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Autonomous System

AS210320 · Cedric Hoogendoorn

Overview

AS210320 is announced on the Internet: RIPE RIS route collectors currently see 2 IPv4 prefixes and 2 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 512 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 34 upstream neighbours (transit providers or peers) and 1 downstream neighbour (customers or networks it carries). Its most visible upstreams are Johannes Ernst (AS212895), Hurricane Electric LLC (AS6939), and Peter-Paul Maria Kurstjens (AS200132). AS210320 was assigned by RIPE NCC, and its registration country is Netherlands.

Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 16, 2026 at 11:01 PM UTC. This page is refreshed at most every 12 hours.

Go further

Trace a route to this networkOpen in the BGP viewerWHOIS of 151.241.10.1

The trace goes to 151.241.10.1, the first address of 151.241.10.0/24. An address picked inside a prefix may not answer (nothing listens there, or the network filters probes): the trace then shows the path up to the last network that replies.

Announced prefixes

IPv4 prefixes (2 prefixes)

PrefixAddresses
151.241.10.0/24256
157.173.79.0/24256

IPv6 prefixes (2 prefixes)

Prefix
2001:67c:d4::/48
2a0e:b107:18c0::/48

Neighbours

Upstreams (transit or peers) (34)

ASNetworkVisibility
AS212895Johannes Ernst325
AS6939Hurricane Electric LLC134
AS200132Peter-Paul Maria Kurstjens125
AS8283Netwerkvereniging Coloclue17
AS20485Joint Stock Company TransTeleCom4
AS5405Inter.link GmbH2
AS14840BR.Digital Telecom2
AS24961WIIT AG2
AS25091IP-Max SA2
AS29632Netassist International EOOD2
AS34177Celeste SAS2
AS37100SEACOM Limited2
AS37468Angola Cables2
AS37497Network Platforms (PTY) LTD2
AS3935131173 Services AB2
AS47147-2
AS48362Stadtwerke Feldkirch2
AS1031PEER 1031 LLC1
AS1764Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH1
AS4455IX Reach Ltd1
AS6663Euroweb Romania S.R.L.1
AS6696VERIXI SA1
AS6797GlobalConnect AB1
AS7713PT Telekomunikasi Indonesia1
AS9044BSE Software GmbH1
AS20326TeraSwitch Networks Inc.1
AS30844Liquid Telecommunications Ltd1
AS42708Glesys AB1
AS55850-1
AS58057Securebit AG1

The 30 most visible of 34.

Downstreams (customers) (1)

ASNetworkVisibility
AS197754Christiaan Goossens8

65 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.

Frequently asked questions

How do I find the ASN of an IP address?
Type the address in the BGP viewer: it shows the prefix that covers it, the AS that originates that prefix and the paths seen towards it. A traceroute also names the network of each hop, so you can see every AS a connection crosses.
Why does one company have several ASNs?
Large operators split their network by region, by activity or by history: a cloud may use one number for its backbone and another for a region, and every acquisition brings its own numbers. Each number has its own page, with its own prefixes and neighbours.
Why do prefix counts differ from one site to another?
Each source sees the routing table from different collectors, at a different time, and counts differently: some include prefixes withdrawn in recent weeks, some merge a block and its pieces. This page counts the prefixes RIPE RIS collectors see originated by the network at the end of the latest two-week window, and counts each IPv4 address once.
Is this the list of IP ranges of a cloud provider?
It is what its networks announce, which is what the Internet routes to them. Many providers also publish an official list of ranges per service and region; that list is the reference for firewall rules, because a range can be announced before it is used, or announced by another of their AS numbers.