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ASN LANDING PAGE

AS4004

COGENT-4000 - Cogent Communications, LLC

Last updated · Jul 20, 2026

Country

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Total prefixes

0

IPv4 prefixes

0

IPv6 prefixes

0

ASN summary

How to read the scale of AS4004

COGENT-4000 - Cogent Communications, LLC currently reports 0 prefixes and 41 upstream, downstream, or peer relationships. These counts describe the current dataset; they do not by themselves prove network quality, reach, or service use.

What can an ASN page answer?

An ASN page shows the public organization label, country or region, BGP prefixes, and available peer and upstream relationships. It adds network context but cannot confirm a website host, physical facility, security status, or service quality.

How should you read the organization and region fields?

COGENT-4000 - Cogent Communications, LLC is currently associated with an unknown region. These values come from public network sources and are useful lookup clues; an organization label, registration region, and actual service location may differ.

How should you verify the AS4004 result?

The page shows ASN data returned by the current upstream query; interpret it with the update time. Open representative IP pages from the same network and compare prefixes, source labels, and query times. Verify operator or service claims with the relevant registry or network operator.

How to verify this ASN result

AS4004 ASN lookupAS4004 BGPAS4004 peersAS4004 prefixesAS4004 upstreamsCOGENT-4000 - Cogent Communications, LLC ASN

Upstreams

Detailed data for this ASN is not available right now.

Peers

AS5511

AS5511

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AS6939

AS6939

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AS6461

AS6461

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AS33891

AS33891

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AS9002

AS9002

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AS3491

AS3491

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AS8220

AS8220

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AS37468

AS37468

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AS25091

AS25091

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AS5405

AS5405

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AS34549

AS34549

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AS35280

AS35280

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AS3216

AS3216

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AS12779

AS12779

—

AS20562

AS20562

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AS29075

AS29075

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AS34927

AS34927

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AS50304

AS50304

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AS137409

AS137409

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AS3214

AS3214

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AS4455

AS4455

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AS6057

AS6057

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AS6667

AS6667

—

AS7195

AS7195

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AS8359

AS8359

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AS8426

AS8426

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AS8966

AS8966

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AS12552

AS12552

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AS14840

AS14840

—

AS15412

AS15412

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AS20764

AS20764

—

AS34177

AS34177

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AS37100

AS37100

—

AS37497

AS37497

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AS39351

AS39351

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AS41327

AS41327

—

AS42708

AS42708

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AS48185

AS48185

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AS48362

AS48362

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AS49544

AS49544

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Prefix inventory

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Related lookups and next steps

Frequently asked questions about this ASN page

What does AS4004 represent?

AS4004 is an autonomous system number. The current source associates it with COGENT-4000 - Cogent Communications, LLC and the region field an unknown region; those values add network context but do not prove a specific service, physical location, or quality level.

What are peers, upstreams, and prefixes useful for on the AS4004 page?

They help explain the scale, interconnection depth, and route structure of AS4004. Richer peering and upstream data often indicate broader network reach, but they should still be interpreted together with prefixes and related IP landing pages.

What should you do after reviewing AS4004?

Open a concrete IP page to check how the address maps into AS4004, then compare the prefix, source labels, and query time. Verify operator or service claims with the relevant registry or network operator.

Related topics

BGP and ASN Basics Guide

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Routing Troubleshooting and Network Analysis

Build troubleshooting context from an IP, BGP prefix, ASN, and public network relationships without treating static route data as a packet path.

Cloud Network and ASN Comparison

Compare representative cloud and edge networks by ASN, announced prefixes, peers, upstreams, and downstreams without inferring a specific host or customer workload.