Report for 26101

Name

YAHOO-BF1 - Yahoo Holdings Inc., US

AS Adjacency Report

In the context of this report "Upstream" indicates that there is an adjacent AS that lines between the BGP table collection point (in this case at AS2.0) and the specified AS. Similarly, "Downstream" refers to an adjacent AS that lies beyond the specified AS. This upstream / downstream categorisation is strictly a description relative topology, and should not be confused with provider / customer / peer inter-AS relationships.

26101 YAHOO-BF1 - Yahoo Holdings Inc., US

  Adjacency:     1  Upstream:     1  Downstream:     0
  Upstream Adjacent AS list
    AS10310         YAHOO-1 - Yahoo Holdings Inc., US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
1731  AS26101        ORIGIN  Originate:     137984 /14.93  Transit:          0 /0.00  YAHOO-BF1 - Yahoo Holdings Inc., US

Aggregation Suggestions

        Filter: Aggregates, Specifics

This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.

 Rank AS            AS Name                                      Current  Wthdw  Aggte  Annce Redctn       %
 1238 AS26101       YAHOO-BF1 - Yahoo Holdings Inc., US               76     54      5     27     49  64.47%


  Prefix               AS Path                              Aggregation Suggestion
  63.250.196.0/22      4608 7575 10310 26101   
  63.250.200.0/21      4608 7575 10310 26101   
  66.196.80.0/21       4608 7575 10310 26101   
  66.196.88.0/23       4608 7575 10310 26101   
  66.196.104.0/21      4608 7575 10310 26101   
  66.196.109.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 66.196.104.0/21 4608 7575 10310 26101
  66.196.112.0/21      4608 7575 10310 26101   
  66.218.80.0/20       4608 7575 10310 26101   
  66.218.84.0/24       4608 7575 10310 26101 - Withdrawn - matching aggregate 66.218.80.0/20 4608 7575 10310 26101
  66.218.85.0/24       4608 7575 10310 26101 - Withdrawn - matching aggregate 66.218.80.0/20 4608 7575 10310 26101
  66.218.86.0/24       4608 7575 10310 26101 - Withdrawn - matching aggregate 66.218.80.0/20 4608 7575 10310 26101
  66.218.87.0/24       4608 7575 10310 26101 - Withdrawn - matching aggregate 66.218.80.0/20 4608 7575 10310 26101
  67.195.176.0/20      4608 7575 10310 26101   
  67.195.192.0/19      4608 7575 10310 26101   
  67.195.204.0/22      4608 7575 10310 26101 - Withdrawn - matching aggregate 67.195.192.0/19 4608 7575 10310 26101
  67.195.204.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 67.195.192.0/19 4608 7575 10310 26101
  67.195.205.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 67.195.192.0/19 4608 7575 10310 26101
  67.195.216.0/22      4608 7575 10310 26101 - Withdrawn - matching aggregate 67.195.192.0/19 4608 7575 10310 26101
  67.195.220.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 67.195.192.0/19 4608 7575 10310 26101
  67.195.221.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 67.195.192.0/19 4608 7575 10310 26101
  68.142.216.0/21      4608 7575 10310 26101   
  68.142.224.0/20      4608 7575 10310 26101 + Announce - aggregate of 68.142.224.0/21 (4608 7575 10310 26101) and 68.142.232.0/21 (4608 7575 10310 26101)
  68.142.224.0/21      4608 7575 10310 26101 - Withdrawn - aggregated with 68.142.232.0/21 (4608 7575 10310 26101)
  68.142.232.0/22      4608 7575 10310 26101 - Withdrawn - aggregated with 68.142.236.0/22 (4608 7575 10310 26101)
  68.142.236.0/22      4608 7575 10310 26101 - Withdrawn - aggregated with 68.142.232.0/22 (4608 7575 10310 26101)
  69.147.72.0/21       4608 7575 10310 26101   
  69.147.112.0/20      4608 7575 10310 26101   
  69.147.120.0/21      4608 7575 10310 26101 - Withdrawn - matching aggregate 69.147.112.0/20 4608 7575 10310 26101
  72.30.0.0/18         4608 7575 10310 26101 + Announce - aggregate of 72.30.0.0/19 (4608 7575 10310 26101) and 72.30.32.0/19 (4608 7575 10310 26101)
  72.30.0.0/19         4608 7575 10310 26101 - Withdrawn - aggregated with 72.30.32.0/19 (4608 7575 10310 26101)
  72.30.2.0/24         4608 7575 10310 26101 - Withdrawn - matching aggregate 72.30.0.0/19 4608 7575 10310 26101
  72.30.3.0/24         4608 7575 10310 26101 - Withdrawn - matching aggregate 72.30.0.0/19 4608 7575 10310 26101
  72.30.22.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 72.30.0.0/19 4608 7575 10310 26101
  72.30.32.0/19        4608 7575 10310 26101 - Withdrawn - aggregated with 72.30.0.0/19 (4608 7575 10310 26101)
  72.30.35.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 72.30.32.0/19 4608 7575 10310 26101
