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Geoff Huston

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IPv6 CIDR REPORT for 23 Jul 19

Report Sections:


This report is generated from an analysis of the BGP routing table withinAS131072, and was produced at Tue Jul 23 19:45:43 2019 AEST.


Status Summary

Table History


        Date      Prefixes    CIDR Agg
        16-07-19     72160       42591
        17-07-19     72277       42632
        18-07-19     72345       42973
        19-07-19     72478       43063
        20-07-19     72469       43091
        21-07-19     72508       43095
        22-07-19     72474       43105
        23-07-19     72501       43105

 

AS Summary


         17630  Number of ASes in routing system
         11441  Number of ASes announcing only one prefix
          1277  Largest number of prefixes announced by an AS
                AS12479: UNI2-AS, ES
      36318243520512 (/18.95) Largest address span announced by an AS (/64s)
                AS7922 : COMCAST-7922 - Comcast Cable Communications, LLC, US


Aggregation Summary


The algorithm used in this report proposes aggregation only when there is a precise match using AS path so as to preserve traffic transit policies.

         --- 23Jul19 ---
        ASnum    NetsNow NetsAggr  NetGain   % Gain   Description

        Table      72563    43140    29423    40.5%   All ASes

        AS12479     1277        5     1272    99.6%   UNI2-AS, ES
        AS28573     1109      123      986    88.9%   CLARO S.A., BR
        AS11172     1126      191      935    83.0%   Alestra, S. de R.L. de C.V., MX
        AS22773      989       77      912    92.2%   ASN-CXA-ALL-CCI-22773-RDC - Cox Communications Inc., US
        AS7552       796        7      789    99.1%   VIETEL-AS-AP Viettel Group, VN
        AS8376      1191      443      748    62.8%   , JO
        AS45609      854      122      732    85.7%   BHARTI-MOBILITY-AS-AP Bharti Airtel Ltd. AS for GPRS Service, IN
        AS32098      697       15      682    97.8%   TRANSTELCO-INC - Transtelco Inc, US
        AS33363      685       69      616    89.9%   BHN-33363 - Charter Communications, Inc, US
        AS30036      916      419      497    54.3%   MEDIACOM-ENTERPRISE-BUSINESS - Mediacom Communications Corp, US
        AS45271      604      163      441    73.0%   ICLNET-AS-AP Idea Cellular Limited, IN
        AS16509      967      574      393    40.6%   AMAZON-02 - Amazon.com, Inc., US
        AS13361      598      212      386    64.5%   VODAFONE-AS-AP Vodafone Australia Pty Ltd, AU
        AS9829       444      100      344    77.5%   BSNL-NIB National Internet Backbone, IN
        AS9808       352       31      321    91.2%   CMNET-GD Guangdong Mobile Communication Co.Ltd., CN
        AS174        447      139      308    68.9%   COGENT-174 - Cogent Communications, US
        AS13142      313       28      285    91.1%   MOBIFONE-AS-VN MOBIFONE Corporation, VN
        AS9605       272       14      258    94.9%   DOCOMO NTT DOCOMO, INC., JP
        AS13206      258        1      257    99.6%   REALMOVE-AS-AP Realmove Company Limited, TH
        AS24173      258        2      256    99.2%   NETNAM-AS-AP Netnam Company, VN
        AS55430      291       38      253    86.9%   STARHUB-NGNBN Starhub Ltd, SG
        AS4808       232       28      204    87.9%   CHINA169-BJ China Unicom Beijing Province Network, CN
        AS3462       267       70      197    73.8%   HINET Data Communication Business Group, TW
        AS17552      241       46      195    80.9%   TRUE-AS-AP True Internet Co.,Ltd., TH
        AS54113      614      419      195    31.8%   FASTLY - Fastly, US
        AS8151       292      114      178    61.0%   Uninet S.A. de C.V., MX
        AS38266      277      103      174    62.8%   VODAFONE-IN Vodafone India Ltd., IN
        AS22394      673      503      170    25.3%   CELLCO - Cellco Partnership DBA Verizon Wireless, US
        AS4134       202       38      164    81.2%   CHINANET-BACKBONE No.31,Jin-rong Street, CN
        AS17622      495      332      163    32.9%   CNCGROUP-GZ China Unicom Guangzhou network, CN

        Total      17737     4426    13311    75.0%   Top 30 total


        Top 20 Route Count per Originating AS
        Prefixes ASnum   AS Description
            1277 AS12479 UNI2-AS, ES
            1191 AS8376  , JO
            1126 AS11172 Alestra, S. de R.L. de C.V., MX
            1109 AS28573 CLARO S.A., BR
             989 AS22773 ASN-CXA-ALL-CCI-22773-RDC - Cox Communications Inc., US
             967 AS16509 AMAZON-02 - Amazon.com, Inc., US
             916 AS30036 MEDIACOM-ENTERPRISE-BUSINESS - Mediacom Communications Corp, US
             854 AS45609 BHARTI-MOBILITY-AS-AP Bharti Airtel Ltd. AS for GPRS Service, IN
             796 AS7552  VIETEL-AS-AP Viettel Group, VN
             697 AS32098 TRANSTELCO-INC - Transtelco Inc, US
             692 AS13335 CLOUDFLARENET - Cloudflare, Inc., US
             685 AS33363 BHN-33363 - Charter Communications, Inc, US
             673 AS22394 CELLCO - Cellco Partnership DBA Verizon Wireless, US
             614 AS54113 FASTLY - Fastly, US
             604 AS45271 ICLNET-AS-AP Idea Cellular Limited, IN
             598 AS133612 VODAFONE-AS-AP Vodafone Australia Pty Ltd, AU
             542 AS20940 AKAMAI-ASN1, US
             495 AS17622 CNCGROUP-GZ China Unicom Guangzhou network, CN
             447 AS174   COGENT-174 - Cogent Communications, US
             444 AS9829  BSNL-NIB National Internet Backbone, IN


Last Week's Changes


This a daily snapshot of changes in routes being withdrawn and added. The deltas are calculated over a rolling 7 day period. Please bear in mind this is purely a "snapshot" and a large flucuation could be caused by a connectivity problem, for example.