Autonomous System
AS4004 · Cogent Communications, LLC
Overview
RIPE RIS route collectors currently see no prefix originated by AS4004: as far as they can tell, the number is not announced on the Internet right now. In the paths the collectors record, it has 55 upstream neighbours (transit providers or peers) and 1 downstream neighbour (customers or networks it carries). Its most visible upstreams are Opentransit Orange S.A. (AS5511), Hurricane Electric LLC (AS6939), and Zayo Bandwidth (AS6461). AS4004 was assigned by ARIN, and its registration country is United States.
Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 17, 2026 at 3:46 AM UTC. This page is refreshed at most every 12 hours.
Go further
No IPv4 address of this network is known right now, so there is nothing to trace to.
Announced prefixes
IPv4 prefixes (none)
None currently seen.
IPv6 prefixes (none)
None currently seen.
Neighbours
Upstreams (transit or peers) (55)
| AS | Network | Visibility |
|---|---|---|
| AS5511 | Opentransit Orange S.A. | 366 |
| AS6939 | Hurricane Electric LLC | 81 |
| AS6461 | Zayo Bandwidth | 22 |
| AS9002 | RETN Limited | 13 |
| AS25091 | IP-Max SA | 11 |
| AS33891 | Core-Backbone GmbH | 11 |
| AS3491 | PCCW Global (HK) Ltd. | 8 |
| AS37468 | Angola Cables | 7 |
| AS5405 | Inter.link GmbH | 6 |
| AS8220 | COLT Technology Services Group Limited | 6 |
| AS34549 | meerfarbig GmbH & Co. KG | 5 |
| AS35280 | F5 Networks SARL | 5 |
| AS3216 | PJSC "Vimpelcom" | 3 |
| AS7195 | EDGEUNO S.A.S | 3 |
| AS12779 | IT.Gate S.p.A. | 3 |
| AS20562 | Broadband Hosting B.V. | 3 |
| AS34927 | iFog GmbH | 3 |
| AS3214 | xTom GmbH | 2 |
| AS4455 | IX Reach Ltd | 2 |
| AS8966 | EMIRATES TELECOMMUNICATIONS GROUP COMPANY (ETISALAT GROUP) PJSC | 2 |
| AS12552 | GlobalConnect AB | 2 |
| AS14840 | BR.Digital Telecom | 2 |
| AS15412 | Flag Telecom UK Limited | 2 |
| AS29075 | IELO-LIAZO SERVICES SAS | 2 |
| AS34177 | Celeste SAS | 2 |
| AS37100 | SEACOM Limited | 2 |
| AS37497 | - | 2 |
| AS41327 | Fiber Telecom S.p.A. | 2 |
| AS42708 | - | 2 |
| AS48362 | Stadtwerke Feldkirch | 2 |
The 30 most visible of 55.
Downstreams (customers) (1)
| AS | Network | Visibility |
|---|---|---|
| AS51964 | ORANGE BUSINESS SERVICES U.S. Inc. | 650 |
38 more neighbours appear on both sides of this network depending on the path, so they are counted in neither list.
Visibility is RIPEstat's count of how often the route collectors observed the link. It compares neighbours with each other; it is not a traffic volume.
How to read this page
An Autonomous System (AS) is a network run under one routing policy: an internet provider, a cloud, a content network, a university. Each one has a number, its ASN, assigned by a regional registry (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC), and uses BGP, the protocol networks use to tell each other where addresses are, to announce the blocks of addresses it delivers to.
A prefix such as 203.0.113.0/24 is a block of addresses: the number after the slash says how many bits are fixed, so a /24 holds 256 IPv4 addresses and a /16 holds 65,536. Networks often announce a large block and smaller pieces of it at the same time, which is why the address total counts each address once.
Neighbours come from the paths themselves. A network that appears just before this one in a path, on the collector's side, is an upstream: a transit provider or a peer. One that appears just after it is a downstream, usually a customer. Peering at an internet exchange also shows up as an upstream, so the upstream list is not a list of paid transit.
The data comes from RIPEstat, run by the RIPE NCC, which gathers the routing tables of hundreds of networks through its RIS route collectors. This page reads it when it is visited and keeps it for 12 hours at most; the BGP viewer reads it live.