The Cidr Report

This report has been generated at Fri Mar 21 21:46:30 2003 AEST.
The report analyses the BGP Routing Table of an AS4637 (Reach) router
and generates a report on aggregation potential within the table.

Check http://www.cidr-report.org/as4637 for a current version of this report.

Recent Table History
        Date Prefixes CIDR Agg
        14-03-03 120659 86373
        15-03-03 120724 85975
        16-03-03 120525 85886
        17-03-03 120567 85987
        18-03-03 120637 86171
        19-03-03 120704 86222
        20-03-03 120817 86331
        21-03-03 120815 86377

AS Summary
         14780 Number of ASes in routing system
          5842 Number of ASes announcing only one prefix
          1555 Largest number of prefixes announced by an AS
                AS701 : ALTERNET-AS UUNET Technologies, Inc.
      73048064 Largest address span announced by an AS (/32s)
                AS568 : SUMNET-AS DISO-UNRRA

Aggregation Summary
The algorithm used in this report proposes aggregation only
when there is a precise match using the AS path, so as
to preserve traffic transit policies. Aggregation is also
proposed across non-advertised address space ('holes').

--- 21Mar03 ---
ASnum NetsNow NetsAggr NetGain % Gain Description

Table 120844 86356 34488 28.5% All ASes

AS3908 1097 536 561 51.1% SUPERNETASBLK SuperNet, Inc.
AS18566 505 13 492 97.4% COVAD Covad Communications
AS4151 545 108 437 80.2% USDA-1 USDA
AS701 1555 1126 429 27.6% ALTERNET-AS UUNET
                                               Technologies, Inc.
AS7843 614 214 400 65.1% ADELPHIA-AS Adelphia Corp.
AS4323 555 173 382 68.8% TW-COMM Time Warner
                                               Communications, Inc.
AS7018 1353 982 371 27.4% ATT-INTERNET4 AT&T WorldNet
                                               Services
AS1221 1104 808 296 26.8% ASN-TELSTRA Telstra Pty Ltd
AS22927 295 14 281 95.3% AR-TEAR2-LACNIC TELEFONICA DE
                                               ARGENTINA
AS1239 972 692 280 28.8% SPRINTLINK Sprint
AS1 705 430 275 39.0% GNTY-1 Genuity
AS6197 475 202 273 57.5% BATI-ATL BellSouth Network
                                               Solutions, Inc
AS4355 385 119 266 69.1% ERMS-EARTHLNK EARTHLINK, INC
AS6198 448 183 265 59.2% BATI-MIA BellSouth Network
                                               Solutions, Inc
AS705 457 203 254 55.6% ASN-ALTERNET UUNET
                                               Technologies, Inc.
AS4814 264 15 249 94.3% CHINANET-BEIJING-AP China
                                               Telecom (Group)
AS2386 496 275 221 44.6% INS-AS AT&T Data
                                               Communications Services
AS27364 278 69 209 75.2% ACS-INTERNET Armstrong Cable
                                               Services
AS17676 233 29 204 87.6% GIGAINFRA XTAGE CORPORATION
AS22291 243 48 195 80.2% CHARTER-LA Charter
                                               Communications
AS4134 310 119 191 61.6% CHINANET-BACKBONE
                                               No.31,Jin-rong Street
AS209 531 341 190 35.8% ASN-QWEST Qwest
AS690 504 314 190 37.7% MERIT-AS-27 Merit Network Inc.
AS6347 370 194 176 47.6% DIAMOND SAVVIS Communications
                                               Corporation
AS3561 517 342 175 33.8% CWUSA Cable & Wireless USA
AS2048 259 87 172 66.4% LANET-1 State of Louisiana
AS17557 374 211 163 43.6% PKTELECOM-AS-AP Pakistan
                                               Telecom
AS22773 191 32 159 83.2% CCINET-2 Cox Communications
                                               Inc. Atlanta
AS7303 242 89 153 63.2% AR-TAST-LACNIC Telecom
                                               Argentina Stet-France Telecom
                                               S.A.
AS8372 182 30 152 83.5% COLT-UK-AS COLT Internet UK
                                               Access Network.

Total 16059 7998 8061 50.2% Top 30 total

Please see http://www.cidr-report.org for the full report