AS21896 — ALLIANT-ENERGY - Alliant Energy

AS21896 announces 7 IPv4 prefixes covering 4,096 addresses and 0 IPv6 prefixes.

About this network

ALLIANT-ENERGY is operated by Alliant Energy, a major electric and natural gas utility serving the Midwest United States.

What it's used for

• The address space is registered under netnames NETBLK-ALI1 and NETBLK-ALI2, both assigned to Alliant Energy, indicating a corporate internal network for utility operations.
• The AS announces 4096 IPv4 addresses across 7 prefixes with only 4 observed neighbours, a ratio consistent with a private corporate estate rather than a public transit or access provider.

Notable

• All registrants in the RDAP data match the announcer, listing Alliant Energy for every prefix.
• The address inventory is finely subdivided into two distinct blocks (198.7.44.0/22 and 207.71.128.0/23 series), suggesting site-by-site segmentation typical of large industrial or utility infrastructure.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 198.7.38.0/23
• 198.7.42.0/23
• 198.7.44.0/22
• 207.71.128.0/23
• 207.71.134.0/23
• 207.71.136.0/23
• 207.71.142.0/23

Upstream networks

• AS393238 ImOn Communications, LLC
• AS4181 TDS TELECOM
• AS40264 Charter Communications LLC
• AS3356 Level 3 Parent, LLC

Adjacent networks

• AS393238 ImOn Communications, LLC
• AS4181 TDS TELECOM
• AS40264 Charter Communications LLC
• AS3356 Level 3 Parent, LLC

Routing security

• RPKI: 0 valid, 0 invalid and 8 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 41 route objects.
• Listed in as-sets: AS-13986, AS-18474, AS-CHIEF-TRANSIT, AS-CHTR-BB, AS-HURRICANE, AS-RR-SYNC, AS-SBCIS-5102, AS-TDS-TRANSIT, AS-TEST-TDS-TRANSIT, AS-TEST1-TDS-TRANSIT, AS-TEST2-TDS-TRANSIT, AS-TRANSROUTE-SPEC, AS-WINDSTREAM-CUST, AS393238:AS-CUSTOMERS.