ASN AS15157 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS15157?

AS15157 is listed under NORTHWESTERN CORPORATION.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS15157 NORTHWESTERN CORPORATION

ASN Lookup Tool

NORTHWESTERN CORPORATION northwestern.com

US 3 Routes

AS Data

AS15157

AS15157 – NORTHWESTERN CORPORATION

AS Number	15157
AS Name	NORWORLD
Organization	NORTHWESTERN CORPORATION(northw-28)
Country	US
Website	northwestern.com
Number of IPv4 Routes	3
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2000-03-27

ASN Intelligence API for production workflows

Use ASN data for AS15157 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
206.107.235.0/24	AS15157	NORTHWESTERN CORPORATION	NORTHWESTERN CORPORATION	256
199.3.108.0/24	AS15157	NORTHWESTERN CORPORATION	NORTHWESTERN CORPORATION	256
199.3.109.0/24	AS15157	NORTHWESTERN CORPORATION	NORTHWESTERN CORPORATION	256

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:       15157
ASName:         NORWORLD
ASHandle:       AS15157
RegDate:        2000-03-27
Updated:        2012-03-02    
Ref:            https://rdap.arin.net/registry/autnum/15157


OrgName:        NORTHWESTERN CORPORATION
OrgId:          NORTHW-28
Address:        125 S. Dakota Ave.
City:           Sioux Falls
StateProv:      SD
PostalCode:     57104
Country:        US
RegDate:        1999-10-22
Updated:        2023-12-12
Ref:            https://rdap.arin.net/registry/entity/NORTHW-28


OrgRoutingHandle: FERRI236-ARIN
OrgRoutingName:   Ferriter, Kelly 
OrgRoutingPhone:  +1-406-497-4585 
OrgRoutingEmail:  kelly.ferriter@northwestern.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/FERRI236-ARIN

OrgAbuseHandle: SC1244-ARIN
OrgAbuseName:   Cleverly, Sean 
OrgAbusePhone:  +1-406-497-4131 
OrgAbuseEmail:  Sean.Cleverly@northwestern.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/SC1244-ARIN

OrgTechHandle: WILSO1898-ARIN
OrgTechName:   Wilson, Theron 
OrgTechPhone:  +1-406-497-1652 
OrgTechEmail:  theron.wilson@northwestern.com
OrgTechRef:    https://rdap.arin.net/registry/entity/WILSO1898-ARIN

RTechHandle: LHG8-ARIN
RTechName:   Gates, Lorrie H
RTechPhone:  +1-406-497-2870 
RTechEmail:  lorrie.gates@northwestern.com
RTechRef:    https://rdap.arin.net/registry/entity/LHG8-ARIN

RTechHandle: SC1244-ARIN
RTechName:   Cleverly, Sean 
RTechPhone:  +1-406-497-4131 
RTechEmail:  Sean.Cleverly@northwestern.com
RTechRef:    https://rdap.arin.net/registry/entity/SC1244-ARIN

RAbuseHandle: SC1244-ARIN
RAbuseName:   Cleverly, Sean 
RAbusePhone:  +1-406-497-4131 
RAbuseEmail:  Sean.Cleverly@northwestern.com
RAbuseRef:    https://rdap.arin.net/registry/entity/SC1244-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
AS1239	Cogent Communications, LLC	US
AS13576	SDN Communications	US
AS22629	NORTHWESTERN CORPORATION	US
AS174	Cogent Communications, LLC	US

Upstreams

AS Number	Description	Country
AS13576	SDN Communications	US
AS174	Cogent Communications, LLC	US

Downstreams

AS Number	Description	Country
AS22629	NORTHWESTERN CORPORATION	US