  72.30.60.0/22        4608 7575 10310 26101 - Withdrawn - matching aggregate 72.30.32.0/19 4608 7575 10310 26101
  72.30.60.0/23        4608 7575 10310 26101 - Withdrawn - matching aggregate 72.30.32.0/19 4608 7575 10310 26101
  72.30.62.0/23        4608 7575 10310 26101 - Withdrawn - matching aggregate 72.30.32.0/19 4608 7575 10310 26101
  72.30.192.0/20       4608 7575 10310 26101   
  72.30.205.0/24       4608 7575 10310 26101 - Withdrawn - matching aggregate 72.30.192.0/20 4608 7575 10310 26101
  74.6.48.0/22         4608 7575 10310 26101   
  74.6.96.0/19         4608 7575 10310 26101   
  74.6.96.0/24         4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.96.0/19 4608 7575 10310 26101
  74.6.106.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.96.0/19 4608 7575 10310 26101
  74.6.128.0/20        4608 7575 10310 26101 + Announce - aggregate of 74.6.128.0/21 (4608 7575 10310 26101) and 74.6.136.0/21 (4608 7575 10310 26101)
  74.6.128.0/21        4608 7575 10310 26101 - Withdrawn - aggregated with 74.6.136.0/21 (4608 7575 10310 26101)
  74.6.136.0/22        4608 7575 10310 26101 - Withdrawn - aggregated with 74.6.140.0/22 (4608 7575 10310 26101)
  74.6.136.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.136.0/22 4608 7575 10310 26101
  74.6.137.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.136.0/22 4608 7575 10310 26101
  74.6.138.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.136.0/22 4608 7575 10310 26101
  74.6.139.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.136.0/22 4608 7575 10310 26101
  74.6.140.0/22        4608 7575 10310 26101 - Withdrawn - aggregated with 74.6.136.0/22 (4608 7575 10310 26101)
  74.6.140.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.140.0/22 4608 7575 10310 26101
  74.6.141.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.140.0/22 4608 7575 10310 26101
  74.6.142.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.140.0/22 4608 7575 10310 26101
  74.6.143.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.140.0/22 4608 7575 10310 26101
  74.6.144.0/21        4608 7575 10310 26101 + Announce - aggregate of 74.6.144.0/22 (4608 7575 10310 26101) and 74.6.148.0/22 (4608 7575 10310 26101)
  74.6.144.0/22        4608 7575 10310 26101 - Withdrawn - aggregated with 74.6.148.0/22 (4608 7575 10310 26101)
  74.6.144.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.144.0/22 4608 7575 10310 26101
  74.6.145.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.144.0/22 4608 7575 10310 26101
  74.6.146.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.144.0/22 4608 7575 10310 26101
  74.6.147.0/24        4608 7575 10310 26101 - Withdrawn - matching aggregate 74.6.144.0/22 4608 7575 10310 26101
  74.6.148.0/22        4608 7575 10310 26101 - Withdrawn - aggregated with 74.6.144.0/22 (4608 7575 10310 26101)
  74.6.248.0/21        4608 7575 10310 26101   
  98.137.192.0/21      4608 7575 10310 26101   
  98.139.8.0/22        4608 7575 10310 26101   
  98.139.16.0/20       4608 7575 10310 26101 + Announce - aggregate of 98.139.16.0/21 (4608 7575 10310 26101) and 98.139.24.0/21 (4608 7575 10310 26101)
  98.139.16.0/21       4608 7575 10310 26101 - Withdrawn - aggregated with 98.139.24.0/21 (4608 7575 10310 26101)
  98.139.16.0/24       4608 7575 10310 26101 - Withdrawn - matching aggregate 98.139.16.0/21 4608 7575 10310 26101
  98.139.17.0/24       4608 7575 10310 26101 - Withdrawn - matching aggregate 98.139.16.0/21 4608 7575 10310 26101
  98.139.21.0/24       4608 7575 10310 26101 - Withdrawn - matching aggregate 98.139.16.0/21 4608 7575 10310 26101
  98.139.24.0/21       4608 7575 10310 26101 - Withdrawn - aggregated with 98.139.16.0/21 (4608 7575 10310 26101)
  98.139.32.0/20       4608 7575 10310 26101   
  98.139.44.0/23       4608 7575 10310 26101 - Withdrawn - matching aggregate 98.139.32.0/20 4608 7575 10310 26101
  98.139.124.0/22      4608 7575 10310 26101   
  98.139.128.0/17      4608 7575 10310 26101   
  98.139.133.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 98.139.128.0/17 4608 7575 10310 26101
  98.139.155.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 98.139.128.0/17 4608 7575 10310 26101
  98.139.199.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 98.139.128.0/17 4608 7575 10310 26101
  98.139.225.0/24      4608 7575 10310 26101 - Withdrawn - matching aggregate 98.139.128.0/17 4608 7575 10310 26101
  209.73.180.0/22      4608 7575 10310 26101   

Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.

AS26101   76 More Specifics   76 Total Advertisements   YAHOO-BF1 - Yahoo Holdings Inc., US
    63.250.196.0/22               63.250.192.0/19
    63.250.200.0/21               63.250.192.0/19
    66.196.80.0/21                66.196.64.0/18
    66.196.88.0/23                66.196.64.0/18
    66.196.104.0/21               66.196.64.0/18
    66.196.109.0/24               66.196.64.0/18
    66.196.112.0/21               66.196.64.0/18
    66.218.80.0/20                66.218.64.0/19
    66.218.84.0/24                66.218.64.0/19
    66.218.85.0/24                66.218.64.0/19
    66.218.86.0/24                66.218.64.0/19
    66.218.87.0/24                66.218.64.0/19
    67.195.176.0/20               67.195.0.0/16
    67.195.192.0/19               67.195.0.0/16
    67.195.204.0/22               67.195.0.0/16
    67.195.204.0/24               67.195.0.0/16
    67.195.205.0/24               67.195.0.0/16
    67.195.216.0/22               67.195.0.0/16
    67.195.220.0/24               67.195.0.0/16
    67.195.221.0/24               67.195.0.0/16
    68.142.216.0/21               68.142.192.0/18
    68.142.224.0/21               68.142.192.0/18
    68.142.232.0/22               68.142.192.0/18
    68.142.236.0/22               68.142.192.0/18
    69.147.72.0/21                69.147.64.0/18
    69.147.112.0/20               69.147.64.0/18
    69.147.120.0/21               69.147.64.0/18
    72.30.0.0/19                  72.30.0.0/16
    72.30.2.0/24                  72.30.0.0/16
    72.30.3.0/24                  72.30.0.0/16
    72.30.22.0/24                 72.30.0.0/16
    72.30.32.0/19                 72.30.0.0/16
    72.30.35.0/24                 72.30.0.0/16
    72.30.60.0/22                 72.30.0.0/16
    72.30.60.0/23                 72.30.0.0/16
    72.30.62.0/23                 72.30.0.0/16
    72.30.192.0/20                72.30.0.0/16
    72.30.205.0/24                72.30.0.0/16
    74.6.48.0/22                  74.6.0.0/16
    74.6.96.0/19                  74.6.0.0/16
    74.6.96.0/24                  74.6.0.0/16
    74.6.106.0/24                 74.6.0.0/16
    74.6.128.0/21                 74.6.0.0/16
    74.6.136.0/22                 74.6.0.0/16
    74.6.136.0/24                 74.6.0.0/16
    74.6.137.0/24                 74.6.0.0/16
    74.6.138.0/24                 74.6.0.0/16
    74.6.139.0/24                 74.6.0.0/16
    74.6.140.0/22                 74.6.0.0/16
    74.6.140.0/24                 74.6.0.0/16
    74.6.141.0/24                 74.6.0.0/16
    74.6.142.0/24                 74.6.0.0/16
    74.6.143.0/24                 74.6.0.0/16
    74.6.144.0/22                 74.6.0.0/16
    74.6.144.0/24                 74.6.0.0/16
    74.6.145.0/24                 74.6.0.0/16
    74.6.146.0/24                 74.6.0.0/16
    74.6.147.0/24                 74.6.0.0/16
    74.6.148.0/22                 74.6.0.0/16
    74.6.248.0/21                 74.6.0.0/16
    98.137.192.0/21               98.136.0.0/14
    98.139.8.0/22                 98.136.0.0/14
    98.139.16.0/21                98.136.0.0/14
    98.139.16.0/24                98.136.0.0/14
    98.139.17.0/24                98.136.0.0/14
    98.139.21.0/24                98.136.0.0/14
    98.139.24.0/21                98.136.0.0/14
    98.139.32.0/20                98.136.0.0/14
    98.139.44.0/23                98.136.0.0/14
    98.139.124.0/22               98.136.0.0/14
    98.139.128.0/17               98.136.0.0/14
    98.139.133.0/24               98.136.0.0/14
    98.139.155.0/24               98.136.0.0/14
    98.139.199.0/24               98.136.0.0/14
    98.139.225.0/24               98.136.0.0/14
    209.73.180.0/22               209.73.160.0/19

