This is a list of the "Top 50" players who if CIDRizing at the AS level could make a significant gain in the reduction of the size of Internet routing tables. This may be an over-estimation but it is hoped that this can act as an incentive for the "Top 50" and others to look at their CIDR capability. This is a revival of report that used to be posted in the early days of CIDR deployment (we even had a cidrd list and working group then). This looks purely at the classful routes in the system and shows what gain if cidrizing at the AS-level could be made by forming an aggregate. --Tony P.S. Same caveat about AS name mappings not working quite right yet. P.P.S. Unless there are loud objections I plan to automate this again soon. ASnum NetsNow NetsCIDR NetGain % Gain Description AS560 1697 877 820 48.3% BBN Planet, New England Region (N AS174 1295 938 357 27.6% Performance Systems International AS2493 728 456 272 37.4% FONOROLA-EAST AS3602 546 313 233 42.7% Intergrated Network Services Inc. AS1 462 293 169 36.6% BBN Planet backbone AS3397 255 94 161 63.1% EMI-AS AS3804 384 241 143 37.2% WorldLinx 3 AS1691 294 156 138 46.9% UNKNOWN AS86 293 183 110 37.5% SURAnet Northern AS AS568 375 265 110 29.3% JIS (Joint Interconnection Servic AS2386 235 140 95 40.4% INS-AS AS2704 271 182 89 32.8% HOOKUP-NET-A AS1717 451 362 89 19.7% RENATER AS721 348 267 81 23.3% UNKNOWN AS2900 207 126 81 39.1% Westnet Arizona (ASU) AS3215 127 53 74 58.3% RAIN AS3301 344 277 67 19.5% TeliaNet Sweden AS813 215 151 64 29.8% UUNET Canada (ASN-UUNETCA-AS1) AS701 868 809 59 6.8% Alternet AS2711 108 49 59 54.6% SUNBELT-AS AS1790 261 205 56 21.5% SprintLink Washington D.C. AS839 90 35 55 61.1% North West Territories Regional N AS3819 78 23 55 70.5% SIGNET AS855 119 66 53 44.5% NBTel AS225 109 67 42 38.5% University of Virginia (VIRnet) AS549 204 163 41 20.1% ONet Backbone AS3824 63 23 40 63.5% UNKNOWN AS3132 72 32 40 55.6% Red Cientifica Peruana (ASN-RCP) AS3566 64 25 39 60.9% UNKNOWN AS4983 62 25 37 59.7% Intel Corporation Autonomous Syst AS1785 220 183 37 16.8% NYSERNet Backbone AS6059 53 17 36 67.9% UNKNOWN AS3561 848 812 36 4.2% MCI AS97 135 101 34 25.2% JvNCnet AS852 129 95 34 26.4% AGT Advance Communication AS2044 112 78 34 30.4% WORLDNET-AS AS719 392 359 33 8.4% LANLINK autonomous system AS600 199 166 33 16.6% OARnet AS AS4175 411 378 33 8.0% UNKNOWN AS279 210 177 33 15.7% SURAnet Southern AS AS271 90 57 33 36.7% BCnet Backbone AS4200 155 123 32 20.6% AGIS (Apex Global Information Ser AS1706 66 34 32 48.5% University of Arizona AS3799 53 23 30 56.6% IDS AS3603 63 33 30 47.6% CETCOL - Uniandes AS3354 118 88 30 25.4% THENET-AS-1 AS1791 109 80 29 26.6% SprintLink Fort Worth TX AS4361 42 14 28 66.7% UNKNOWN AS4230 76 48 28 36.8% Embratel Brazil AS262 100 72 28 28.0% UNKNOWN AS2551 321 293 28 8.7% NETCOM On-line Communication Serv