The Cidr Report

Mailman List Mirror (Read Only)
1

This report has been generated at Fri Sep 9 21:12:28 2011 AEST.
The report analyses the BGP Routing Table of AS2.0 router
and generates a report on aggregation potential within the table.

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

Recent Table History
        Date Prefixes CIDR Agg
        02-09-11 373096 219901
        03-09-11 373636 219796
        04-09-11 373666 219877
        05-09-11 373566 219844
        06-09-11 373748 219894
        07-09-11 373965 219992
        08-09-11 373797 219481
        09-09-11 373405 220098

AS Summary
         38831 Number of ASes in routing system
         16392 Number of ASes announcing only one prefix
          3564 Largest number of prefixes announced by an AS
                AS6389 : BELLSOUTH-NET-BLK - BellSouth.net Inc.
      108360672 Largest address span announced by an AS (/32s)
                AS4134 : CHINANET-BACKBONE No.31,Jin-rong Street

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').

--- 09Sep11 ---
ASnum NetsNow NetsAggr NetGain % Gain Description

Table 374093 219958 154135 41.2% All ASes

AS6389 3564 229 3335 93.6% BELLSOUTH-NET-BLK -
                                               BellSouth.net Inc.
AS4766 2508 974 1534 61.2% KIXS-AS-KR Korea Telecom
AS18566 1912 378 1534 80.2% COVAD - Covad Communications
                                               Co.
AS22773 1451 108 1343 92.6% ASN-CXA-ALL-CCI-22773-RDC -
                                               Cox Communications Inc.
AS4755 1547 228 1319 85.3% TATACOMM-AS TATA
                                               Communications formerly VSNL
                                               is Leading ISP
AS4323 1627 397 1230 75.6% TWTC - tw telecom holdings,
                                               inc.
AS10620 1661 591 1070 64.4% Telmex Colombia S.A.
AS1785 1825 778 1047 57.4% AS-PAETEC-NET - PaeTec
                                               Communications, Inc.
AS19262 1394 400 994 71.3% VZGNI-TRANSIT - Verizon Online
                                               LLC
AS7552 1415 431 984 69.5% VIETEL-AS-AP Vietel
                                               Corporation
AS28573 1302 344 958 73.6% NET Servicos de Comunicao S.A.
AS18101 950 144 806 84.8% RELIANCE-COMMUNICATIONS-IN
                                               Reliance Communications
                                               Ltd.DAKC MUMBAI
AS24560 1177 386 791 67.2% AIRTELBROADBAND-AS-AP Bharti
                                               Airtel Ltd., Telemedia
                                               Services
AS8151 1411 659 752 53.3% Uninet S.A. de C.V.
AS4808 1077 339 738 68.5% CHINA169-BJ CNCGROUP IP
                                               network China169 Beijing
                                               Province Network
AS7303 1051 316 735 69.9% Telecom Argentina S.A.
AS7545 1581 860 721 45.6% TPG-INTERNET-AP TPG Internet
                                               Pty Ltd
AS3356 1103 449 654 59.3% LEVEL3 Level 3 Communications
AS30036 1327 692 635 47.9% MEDIACOM-ENTERPRISE-BUSINESS -
                                               Mediacom Communications Corp
AS3549 1080 449 631 58.4% GBLX Global Crossing Ltd.
AS14420 715 92 623 87.1% CORPORACION NACIONAL DE
                                               TELECOMUNICACIONES - CNT EP
AS20115 1591 971 620 39.0% CHARTER-NET-HKY-NC - Charter
                                               Communications
AS22561 973 365 608 62.5% DIGITAL-TELEPORT - Digital
                                               Teleport Inc.
AS17676 675 70 605 89.6% GIGAINFRA Softbank BB Corp.
AS17974 1985 1400 585 29.5% TELKOMNET-AS2-AP PT
                                               Telekomunikasi Indonesia
AS4804 660 87 573 86.8% MPX-AS Microplex PTY LTD
AS22047 579 31 548 94.6% VTR BANDA ANCHA S.A.
AS4780 759 230 529 69.7% SEEDNET Digital United Inc.
AS7011 1183 656 527 44.5% FRONTIER-AND-CITIZENS -
                                               Frontier Communications of
                                               America, Inc.
AS15475 512 8 504 98.4% NOL

