| 1 | AS39122 | Blacknight Internet Solutions | 19 | 1 | 23 | 5 |
| 2 | AS31122 | Viatel Ireland | 16 | 3 | 45 | 6 |
| 3 | AS207044 | Enet Telecommunications Networks Limited | 11 | 2 | 26 | 16 |
| 4 | AS5466 | eircom | 11 | 2 | 25 | 3 |
| 5 | AS47720 | Cork Internet Exchange | 10 | 2 | 13 | 3 |
| 6 | AS2110 | Enet Communications | 9 | 1 | 16 | 1 |
| 7 | AS210464 | AVSISP | 7 | 2 | 7 | 28 |
| 8 | AS44786 | Adobe Systems Software Ireland Ltd | 6 | 6 | 36 | 0 |
| 9 | AS56410 | HOST-IRELAND-AS | 6 | 3 | 22 | 1 |
| 10 | AS214999 | Christian Wolfseher | 6 | 0 | 0 | 8 |
| 11 | AS15502 | Vodafone Ireland | 5 | 1 | 45 | 0 |
| 12 | AS34245 | Magnet Networks | 5 | 2 | 17 | 2 |
| 13 | AS62129 | Wireless Connect Ltd. | 5 | 1 | 4 | 0 |
| 14 | AS13280 | Three Ireland (Hutchison) Ltd | 4 | 3 | 69 | 0 |
| 15 | AS1213 | Asiera | 4 | 1 | 17 | 1 |
| 16 | AS42227 | Airwire | 4 | 2 | 17 | 1 |
| 17 | AS51677 | Logfont Ltd | 4 | 4 | 13 | 0 |
| 18 | AS198510 | XTDEF-Limited | 4 | 3 | 7 | 8 |
| 19 | AS35289 | NortonLifeLock Ireland Limited | 4 | 4 | 5 | 0 |
| 20 | AS43192 | Ajisko Ltd t/a Integrated Media Solutions | 4 | 1 | 3 | 0 |
| 21 | AS211535 | asilkari | 4 | 2 | 3 | 2 |
| 22 | AS30900 | Web World Ireland | 3 | 2 | 34 | 2 |
| 23 | AS24675 | Irish Government | 3 | 3 | 20 | 0 |
| 24 | AS25441 | Imagine Communications Group Ltd | 3 | 2 | 9 | 1 |
| 25 | AS30864 | ELAVON FINANCIAL SERVICES LIMITED | 3 | 2 | 9 | 0 |
| 26 | AS16171 | STRENCOM | 3 | 2 | 8 | 1 |
| 27 | AS29644 | Airspeed Telecom | 3 | 1 | 7 | 3 |
| 28 | AS48305 | Noraina | 3 | 2 | 7 | 5 |
| 29 | AS209285 | Electricity Supply Board | 3 | 3 | 7 | 0 |
| 30 | AS42310 | IE Domain Registry Limited | 3 | 3 | 6 | 3 |
| 31 | AS206663 | MTS Media | 3 | 1 | 4 | 0 |
| 32 | AS34912 | Interfusion Networks | 3 | 1 | 3 | 0 |
| 33 | AS200186 | Seith It Consulting Limited | 3 | 3 | 3 | 0 |
| 34 | AS15612 | ServeCentric (Blanchardstown) | 3 | 2 | 2 | 0 |
| 35 | AS8011 | MongoDB, Inc. | 2 | 2 | 47 | 0 |
| 36 | AS51173 | PBB | 2 | 2 | 13 | 0 |
| 37 | AS43949 | Marsh Ireland Brokers Limited | 2 | 2 | 11 | 0 |
| 38 | AS12372 | Cubic Telecom Limited | 2 | 2 | 9 | 10 |
| 39 | AS29650 | Sungard Availability Services (Ireland) Ltd. | 2 | 2 | 9 | 1 |
| 40 | AS198301 | WKD-AS | 2 | 2 | 9 | 0 |
| 41 | AS216414 | Upmc Global Operations Center Limited | 2 | 2 | 7 | 0 |
| 42 | AS21130 | EASYSPACE LIMITED | 2 | 2 | 6 | 1 |
| 43 | AS60277 | Telcom Limited | 2 | 2 | 6 | 1 |
| 44 | AS50326 | INTERNET PROTOCOL TELECOM LTD | 2 | 2 | 5 | 0 |
| 45 | AS201310 | Interlink Ireland Ltd | 2 | 2 | 5 | 0 |
| 46 | AS8918 | Coolwave Communications Limited | 2 | 2 | 4 | 0 |
| 47 | AS15806 | Irish Government | 2 | 1 | 4 | 1 |
| 48 | AS39093 | Westnet.ie | 2 | 1 | 4 | 2 |
| 49 | AS206746 | SCCBROADBAND-AS | 2 | 2 | 4 | 4 |
| 50 | AS2128 | INEX Route Collectors | 2 | 2 | 3 | 2 |
