ASN AS1239 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS1239?

AS1239 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.

AS1239 Cogent Communications, LLC

ASN Lookup Tool

Cogent Communications, LLC cogentco.com

US 0 Routes

AS Data

AS1239

AS1239 – Cogent Communications, LLC

AS Number	1239
AS Name	COGENT-1239
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	1991-03-25

ASN Intelligence API for production workflows

Use ASN data for AS1239 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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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:       1239
ASName:         COGENT-1239
ASHandle:       AS1239
RegDate:        1991-03-25
Updated:        2025-12-23
Ref:            https://rdap.arin.net/registry/autnum/1239



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

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

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "1239",
    "as_handle" : "AS1239",
    "as_name" : "COGENT-1239",
    "tech_contacts" : [ "IPALL-ARIN" ],
    "abuse_contacts" : [ "COGEN-ARIN" ],
    "date_created" : "1991-03-25",
    "date_updated" : "2025-12-23",
    "source" : "https://rdap.arin.net/registry/autnum/1239"
  } ],
  "organization" : {
    "handle" : "COGC",
    "name" : "Cogent Communications, LLC",
    "address" : [ "2450 N Street NW", "Washington", "DC", "20037", "US" ],
    "street" : "N Street Nw",
    "city" : "Washington",
    "state" : "DC",
    "zip_code" : "20037",
    "country" : [ "US" ],
    "date_created" : "2000-05-30",
    "date_updated" : "2025-09-23",
    "source" : "https://rdap.arin.net/registry/entity/COGC",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "IPALL-ARIN",
    "name" : "IP Allocation",
    "email" : [ "ipalloc@cogentco.com" ],
    "phone" : [ "+1-877-875-4311" ],
    "source" : "https://rdap.arin.net/registry/entity/IPALL-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "COGEN-ARIN",
    "name" : "Cogent Abuse",
    "email" : [ "abuse@cogentco.com" ],
    "phone" : [ "+1-877-875-4311" ],
    "source" : "https://rdap.arin.net/registry/entity/COGEN-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS15225	Perseco	US
AS3685	State University of New York at Buffalo	US
AS33069	BCI	US
AS18734	Operbes, S.A. de C.V.	MX
AS51007	Servicios Audiovisuales Overon S.L.	ES
AS201453	Nostravant S.L.L.	ES
AS8285	Versija SIA	LV
AS3132	Red Cientifica Peruana	PE
AS210627	Grayshott Gigabit Limited	GB
AS394459	QUANTA SERVICES INC	US
AS39634	Via.io SARL	FR
AS197415	CROSSCOMM R SARL	LU
AS268729	Wnett Fibra	BR
AS20652	Unitron Systems & Development LTD	GB
AS208354	Alfa.Bit.Omega S.R.L.	IT
AS40255	Brigade Capital Management, LP	US
AS59655	Exinity works (CY) LTD	CY
AS3252	Fiberax Networking&Cloud Ltd.	GB
AS40118	Third Point LLC	US
AS11140	Behr Process	US
AS892	Emergent Biosolutions	US
AS215691	AP INTERACTIVE SOLUTIONS SL	ES
AS25841	Fusionapps, LLC.	US
AS207234	Mobile Breitbandnetze GmbH	DE
AS198622	Adform A/S	DK
AS399337	Netcrawler Inc	CA
AS27281	Quantcast Corporation	US
AS210123	NUBBITEL TELECOM,S.L.	ES
AS47942	Regional Telecom Ltd	IE
AS396117	Orange County Fire Authority	US
AS132167	Nine Communications Company Limited	MM
AS19753	IANA - Autonomous System Number	US
AS209265	INFINITY LOOP SLU	AD
AS999	CORIX NETWORKS	US
AS327727	C-Squared Limited	UG
AS400696	MIBURA, INC.	US
AS52341	WOM S.A.	CL
AS12741	Netia SA	PL
AS11951	Medical Computer Systems	US
AS60157	Antheus Telecom Ltd	GB
AS22439	Perfect International, Inc	US
AS50297	Infium, UAB	LT
AS202321	Institut National de l'Audiovisuel	FR
AS202626	Perfect-net Jaroslaw Dziubek	PL
AS394187	IANA - Autonomous System Number	US
AS8681	JT (Jersey) Limited	JE
AS212109	Squirrel Internet Ltd	GB
AS27640	GIGAS HOSTING USA, LLC	US
AS63100	Carnegie Telephone Company, Inc.	US
AS9158	Telenor A/S	DK
AS58507	Wireline	AU
AS7992	Cogeco Connexion Inc.	CA
AS397290	Honda Federal Credit Union	US
AS11158	NTT America, Inc.	US
AS396002	TeleVoIPs	US
AS397530	SOFTEON, INC	US
AS33390	READYTECH CORPORATION	US
AS16622	Novarad Corporation	US
AS273245	TERAMEG SA DE CV	MX
AS36436	Infobunker, L.L.C.	US

Upstreams

AS Number	Description	Country
AS32097	WholeSale Internet, Inc.	US

Downstreams

AS Number	Description	Country
AS174	Cogent Communications, LLC	US

Contacts

Email Contacts

ipalloc@cogentco.com

Abuse Contacts

abuse@cogentco.com