ASN AS53521 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS53521?

AS53521 is listed under Complete Discovery Source.

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.

AS53521 Complete Discovery Source

ASN Lookup Tool

Complete Discovery Source cdslegal.com

US 2 Routes

AS Data

AS53521

AS53521 – Complete Discovery Source

AS Number	53521
AS Name	CDS-200
Organization	Complete Discovery Source(cds-200)
Country	US
Website	cdslegal.com
Number of IPv4 Routes	2
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2013-10-08

ASN Intelligence API for production workflows

Use ASN data for AS53521 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
38.125.93.0/24	AS53521	Complete Discovery Source	Complete Discovery Source, Inc.	256
154.60.112.0/24	AS53521	Complete Discovery Source	Cogent Communications, 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:       53521
ASName:         CDS-200
ASHandle:       AS53521
RegDate:        2013-10-08
Updated:        2013-10-08    
Ref:            https://rdap.arin.net/registry/autnum/53521


OrgName:        Complete Discovery Source
OrgId:          CDS-200
Address:        250 Park Avenue
Address:        18th Floor
City:           New York
StateProv:      NY
PostalCode:     10177
Country:        US
RegDate:        2010-05-17
Updated:        2025-03-06
Ref:            https://rdap.arin.net/registry/entity/CDS-200


OrgTechHandle: SYLVE40-ARIN
OrgTechName:   Sylvester, Thomas 
OrgTechPhone:  +1-386-627-4987 
OrgTechEmail:  tsylvester@cdslegal.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SYLVE40-ARIN

OrgAbuseHandle: ITDIR27-ARIN
OrgAbuseName:   IT Director
OrgAbusePhone:  +1-212-813-7064 
OrgAbuseEmail:  bsingh@cdslegal.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ITDIR27-ARIN

OrgTechHandle: SAWHR-ARIN
OrgTechName:   Sawh, Raul 
OrgTechPhone:  +1-646-709-4224 
OrgTechEmail:  rsawh@cdslegal.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SAWHR-ARIN

OrgNOCHandle: CDSLE1-ARIN
OrgNOCName:   CDSLegalARIN
OrgNOCPhone:  +1-212-813-7000 
OrgNOCEmail:  InformationTechnology@cdslegal.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/CDSLE1-ARIN

OrgTechHandle: ITDIR27-ARIN
OrgTechName:   IT Director
OrgTechPhone:  +1-212-813-7064 
OrgTechEmail:  bsingh@cdslegal.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ITDIR27-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
AS6461	Zayo Bandwidth	US
AS174	Cogent Communications, LLC	US

Upstreams

AS Number	Description	Country
AS6461	Zayo Bandwidth	US
AS174	Cogent Communications, LLC	US