| 51 | AS199326 | Voice Engineer Ireland Limited | 2 | 2 | 3 | 3 |
| 52 | AS203262 | Innovate Business Technology Ltd | 2 | 2 | 3 | 0 |
| 53 | AS215429 | Iqvia Solutions Hq Ltd | 2 | 2 | 3 | 0 |
| 54 | AS1197 | Nicholas William Hilliard | 2 | 1 | 2 | 1 |
| 55 | AS39485 | Northwest Broadband Connect | 2 | 1 | 2 | 1 |
| 56 | AS40490 | AFILIAS-CTRL2 | 2 | 2 | 2 | 1 |
| 57 | AS47443 | Velocity1 | 2 | 2 | 2 | 1 |
| 58 | AS199559 | Polarlake | 2 | 2 | 2 | 0 |
| 59 | AS199873 | Ezetop Unlimited Company ULC | 2 | 2 | 2 | 0 |
| 60 | AS202823 | Office IT Ltd. | 2 | 2 | 2 | 0 |
| 61 | AS205743 | Munster Wireless Ltd. | 2 | 2 | 2 | 0 |
| 62 | AS206998 | New Relic (AS206998) | 2 | 2 | 2 | 1 |
| 63 | AS212312 | Exigent Network Integration Ltd | 2 | 2 | 2 | 1 |
| 64 | AS47680 | BBnet | 2 | 1 | 1 | 0 |
| 65 | AS60110 | Model Telecom Ltd | 2 | 1 | 1 | 0 |
| 66 | AS204536 | TSFY | 2 | 2 | 1 | 0 |
| 67 | AS206577 | ZARIOT | 2 | 1 | 1 | 0 |
| 68 | AS211638 | Dragon Networks | 2 | 1 | 1 | 1 |
| 69 | AS214973 | Apex Strata Ltd | 2 | 0 | 1 | 3 |
| 70 | AS211024 | devplayer0 | 2 | 0 | 0 | 3 |
| 71 | AS213368 | Marco Ciotola | 2 | 0 | 0 | 5 |
| 72 | AS34010 | Yahoo! UK Services Limited | 1 | 1 | 45 | 7 |
| 73 | AS201000 | JS Whizzy Internet | 1 | 1 | 32 | 6 |
| 74 | AS15751 | Meteor Mobile Communications Limited | 1 | 1 | 7 | 1 |
| 75 | AS43599 | North West Electronics | 1 | 1 | 7 | 0 |
| 76 | AS44212 | Adelphi Net1 Limited | 1 | 1 | 7 | 4 |
| 77 | AS49567 | Aptus | 1 | 1 | 7 | 1 |
| 78 | AS51046 | Bringo Limited | 1 | 1 | 7 | 1 |
| 79 | AS201111 | Planet Payment Group Holdings Limited | 1 | 1 | 7 | 0 |
| 80 | AS215733 | Blacknight Internet Solutions Limited | 1 | 1 | 7 | 2 |
| 81 | AS394562 | Stripe, Inc. | 1 | 1 | 7 | 0 |
| 82 | AS42090 | Rapid Broadband Ltd | 1 | 1 | 6 | 0 |
| 83 | AS43406 | Lightnet | 1 | 1 | 6 | 1 |
| 84 | AS209924 | MLB Limited | 1 | 1 | 6 | 0 |
| 85 | AS15405 | East Cork Broadband | 1 | 1 | 5 | 1 |
| 86 | AS200807 | Sleepless.ie | 1 | 1 | 5 | 0 |
| 87 | AS207382 | Realize LLC | 1 | 1 | 5 | 0 |
| 88 | AS34815 | Dublin Enterprise & Technology Centre Limited | 1 | 1 | 4 | 0 |
| 89 | AS39449 | Fastcom Broadband Ltd | 1 | 1 | 4 | 0 |
| 90 | AS42326 | HERTZ EUROPE SERVICE CENTRE LIMITED | 1 | 1 | 4 | 0 |
| 91 | AS44196 | Modeva Interactive | 1 | 1 | 4 | 0 |
| 92 | AS47446 | BCG-AS | 1 | 1 | 4 | 0 |
| 93 | AS48970 | Natus Manufacturing Limited | 1 | 1 | 4 | 0 |
| 94 | AS60499 | Opt1mize Technologies Limited | 1 | 1 | 4 | 0 |
| 95 | AS196737 | Airwave Internet | 1 | 1 | 4 | 0 |
| 96 | AS200565 | Ivertec Ltd | 1 | 1 | 4 | 1 |
| 97 | AS206723 | Carnsore Broadband Limited | 1 | 1 | 4 | 1 |
| 98 | AS209975 | INCA Networks | 1 | 1 | 4 | 0 |
| 99 | AS12287 | Afilias Ltd | 1 | 1 | 3 | 1 |
| 100 | AS57791 | Eurona-Brisknet Ltd | 1 | 1 | 3 | 0 |
Autonome Systeme in Irland