grumman UK Limited |
| GB | AS62364 | Plymouth City Council |
| GB | AS207173 | Northrop Grumman UK Limited |
| GB | AS202907 | ATOMICIT |
| GB | AS41570 | BFBS |
| GB | AS206773 | MSX International Ltd |
| US | AS32906 | FACTORY MUTUAL INSURANCE COMPANY |
| NL | AS209258 | TSYS Europe (Netherlands) B.V. |
| GB | AS197104 | Gentoo Group Limited |
| US | AS14931 | The St. Paul Travelers Companies, Inc. |
| GB | AS41548 | Medway Council |
| GB | AS50078 | X-ON |
| EU | AS1290 | Telstra International (PSINet UK) |
| GB | AS204322 | New York Times Limited |
| GB | AS206576 | Wavenet Limited - AS206576 |
| GB | AS8336 | THE INNOVATION GROUP (EMEA) LTD |
| GB | AS9011 | The Patent Office |
| GB | AS213885 | Wilxite Ltd |
| GB | AS201358 | FNZ (UK) Ltd |
| GB | AS8296 | HBVB Private Unlimited |
| GB | AS34099 | Road Tech Computer Systems Ltd. |
| RU | AS203749 | O2 Cloud, LLC |
| GB | AS50203 | Reynolds and Reynolds Limited |
| US | AS397010 | Dice Lion Technology |
| GB | AS39400 | London Borough of Hackney |
| GB | AS60914 | Telecoms Consortium Ltd. |
| GB | AS15914 | British Airways plc |
| NL | AS60142 | NXP Semiconductors Netherlands B.V. |
| GB | AS49318 | TELEFONICA TECH UK MANAGED SERVICES LTD |
| GB | AS44008 | Royal Borough of Kensington and Chelsea |
| CA | AS49707 | TESSAWORKS |
| US | AS22001 | Life Technologies Corp. |
| GB | AS51905 | Compuweb Communications Services Limited |
| US | AS16525 | KBR |
| GB | AS60187 | London Grid for Learning Trust |
| GB | AS25546 | Brookland Computer Services Limited |
| GB | AS205693 | Driver & Vehicle Licensing Agency |
