ASN Lookup Tool

Alliant Energy alliantenergy.com US US 8 Routes

AS Data

AS21896

AS21896 – Alliant Energy

AS Number 21896
AS Name ALLIANT-ENERGY
Organization Alliant Energy(allia-101)
Country US
Website alliantenergy.com
Number of IPv4 Routes 8
Number of IPv6 Routes 0
ASN type BUSINESS
Registry ARIN
Date Allocated 2009-01-08

ASN Intelligence API for production workflows

Use ASN data for AS21896 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
198.7.46.0/23 512
198.7.44.0/23 512
207.71.142.0/23 512
207.71.128.0/23 512
198.7.42.0/23 512
207.71.136.0/23 512
207.71.134.0/23 512
198.7.38.0/23 512

Raw Whois Response

#
# 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


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

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


#
# 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.
#

Parsed Whois Response

Peers

AS Number Description Country
AS40264 Charter Communications LLC US
AS3356 Level 3 Parent, LLC US
AS4181 TDS TELECOM US
AS393238 ImOn Communications, LLC US

Upstreams

AS Number Description Country
AS40264 Charter Communications LLC US
AS3356 Level 3 Parent, LLC US
AS4181 TDS TELECOM US
AS393238 ImOn Communications, LLC US

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Frequently Asked Questions

ASN AS21896 is an Autonomous System Number used to identify a network for BGP internet routing.
AS21896 is listed under Alliant Energy.
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.