ASN AS103 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS103?

AS103 is listed under Northwestern University.

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.

AS103 Northwestern University

ASN Lookup Tool

Northwestern University northwestern.edu

US 29 Routes

AS Data

AS103

AS103 – Northwestern University

AS Number	103
AS Name	NWU-AS
Organization	Northwestern University(northw-9-z)
Country	US
Website	northwestern.edu
Number of IPv4 Routes	28
Number of IPv6 Routes	1
ASN type	EDUCATION
Registry	ARIN
Date Allocated	1987-04-09

ASN Intelligence API for production workflows

Use ASN data for AS103 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
165.124.240.0/20	AS103	Northwestern University	Northwestern University	4096
192.5.143.0/24	AS103	Northwestern University	Northwestern University	256
192.26.86.0/23	AS103	Northwestern University	Northwestern University	512
199.249.165.0/24	AS103	Northwestern University	Northwestern University	256
165.124.128.0/19	AS103	Northwestern University	Northwestern University	8192
199.249.168.0/23	AS103	Northwestern University	Northwestern University	512
192.31.253.0/24	AS103	Northwestern University	Northwestern University	256
192.26.85.0/24	AS103	Northwestern University	Northwestern University	256
199.249.169.0/24	AS103	Northwestern University	Northwestern University	256
165.124.224.0/21	AS103	Northwestern University	Northwestern University	2048

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:       103
ASName:         NWU-AS
ASHandle:       AS103
RegDate:        1987-04-09
Updated:        2012-04-02    
Ref:            https://rdap.arin.net/registry/autnum/103


OrgName:        Northwestern University
OrgId:          NORTHW-9-Z
Address:        Leverone Hall #G-166
Address:        2001 Sheridan Rd
City:           Evanston
StateProv:      IL
PostalCode:     60208
Country:        US
RegDate:        2010-01-08
Updated:        2012-05-11
Ref:            https://rdap.arin.net/registry/entity/NORTHW-9-Z


OrgAbuseHandle: NUNS-ARIN
OrgAbuseName:   Northwestern University Network Security
OrgAbusePhone:  +1-847-467-2222 
OrgAbuseEmail:  security@northwestern.edu
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NUNS-ARIN

OrgTechHandle: NUNA-ARIN
OrgTechName:   Northwestern University Network Administration
OrgTechPhone:  +1-847-467-2222 
OrgTechEmail:  data-network@northwestern.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/NUNA-ARIN

RTechHandle: NUNA-ARIN
RTechName:   Northwestern University Network Administration
RTechPhone:  +1-847-467-2222 
RTechEmail:  data-network@northwestern.edu
RTechRef:    https://rdap.arin.net/registry/entity/NUNA-ARIN

RAbuseHandle: NUNS-ARIN
RAbuseName:   Northwestern University Network Security
RAbusePhone:  +1-847-467-2222 
RAbuseEmail:  security@northwestern.edu
RAbuseRef:    https://rdap.arin.net/registry/entity/NUNS-ARIN

RNOCHandle: NUN-ARIN
RNOCName:   Northwestern University NOC
RNOCPhone:  +1-847-467-2222 
RNOCEmail:  data-network@northwestern.edu
RNOCRef:    https://rdap.arin.net/registry/entity/NUN-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
AS22335	Metropolitan Research and Education Network	US
AS2381	WiscNet	US
AS19782	Indiana University	US
AS33491	Comcast Cable Communications, LLC	US
AS293	ESnet	US
AS40387	University of Illinois	US
AS396450	Internet2	US
AS11537	Internet2	US
AS11164	Internet2	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS22335	Metropolitan Research and Education Network	US
AS2381	WiscNet	US
AS33491	Comcast Cable Communications, LLC	US
AS293	ESnet	US
AS396450	Internet2	US
AS11537	Internet2	US
AS11164	Internet2	US
AS3356	Level 3 Parent, LLC	US
AS174	Cogent Communications, LLC	US