Whois Entry

whois: 402603

IANA has recorded AS26101 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS26101\n             
             #
             # ARIN WHOIS data and services are subject to the Terms of Use
             # available at: https://www.arin.net/resources/registry/whois/tou/
             #
             # If you see inaccuracies in the results, please report at
             # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
             #
             # Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
             #
             
             
             ASNumber:       26101
             ASName:         YAHOO-BF1
             ASHandle:       AS26101
             RegDate:        2002-07-05
             Updated:        2020-07-21
             Ref:            https://rdap.arin.net/registry/autnum/26101
             
             
             OrgName:        Yahoo Holdings Inc.
             OrgId:          OH-207
             Address:        770 BROADWAY FL 9
             City:           New York
             StateProv:      NY
             PostalCode:     10003-9558
             Country:        US
             RegDate:        2018-12-21
             Updated:        2025-09-03
             Ref:            https://rdap.arin.net/registry/entity/OH-207
             
             
             OrgTechHandle: OTC2-ARIN
             OrgTechName:   Oath Tech Contact
             OrgTechPhone:  +1-408-349-5555 
             OrgTechEmail:  rir-tech@oath.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/OTC2-ARIN
             
             OrgNOCHandle: OATHN-ARIN
             OrgNOCName:   Oath NOC
             OrgNOCPhone:  +1-408-349-5555 
             OrgNOCEmail:  rir-noc@yahooinc.com
             OrgNOCRef:    https://rdap.arin.net/registry/entity/OATHN-ARIN
             
             OrgAbuseHandle: OATHA-ARIN
             OrgAbuseName:   Oath Abuse
             OrgAbusePhone:  +1-408-349-3300 
             OrgAbuseEmail:  network-abuse@cc.yahoo-inc.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/OATHA-ARIN
             
             
             #
             # ARIN WHOIS data and services are subject to the Terms of Use
             # available at: https://www.arin.net/resources/registry/whois/tou/
             #
             # If you see inaccuracies in the results, please report at
             # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
             #
             # Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
             #