Autonomous System

AS20811 · Retelit Digital Services S.p.A.

Overview

AS20811 is announced on the Internet: RIPE RIS route collectors currently see 14 IPv4 prefixes and 2 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 68,096 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 14 upstream neighbours (transit providers or peers) and 13 downstream neighbours (customers or networks it carries). Its most visible upstreams are Retelit Digital Services S.p.A. (AS28716), Hurricane Electric LLC (AS6939), and RETN Limited (AS9002). AS20811 was assigned by RIPE NCC, and its registration country is Italy.

Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 17, 2026 at 3:53 AM UTC. This page is refreshed at most every 12 hours.

Go further

Trace a route to this network Open in the BGP viewer WHOIS of 37.186.128.1

The trace goes to 37.186.128.1, the first address of 37.186.128.0/18. 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 (14 prefixes)

Prefix	Addresses
37.186.128.0/18	16,384
46.234.224.0/19	8,192
77.74.112.0/21	2,048
84.18.128.0/19	8,192
84.18.147.0/24	256
89.190.160.0/19	8,192
93.89.48.0/20	4,096
95.171.32.0/19	8,192
109.69.248.0/21	2,048
147.189.208.0/24	256
147.189.209.0/24	256
185.6.192.0/22	1,024
185.111.144.0/22	1,024
217.199.0.0/19	8,192

IPv6 prefixes (2 prefixes)

Prefix
2a02:490::/29
2a02:54c0::/29

Neighbours

Upstreams (transit or peers) (14)

AS	Network	Visibility
AS28716	Retelit Digital Services S.p.A.	104,499
AS6939	Hurricane Electric LLC	42,070
AS9002	RETN Limited	12,260
AS3303	Swisscom (Schweiz) AG	382
AS13030	Init7 (Switzerland) Ltd.	296
AS24961	WIIT AG	166
AS216265	ARISTO NETWORKS LTD	48
AS48362	Stadtwerke Feldkirch	38
AS22356	Durand do Brasil Ltda	35
AS9009	M247 Europe SRL	23
AS14840	BR.Digital Telecom	19
AS31543	myNet GmbH	18
AS263444	Open X Tecnologia Ltda	9
AS9498	BHARTI Airtel Ltd.	8

Downstreams (customers) (13)

AS	Network	Visibility
AS213123	ALPERIA SPA	519
AS59419	Sidera ICTease S.r.l.	396
AS51344	IDM Suedtirol Alto Adige	391
AS207146	Netikom SRL	375
AS49265	csgalileo Cooperativa Sociale Galileo A.r.l.	296
AS56346	Leitner S.P.A.	261
AS211723	Peter Pohl	235
AS31067	SEAC S.p.A.	179
AS44241	Infranet S.p.A.	36
AS50178	Limitis s.r.l.	36
AS57469	-	7
AS205099	-	5
AS12654	-	1

149 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.