ASN AS19503 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS19503?

AS19503 is listed under Magnetar Capital LLC.

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.

AS19503 Magnetar Capital LLC | IPGeolocation.io

ASN Lookup Tool

Magnetar Capital LLC magnetar.com

US 2 Routes

AS Data

AS19503

AS19503 – Magnetar Capital LLC

AS Number	19503
AS Name	NYMAGDIA-LT-CL
Organization	Magnetar Capital LLC(mcl-86)
Country	US
Website	magnetar.com
Number of IPv4 Routes	1
Number of IPv6 Routes	1
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2007-09-19

ASN Intelligence API for production workflows

Use ASN data for AS19503 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2620:7d:3::/48	AS19503	Magnetar Capital LLC	Magnetar Capital LLC	~1×10²⁴
74.113.149.0/24	AS19503	Magnetar Capital LLC	Magnetar Capital LLC	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:       19503
ASName:         NYMAGDIA-LT-CL
ASHandle:       AS19503
RegDate:        2007-09-19
Updated:        2019-08-01    
Ref:            https://rdap.arin.net/registry/autnum/19503


OrgName:        Magnetar Capital LLC
OrgId:          MCL-86
Address:        1603 Orrington Ave.
Address:        Ste 1300
City:           Evanston
StateProv:      IL
PostalCode:     60201
Country:        US
RegDate:        2005-10-13
Updated:        2014-02-03
Ref:            https://rdap.arin.net/registry/entity/MCL-86


OrgTechHandle: NETWO1015-ARIN
OrgTechName:   Network Admininstrator
OrgTechPhone:  +1-847-905-4677 
OrgTechEmail:  networks@magnetar.com
OrgTechRef:    https://rdap.arin.net/registry/entity/NETWO1015-ARIN

OrgAbuseHandle: NETWO1015-ARIN
OrgAbuseName:   Network Admininstrator
OrgAbusePhone:  +1-847-905-4677 
OrgAbuseEmail:  networks@magnetar.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NETWO1015-ARIN

RTechHandle: NETWO1015-ARIN
RTechName:   Network Admininstrator
RTechPhone:  +1-847-905-4677 
RTechEmail:  networks@magnetar.com
RTechRef:    https://rdap.arin.net/registry/entity/NETWO1015-ARIN

RNOCHandle: NOC31711-ARIN
RNOCName:   Noc
RNOCPhone:  +1-847-905-4677 
RNOCEmail:  networks@magnetar.com
RNOCRef:    https://rdap.arin.net/registry/entity/NOC31711-ARIN

RAbuseHandle: ABUSE4604-ARIN
RAbuseName:   Abuse
RAbusePhone:  +1-847-905-4677 
RAbuseEmail:  networks@magnetar.com
RAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE4604-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
AS46887	Crown Castle Fiber LLC	US
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS46887	Crown Castle Fiber LLC	US
AS3356	Level 3 Parent, LLC	US