ASN AS23503 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS23503?

AS23503 is listed under Exelon 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.

AS23503 Exelon Corporation | IPGeolocation.io

ASN Lookup Tool

Exelon Corporation exeloncorp.com

US 14 Routes

AS Data

AS23503

AS23503 – Exelon Corporation

AS Number	23503
AS Name	CONSTELLATION-ENERGY
Organization	Exelon Corporation(exelo)
Country	US
Website	exeloncorp.com
Number of IPv4 Routes	14
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2002-03-29

ASN Intelligence API for production workflows

Use ASN data for AS23503 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
216.99.185.0/24	AS23503	Exelon Corporation	Exelon Corporation	256
216.99.179.0/24	AS23503	Exelon Corporation	Exelon Corporation	256
216.99.176.0/23	AS23503	Exelon Corporation	Exelon Corporation	512
216.99.180.0/24	AS23503	Exelon Corporation	Exelon Corporation	256
216.99.183.0/24	AS23503	Exelon Corporation	Exelon Corporation	256
216.99.176.0/20	AS23503	Exelon Corporation	Exelon Corporation	4096
216.99.191.0/24	AS23503	Exelon Corporation	Exelon Corporation	256
216.99.187.0/24	AS23503	Exelon Corporation	Exelon Corporation	256
216.99.189.0/24	AS23503	Exelon Corporation	Exelon Corporation	256
216.99.186.0/24	AS23503	Exelon Corporation	Exelon 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:       23503
ASName:         CONSTELLATION-ENERGY
ASHandle:       AS23503
RegDate:        2002-03-29
Updated:        2016-08-08    
Ref:            https://rdap.arin.net/registry/autnum/23503


OrgName:        Exelon Corporation
OrgId:          EXELO
Address:        10 S Dearborn St
City:           Chicago
StateProv:      IL
PostalCode:     60603
Country:        US
RegDate:        2002-09-12
Updated:        2019-02-26
Ref:            https://rdap.arin.net/registry/entity/EXELO


OrgAbuseHandle: NOC1756-ARIN
OrgAbuseName:   Network Operations Center
OrgAbusePhone:  +1-410-470-1200 
OrgAbuseEmail:  netadmin2@exeloncorp.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NOC1756-ARIN

OrgNOCHandle: NOC1756-ARIN
OrgNOCName:   Network Operations Center
OrgNOCPhone:  +1-410-470-1200 
OrgNOCEmail:  netadmin2@exeloncorp.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/NOC1756-ARIN

OrgTechHandle: NOC1756-ARIN
OrgTechName:   Network Operations Center
OrgTechPhone:  +1-410-470-1200 
OrgTechEmail:  netadmin2@exeloncorp.com
OrgTechRef:    https://rdap.arin.net/registry/entity/NOC1756-ARIN

RAbuseHandle: NOC1756-ARIN
RAbuseName:   Network Operations Center
RAbusePhone:  +1-410-470-1200 
RAbuseEmail:  netadmin2@exeloncorp.com
RAbuseRef:    https://rdap.arin.net/registry/entity/NOC1756-ARIN

RTechHandle: NOC1756-ARIN
RTechName:   Network Operations Center
RTechPhone:  +1-410-470-1200 
RTechEmail:  netadmin2@exeloncorp.com
RTechRef:    https://rdap.arin.net/registry/entity/NOC1756-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
AS26425	Exelon Corporation	US
AS202	Level 3 Parent, LLC	US
AS1321	Verizon Business	US

Upstreams

AS Number	Description	Country
AS26425	Exelon Corporation	US
AS202	Level 3 Parent, LLC	US
AS1321	Verizon Business	US

Downstreams

AS Number	Description	Country
AS26425	Exelon Corporation	US