ASN AS4004 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS4004?

AS4004 is listed under Cogent Communications, 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.

AS4004 Cogent Communications, LLC

ASN Lookup Tool

Cogent Communications, LLC cogentco.com

US 1 Routes

AS Data

AS4004

AS4004 – Cogent Communications, LLC

AS Number	4004
AS Name	COGENT-4000
Organization	Cogent Communications, LLC(cogc)
Country	US
Website	cogentco.com
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	ISP
Registry	ARIN
Date Allocated	1994-11-04

ASN Intelligence API for production workflows

Use ASN data for AS4004 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
57.66.70.0/24	AS4004	Cogent Communications, LLC	Orange Business Services	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:       4000 - 4005
ASName:         COGENT-4000
ASHandle:       AS4000
RegDate:        1994-11-04
Updated:        2025-12-23    
Ref:            https://rdap.arin.net/registry/autnum/4000



OrgName:        Cogent Communications, LLC
OrgId:          COGC
Address:        2450 N Street NW
City:           Washington
StateProv:      DC
PostalCode:     20037
Country:        US
RegDate:        2000-05-30
Updated:        2025-09-23
Comment:        Geofeed https://geofeed.cogentco.com/geofeed.csv
Ref:            https://rdap.arin.net/registry/entity/COGC

ReferralServer:  rwhois://rwhois.cogentco.com:4321

OrgTechHandle: IPALL-ARIN
OrgTechName:   IP Allocation
OrgTechPhone:  +1-877-875-4311 
OrgTechEmail:  ipalloc@cogentco.com
OrgTechRef:    https://rdap.arin.net/registry/entity/IPALL-ARIN

OrgAbuseHandle: COGEN-ARIN
OrgAbuseName:   Cogent Abuse
OrgAbusePhone:  +1-877-875-4311 
OrgAbuseEmail:  abuse@cogentco.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/COGEN-ARIN

OrgNOCHandle: ZC108-ARIN
OrgNOCName:   Cogent Communications
OrgNOCPhone:  +1-877-875-4311 
OrgNOCEmail:  noc@cogentco.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/ZC108-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
AS12552	GlobalConnect AB	SE
AS5511	Orange S.A.	FR
AS28792	Public Internet Ltd	GB
AS35266	EX Networks Limited	GB
AS60602	Inovare-Prim SRL	MD
AS38880	Micron21 Datacentre Pty Ltd	AU
AS327727	C Squared Limited	UG
AS14537	Continent 8 LLC	US
AS198150	SIACOM JSC	GE
AS45352	IP ServerOne Solutions Sdn Bhd	MY

Upstreams

AS Number	Description	Country
AS12552	GlobalConnect AB	SE
AS5511	Orange S.A.	FR
AS7195	EDGEUNO S.A.S	CO
AS64049	Reliance Jio Infocomm Pte Ltd Singapore	SG
AS39351	31173 Services AB	SE
AS6939	Hurricane Electric LLC	US
AS6204	ZET.NET IP Transit	RO
AS327727	C Squared Limited	UG
AS22356	Durand do Brasil Ltda	BR
AS8966	EMIRATES TELECOMMUNICATIONS GROUP COMPANY ETISALAT GROUP PJSC	AE