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	Prefix	Description
	198.7.38.0/23	Alliant Energy
	198.7.42.0/23	Alliant Energy
	198.7.44.0/23	Alliant Energy
	198.7.46.0/23	Alliant Energy
	207.71.128.0/23	Alliant Energy
	207.71.134.0/23	Alliant Energy
	207.71.136.0/23	Alliant Energy
	207.71.142.0/23	Alliant Energy

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS4181	TDS TELECOM	✔	✘
	AS3356	Lumen (Level 3)	✔	✘
	AS393238	ImOn Communications, LLC	✔	✘
	AS40264	Charter Communications LLC	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS393238	ImOn Communications, LLC	✔	✘
	AS4181	TDS TELECOM	✔	✘
	AS40264	Charter Communications LLC	✔	✘
	AS3356	Lumen (Level 3)	✔	✘

ASHandle:       AS21896
OrgID:          ALLIA-101
ASName:         ALLIANT-ENERGY
ASNumber:       21896
RegDate:        2009-01-08
Updated:        2012-03-02
Source:         ARIN



OrgID:          ALLIA-101
OrgName:        Alliant Energy
CanAllocate:    
Street:         4902 North Biltmore Lane
City:           Madison
State/Prov:     WI
Country:        US
PostalCode:     53707-1007
Comment:        Standard NOC hours are 7am to 5pm CST
RegDate:        2008-12-30
Updated:        2020-12-08
OrgAdminHandle: DNA51-ARIN
OrgTechHandle:  DNA51-ARIN
OrgAbuseHandle: DNA51-ARIN
Source:         ARIN





OrgAdminHandle:       DNA51-ARIN
OrgAdminName:          Data Networks Admin
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        DNA51-ARIN
OrgTechName:           Data Networks Admin
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       DNA51-ARIN
OrgAbuseName:          Data Networks Admin
# Email removed, Log into bgp.tools to see whois emails

Last Update: 2025-12-26T03:34:46Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RADB	as-hurricane	24739
ARIN	as393238:as-customers	19
RADB	as-13986	474
RADB	as-chtr-bb	646
ARIN	as-test-tds-transit	98
RADB	as-windstream-cust	2135
ARIN	as-test2-tds-transit	98
ARIN	as-test1-tds-transit	98
RADB	as-sbcis-5102	9
RADB	as174:as-cogc-011	47
LEVEL3	as-lumen-customers-asns	10695
RADB	as16631:as-cogc-006	66
RIPE	as-transroute-spec	19683
ARIN	as-tds-transit	108
RADB	as-18474	473