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AS21643 Midwestern University

Q: Why is WHOIS data shown for an ASN?

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

ASN Lookup Tool

Midwestern University midwestern.edu

US 1 Routes

AS Data

AS21643

AS21643 – Midwestern University

AS Number	21643
AS Name	MWU-ASN
Organization	Midwestern University(midwes-1)
Country	US
Website	midwestern.edu
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	EDUCATION
Registry	ARIN
Date Allocated	2014-10-14

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Use ASN data for AS21643 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
204.152.157.0/24	AS21643	Midwestern University	Midwestern University	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:       21643
ASName:         MWU-ASN
ASHandle:       AS21643
RegDate:        2014-10-14
Updated:        2014-10-14    
Ref:            https://rdap.arin.net/registry/autnum/21643


OrgName:        Midwestern University
OrgId:          MIDWES-1
Address:        555 31st St.
City:           Downers Grove
StateProv:      IL
PostalCode:     60515
Country:        US
RegDate:        1996-01-24
Updated:        2011-09-24
Ref:            https://rdap.arin.net/registry/entity/MIDWES-1


OrgAbuseHandle: JGJ12-ARIN
OrgAbuseName:   Jacobson, James G.
OrgAbusePhone:  +1-630-515-7351 
OrgAbuseEmail:  jjacob@midwestern.edu
OrgAbuseRef:    https://rdap.arin.net/registry/entity/JGJ12-ARIN

OrgTechHandle: JGJ12-ARIN
OrgTechName:   Jacobson, James G.
OrgTechPhone:  +1-630-515-7351 
OrgTechEmail:  jjacob@midwestern.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/JGJ12-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
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS3356	Level 3 Parent, LLC	US

Frequently Asked Questions

What is ASN AS21643?

ASN AS21643 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21643?

AS21643 is listed under Midwestern University.

What do peers, upstreams, and downstreams mean?

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 included here?

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

How can I access full ASN table data?

This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.