ASN Lookup Tool

Cogent Communications, LLC cogentco.com US US 0 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 0
Number of IPv6 Routes 0
ASN type ISP
Registry ARIN
Date Allocated 1994-11-04

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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

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

OrgTechHandle: IPALL-ARIN
OrgTechName:   IP Allocation
OrgTechPhone:  +1-877-875-4311 
OrgTechEmail:  ipalloc@cogentco.com
OrgTechRef:    https://rdap.arin.net/registry/entity/IPALL-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
AS51907 Kanton Zug CH
AS35266 EX Networks Limited GB
AS60602 Inovare-Prim SRL MD
AS38880 Micron21 Datacentre Pty Ltd AU
AS14537 Continent 8 LLC US
AS198150 SIACOM JSC GE
AS45352 IP ServerOne Solutions Sdn Bhd MY
AS31500 Global Network Management Inc AG
AS4657 StarHub Ltd SG
AS37468 Angola Cables AO
AS47957 Worldline IGSA SA FR
AS199524 G-Core Labs S.A. LU
AS34288 Kantonsschule Zug CH
AS37497 Network Platforms PTY LTD ZA
AS6461 Zayo Bandwidth US
AS209768 white2net Srl BE
AS206735 Novelcomm LP GR
AS58453 China Mobile International Limited HK
AS398465 Rackdog, LLC US
AS3216 PJSC "Vimpelcom" RU
AS13237 euNetworks GmbH DE
AS14840 BR.Digital Telecom BR
AS15412 Flag Telecom UK Limited GB
AS32590 Valve Corporation US
AS12735 TurkNet Iletisim Hizmetleri A.S. TR
AS8801 Rocket Fibre Ltd GB
AS61568 ALOO TELECOM - FSF TECNOLOGIA SA BR
AS42473 ANEXIA Internetdienstleistungs GmbH AT
AS1031 PEER 1031 LLC US
AS15412 Global Cloud Xchange GB
AS1828 Unitas Global US
AS262355 VSX Networks BR
AS999 CORIX NETWORKS US
AS4849 S3 Company Ltd BG
AS37497 Network Platforms (PTY) LTD ZA
AS8426 Claranet Limited GB
AS38158 PT. Cyberindo Aditama ID
AS37282 Main one Cable Company Nigeria Limited NG
AS5413 Wavenet Limited GB
AS36932 Internet Exchange Point of Nigeria NG
AS21215 UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd RS
AS202076 Fibre Networks (Scotland) Limited GB
AS263152 MIGO TELECOM BR
AS12741 Netia SA PL
AS45701 PT. Internet Madju Abad Milenindo ID
AS6667 Elisa Oyj FI
AS7713 Telekomunikasi Indonesia PT ID
AS34428 Giulio Lo Presti IT
AS14630 Invesco Group Services, Inc. US
AS2119 Telenor Norge AS NO
AS60171 AFR-IX TELECOM S.A. ES
AS34177 Celeste SAS FR
AS31742 Sota Solutions Ltd. GB
AS37680 Cool Ideas Service Provider Pty Ltd ZA
AS52025 ParadoxNetworks Limited GB
AS41073 Raidio Teilifis Eireann IE
AS204208 Peravix Group LTD GB

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
AS8359 MTS PJSC RU
AS22356 Durand do Brasil Ltda BR
AS8966 EMIRATES TELECOMMUNICATIONS GROUP COMPANY ETISALAT GROUP PJSC AE
AS17557 Pakistan Telecommunication Company Limited PK
AS31500 Global Network Management Inc AG
AS56911 Warian S.R.L. IT
AS37468 Angola Cables AO
AS8714 For use with the LINX Route Servers GB
AS20764 CJSC RASCOM RU
AS15802 Emirates Integrated Telecommunications Company PJSC AE
AS37497 Network Platforms PTY LTD ZA
AS6461 Zayo Bandwidth US
AS3216 PJSC Vimpelcom RU
AS58453 China Mobile International Limited HK
AS8220 COLT Technology Services Group Limited GB
AS14840 BR.Digital Telecom BR
AS12735 TurkNet Iletisim Hizmetleri A.S. TR
AS12779 IT.Gate S.p.A. IT
AS1031 PEER 1031 LLC US
AS15412 Global Cloud Xchange GB
AS30844 Liquid Telecommunications Ltd GB
AS37282 Main one Cable Company Nigeria Limited NG
AS34549 meerfarbig GmbH & Co. KG DE
AS21215 UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd RS
AS34927 iFog GmbH CH
AS25091 IP Max SA CH
AS42708 Glesys AB SE
AS48362 Stadtwerke Feldkirch AT
AS7713 Telekomunikasi Indonesia PT ID
AS6663 Euroweb Romania S.R.L. RO
AS33891 Core Backbone GmbH DE
AS34177 Celeste SAS FR
AS60171 AFR IX TELECOM S.A. ES
AS4455 IX Reach Ltd GB
AS3491 PCCW Global HK Limited HK
AS37100 SEACOM Limited MU
AS39120 Convergenze S.p.A. IT
AS9002 RETN Limited GB
AS29075 IELO LIAZO SERVICES SAS FR
AS50304 Blix Solutions AS NO
AS6057 Administracion Nacional de Telecomunicaciones UY
AS1267 WIND TRE S.P.A. IT
AS5405 Inter.link GmbH DE
AS3214 xTom GmbH DE
AS41327 Fiber Telecom S.p.A. IT
AS3741 NTT DATA Inc, Infrastructure Solutions, CORE, MEA ZA
AS35280 F5 Networks SARL FR
AS20562 Broadband Hosting B.V. NL
AS9044 BSE Software GmbH CH
AS5713 SAIX NET ZA
AS215638 Cilix Limited GB
AS137409 GSL Networks Pty LTD AU

Downstreams

AS Number Description Country
AS51964 ORANGE BUSINESS SERVICES U.S. Inc. US

Contacts

Email Contacts

ipalloc@cogentco.com

Abuse Contacts

abuse@cogentco.com

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Frequently Asked Questions

ASN AS4004 is an Autonomous System Number used to identify a network for BGP internet routing.
AS4004 is listed under Cogent Communications, LLC.
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
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.