Total 40595 13062 27533 67.8% Top 30 total

Possible Bogus Routes

        10.86.64.32/30 AS65530 -Private Use AS-
        10.86.64.36/30 AS65530 -Private Use AS-
        10.86.65.32/30 AS65530 -Private Use AS-
        10.86.65.36/30 AS65530 -Private Use AS-
        10.255.255.0/30 AS65530 -Private Use AS-
        10.255.255.4/30 AS65530 -Private Use AS-
        10.255.255.8/30 AS65530 -Private Use AS-
        41.222.79.0/24 AS36938 AMSCOTELECOMS Amsco Telecommunications Nigeria Limited
        41.223.92.0/22 AS36936 CELTEL-GABON Celtel Gabon Internet Service
        46.18.104.0/21 AS3.746
        62.61.220.0/24 AS24974 TACHYON-EU Tachyon Europe BV
        62.61.221.0/24 AS24974 TACHYON-EU Tachyon Europe BV
        64.21.192.0/20 AS11610 INETNEBR-1 - Internet Nebraska Corporation
        64.21.212.0/22 AS11610 INETNEBR-1 - Internet Nebraska Corporation
        64.21.216.0/21 AS11610 INETNEBR-1 - Internet Nebraska Corporation
        66.171.32.0/20 AS705 UUNET - MCI Communications Services, Inc. d/b/a Verizon Business
        66.180.239.0/24 AS35888 VIGNETTE - VIGNETTE CORPORATION
        66.206.47.0/24 AS17557 PKTELECOM-AS-PK Pakistan Telecommunication Company Limited
        66.207.32.0/20 AS23011
        66.245.176.0/20 AS19318 NJIIX-AS-1 - NEW JERSEY INTERNATIONAL INTERNET EXCHANGE LLC
        69.6.80.0/24 AS13442
        71.19.134.0/23 AS3313 INET-AS BT Italia S.p.A.
        76.77.32.0/19 AS2828 XO-AS15 - XO Communications
        80.88.10.0/24 AS33774 DJAWEB
        100.100.100.0/24 AS3549 GBLX Global Crossing Ltd.
        110.34.44.0/22 AS12653 COMTONET KB Impuls Hellas
        116.206.72.0/24 AS6461 MFNX MFN - Metromedia Fiber Network
        116.206.85.0/24 AS6461 MFNX MFN - Metromedia Fiber Network
        116.206.103.0/24 AS6461 MFNX MFN - Metromedia Fiber Network
        117.120.56.0/21 AS4755 TATACOMM-AS TATA Communications formerly VSNL is Leading ISP
        121.46.0.0/16 AS4134 CHINANET-BACKBONE No.31,Jin-rong Street
        142.54.0.0/19 AS23498 CDSI - Cogeco Data Services Inc.
        172.102.0.0/22 AS4812 CHINANET-SH-AP China Telecom (Group)
        181.82.15.0/24 AS23982 SENDB-AS-KR Dongbu District Office of Education in Seoul
        181.82.16.0/24 AS23982 SENDB-AS-KR Dongbu District Office of Education in Seoul
        181.82.17.0/24 AS38418 SENSD-AS-KR seoul seondong district office of education
        181.82.18.0/24 AS38418 SENSD-AS-KR seoul seondong district office of education
        190.102.32.0/20 AS30058 FDCSERVERS - FDCservers.net
        190.104.32.0/21 AS27882 Telef�nica Celular de Bolivia S.A.
        193.111.87.0/24 AS24812
        200.6.93.0/24 AS6400 Compa��a Dominicana de Tel�fonos, C. por A. - CODETEL
        200.6.94.0/24 AS6400 Compa��a Dominicana de Tel�fonos, C. por A. - CODETEL
        200.6.95.0/24 AS6400 Compa��a Dominicana de Tel�fonos, C. por A. - CODETEL
        200.23.84.0/24 AS8151 Uninet S.A. de C.V.
        200.24.73.0/24 AS26061 Equant Colombia
        200.24.76.0/24 AS7195 Telecorp Colombia S.A.
        200.24.78.0/26 AS3549 GBLX Global Crossing Ltd.
        200.24.78.64/26 AS3549 GBLX Global Crossing Ltd.
        200.33.40.0/24 AS11172 Alestra, S. de R.L. de C.V.
        200.34.0.0/20 AS6342 Instituto Tecnol�gico y de Estudios Superiores de Monterrey
        200.53.0.0/19 AS13878 Diveo do Brasil Telecomunicacoes Ltda
        202.1.224.0/24 AS10097 FLOWCOM Flow Communications 2/541 Kent St Sydney NSW 2000
        202.9.55.0/24 AS2764 AAPT AAPT Limited
