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.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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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

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
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
AS53766	Avago Technologies U.S. Inc.	US
AS29606	Borwood Ltd	GB
AS8285	Versija SIA	LV
AS50124	EASIO-COM SASU	FR
AS3132	Red Cientifica Peruana	PE

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