Report for 21896

Name

ALLIANT-ENERGY - Alliant Energy, 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.

21896 ALLIANT-ENERGY - Alliant Energy, US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS4181          TDS-AS - TDS TELECOM, US
    AS393238        IMONC - ImOn Communications, LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
16941 AS21896        ORIGIN  Originate:       4096 /20.00  Transit:          0 /0.00  ALLIANT-ENERGY - Alliant Energy, 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       %
21684 AS21896       ALLIANT-ENERGY - Alliant Energy, US                8      2      1      7      1  12.50%


  Prefix               AS Path                              Aggregation Suggestion
  198.7.38.0/23        4777 2497 4181 21896   
  198.7.42.0/23        4777 2497 4181 21896   
  198.7.44.0/22        4777 2497 4181 21896 + Announce - aggregate of 198.7.44.0/23 (4777 2497 4181 21896) and 198.7.46.0/23 (4777 2497 4181 21896)
  198.7.44.0/23        4777 2497 4181 21896 - Withdrawn - aggregated with 198.7.46.0/23 (4777 2497 4181 21896)
  198.7.46.0/23        4777 2497 4181 21896 - Withdrawn - aggregated with 198.7.44.0/23 (4777 2497 4181 21896)
  207.71.128.0/23      4777 6939 393238 21896   
  207.71.134.0/23      4777 6939 393238 21896   
  207.71.136.0/23      4777 6939 393238 21896   
  207.71.142.0/23      4777 6939 393238 21896   

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

AS21896   8 More Specifics   8 Total Advertisements   ALLIANT-ENERGY - Alliant Energy, US
    198.7.38.0/23                 198.7.32.0/20
    198.7.42.0/23                 198.7.32.0/20
    198.7.44.0/23                 198.7.32.0/20
    198.7.46.0/23                 198.7.32.0/20
    207.71.128.0/23               207.71.128.0/19
    207.71.134.0/23               207.71.128.0/19
    207.71.136.0/23               207.71.128.0/19
    207.71.142.0/23               207.71.128.0/19

Whois Entry

whois: 402332

IANA has recorded AS21896 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS21896\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:       21896
             ASName:         ALLIANT-ENERGY
             ASHandle:       AS21896
             RegDate:        2009-01-08
             Updated:        2012-03-02
             Ref:            https://rdap.arin.net/registry/autnum/21896
             
             
             OrgName:        Alliant Energy
             OrgId:          ALLIA-101
             Address:        4902 North Biltmore Lane
             City:           Madison
             StateProv:      WI
             PostalCode:     53707-1007
             Country:        US
             RegDate:        2008-12-30
             Updated:        2020-12-08
             Comment:        Standard NOC hours are 7am to 5pm CST
             Ref:            https://rdap.arin.net/registry/entity/ALLIA-101
             
             
             OrgAbuseHandle: DNA51-ARIN
             OrgAbuseName:   Data Networks Admin
             OrgAbusePhone:  +1-608-458-4357 
             OrgAbuseEmail:  DL_IT_Data_Network-ALI@alliantenergy.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/DNA51-ARIN
             
             OrgTechHandle: DNA51-ARIN
             OrgTechName:   Data Networks Admin
             OrgTechPhone:  +1-608-458-4357 
             OrgTechEmail:  DL_IT_Data_Network-ALI@alliantenergy.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/DNA51-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.
             #