        202.9.57.0/24 AS2764 AAPT AAPT Limited
        202.58.113.0/24 AS19161
        202.61.75.0/24 AS9927 PHILCOMNET-PH A Multihomed ISP Company
        202.74.232.0/24 AS17557 PKTELECOM-AS-PK Pakistan Telecommunication Company Limited
        202.74.233.0/24 AS17557 PKTELECOM-AS-PK Pakistan Telecommunication Company Limited
        202.83.120.0/21 AS37972
        202.83.124.0/24 AS37972
        202.83.125.0/24 AS37972
        202.83.126.0/24 AS37972
        202.94.1.0/24 AS4808 CHINA169-BJ CNCGROUP IP network China169 Beijing Province Network
        202.133.70.0/24 AS38616 WORLDCALL-AS-KHI Worldcall Telecom Limited
        202.160.152.0/22 AS10113 DATAFAST-AP DATAFAST TELECOMMUNICATIONS LTD
        202.174.125.0/24 AS9498 BBIL-AP BHARTI Airtel Ltd.
        202.176.1.0/24 AS9942 COMINDICO-AP SOUL Converged Communications Australia
        202.179.131.0/24 AS17557 PKTELECOM-AS-PK Pakistan Telecommunication Company Limited
        202.179.134.0/24 AS23966 LDN-AS-PK LINKdotNET Telecom Limited
        202.179.144.0/24 AS17557 PKTELECOM-AS-PK Pakistan Telecommunication Company Limited
        203.23.1.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications
        203.24.38.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications
        203.30.127.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications
        203.32.86.0/23 AS18111 NETSPEED-AS-AP Netspeed Internet Communications
        203.32.86.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications
        203.32.87.0/24 AS18111 NETSPEED-AS-AP Netspeed Internet Communications
        203.32.188.0/24 AS1221 ASN-TELSTRA Telstra Pty Ltd
        203.142.219.0/24 AS45149
        203.175.107.0/24 AS45595 PKTELECOM-AS-PK Pakistan Telecom Company Limited
        205.150.0.0/15 AS701 UUNET - MCI Communications Services, Inc. d/b/a Verizon Business
        205.175.214.0/24 AS5583 ORANGE-BUSINESS-SERVICES-BENELUX Orange Business Services (formerly Equant) AS for BENELUX
        205.207.148.0/23 AS812 ROGERS-CABLE - Rogers Cable Communications Inc.
        206.72.192.0/23 AS16526 BIRCH-TELECOM - Birch Telecom, Inc.
        206.72.194.0/23 AS16526 BIRCH-TELECOM - Birch Telecom, Inc.
        206.123.129.0/24 AS10790 INREACH-AS - InReach Internet
        206.180.240.0/20 AS12083 KNOLOGY-NET - Knology Holdings
        206.197.184.0/24 AS23304 DATOTEL-STL-AS - Datotel LLC, a NetLabs LLC Company
        207.174.131.0/24 AS26116 INDRA - Indra's Net Inc.
        207.174.132.0/23 AS26116 INDRA - Indra's Net Inc.
        207.174.152.0/23 AS26116 INDRA - Indra's Net Inc.
        207.174.154.0/24 AS26116 INDRA - Indra's Net Inc.
        207.174.155.0/24 AS26116 INDRA - Indra's Net Inc.
        207.174.200.0/24 AS22658 EARTHNET - Earthnet, Inc.
        207.174.248.0/21 AS6653 PRIVATEI - privateI, LLC
        207.231.96.0/19 AS11194 NUNETPA - NuNet Inc.
        208.64.240.0/21 AS13871 TELEBYTE-NW - Telebyte NW
        208.83.53.0/24 AS40569 YGOMI-AS - Ygomi LLC
        209.148.64.0/19 AS13773 TELNETCOMM - Telnet Communications
        209.177.64.0/20 AS6461 MFNX MFN - Metromedia Fiber Network
        209.213.0.0/20 AS33005 ELTOPIA - Eltopia.com, LLC
        210.56.150.0/23 AS38138 INTECH-TRANSIT-BD InTech Online Limited, INTERNET SERVICE LIMITED
        216.21.160.0/20 AS13818 PHX-INTL-TELEPORT - Phoenix International Teleport
        216.58.200.0/24 AS18530 ISOMEDIA-1 - Isomedia Inc.
        216.194.160.0/20 AS13818 PHX-INTL-TELEPORT - Phoenix International Teleport

