Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS15157

Announcement observedARIN

NORTHWESTERN CORPORATION · NORWORLD

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active9/30/2026, 13:59:03Snapshot expired

View network topology RDAP registration

ASN: AS15157
Registration country: United States
Name: NORTHWESTERN CORPORATION
Abbreviation: NORWORLD
Registration date: 3/27/2000, 05:00:00
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
199.3.108.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 08:00:00	9/30/2026, 08:00:00	✓	×	Currently valid
199.3.109.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 08:00:00	9/30/2026, 08:00:00	✓	×	Currently valid
206.107.235.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 08:00:00	9/30/2026, 08:00:00	✓	×	Currently valid

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: NORTHWESTERN CORPORATION
RIR: ARIN
Registration country: United States
Registration date: 3/27/2000, 05:00:00
Abuse contact: Sean.Cleverly@northwestern.com

Snapshot trend

9/30/2026, 13:59:033 v40 v62 Upstream · 0 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: cha-la-external-routing · iana-rdap-asn-bootstrap · rir-rdap-asn