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

2

I thought AS-plain notation was the standard for 4-byte ASN's? Also to cidr report folks, in the web version, clicking on the ASN for these takes you to the page for AS3 (MIT)

46.18.104.0/21 AS3.746
195.54.52.0/23 AS3.523
195.54.52.0/24 AS3.523
195.54.53.0/24 AS3.523

route-views>sh ip bgp 195.54.52.0
BGP routing table entry for 195.54.52.0/24, version 218523
Paths: (34 available, best #34, table Default-IP-Routing-Table)
  Not advertised to any peer
  3257 3356 3255 3.523 3.523 3.523
    89.149.178.10 from 89.149.178.10 (213.200.87.91)
      Origin IGP, metric 10, localpref 100, valid, external
      Community: 3257:8091 3257:30042 3257:50001 3257:54900 3257:54901

3

as-plain is not the "standard" per se. Think of it more as
the "preferred" option within the industry.

  o All major vendors support it, so there's no need
    to convert to as-dot when you upgrade your router
    software to support 4-byte ASN's.

  o as-plain doesn't break your AS_PATH regular
    expressions, which is very useful.

  o as-plain is a known representation format among
    operators, and 4-byte ASN's continuing this
    tradition keeps the network stable.

as-dot notation looks really Cool & Sexy (tm), but is
cumbersome for your AS_PATH regular expressions. It doesn't
make things impossible, just, well, cumbersome :-).

Hope this helps.

Cheers,

Mark.

4

RFC5396 on as-plain is on track becoming one.

Best regards,
Daniel

5

Wasn't there an RFC written about this by some australian bloke? I'd say
that whoever maintains the CIDR report these days should really take a
couple of minutes to clue themselves in about asplain syntax.

Nick

6

Strangely, both the RFC (5396) and the CIDR report appear to be written by the same guy...Geoff.

btw, am i the only one who finds it easier to remember asdot formatted ASNs?

7

Indeed.

I suppose it will be interesting to see how the vendors
respond to this. Would they retract support for as-dot, as
it's been shipping for a while now?

Cheers,

Mark.

8

They're easier to remember, but if you operate an ASN for a
reasonable period of time, it's okay to assume that you will
remember it, whether it's as-plain or otherwise.

The same would hold true for your favorite upstreams, peers,
customers and role model ISP's :-).

Cheers,

Mark.

9

I say we all start using octal two's complement for extended ASNs.

(note to self: don't post to NANOG after a night out with a vendor.)