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Autonomous System

AS1103 · SURF B.V.

Overview

AS1103 is announced on the Internet: RIPE RIS route collectors currently see 99 IPv4 prefixes and 4 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 7,200,000 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 70 upstream neighbours (transit providers or peers) and 469 downstream neighbours (customers or networks it carries). Its most visible upstreams are GTT Communications Inc. (AS3257), Hurricane Electric LLC (AS6939), and LibertyGlobal Liberty Global Europe Holding B.V. (AS6830). AS1103 was assigned by ARIN, and its registration country is Netherlands.

Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 17, 2026 at 3:18 AM UTC. This page is refreshed at most every 12 hours.

Go further

Trace a route to this networkOpen in the BGP viewerWHOIS of 145.144.0.1

The trace goes to 145.144.0.1, the first address of 145.144.0.0/12. 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 (99 prefixes)

PrefixAddresses
129.125.0.0/1665,536
130.37.0.0/1665,536
131.174.0.0/1665,536
131.211.0.0/1665,536
131.224.0.0/1665,536
132.229.0.0/1665,536
134.221.0.0/1665,536
136.231.0.0/1665,536
137.56.0.0/1665,536
137.120.0.0/1665,536
137.224.0.0/1665,536
139.63.0.0/1665,536
141.252.0.0/1665,536
143.121.0.0/1665,536
145.0.0.0/1665,536
145.1.0.0/1732,768
145.2.0.0/15131,072
145.5.0.0/1665,536
145.9.0.0/1665,536
145.19.0.0/1665,536
145.20.0.0/1665,536
145.23.0.0/1665,536
145.24.0.0/1665,536
145.28.0.0/15131,072
145.33.0.0/1665,536
145.37.0.0/1665,536
145.38.0.0/15131,072
145.41.0.0/1665,536
145.44.0.0/1665,536
145.48.0.0/15131,072
145.51.0.0/1665,536
145.52.0.0/1665,536
145.74.0.0/15131,072
145.76.0.0/1665,536
145.81.0.0/1665,536
145.85.0.0/1665,536
145.88.0.0/15131,072
145.90.0.0/1665,536
145.91.0.0/1665,536
145.92.0.0/15131,072
145.95.0.0/1665,536
145.96.0.0/1665,536
145.97.0.0/204,096
145.97.16.0/221,024
145.97.20.0/221,024
145.97.24.0/212,048
145.97.48.0/204,096
145.97.64.0/1816,384
145.97.128.0/1816,384
145.97.192.0/1816,384
145.98.0.0/1665,536
145.98.16.0/24256
145.100.0.0/15131,072
145.102.0.0/1665,536
145.103.0.0/1665,536
145.107.0.0/1665,536
145.107.24.0/221,024
145.108.0.0/1665,536
145.116.64.0/1816,384
145.116.128.0/1816,384
145.116.192.0/204,096
145.116.224.0/198,192
145.117.0.0/1665,536
145.118.0.0/1665,536
145.120.0.0/14262,144
145.124.0.0/15131,072
145.126.0.0/1665,536
145.127.0.0/1732,768
145.136.0.0/15131,072
145.137.128.0/1816,384
145.138.0.0/1665,536
145.140.0.0/14262,144
145.144.0.0/121,048,576
145.160.0.0/121,048,576
156.83.0.0/1665,536
192.16.188.0/23512
192.31.231.0/24256
192.33.36.0/24256
192.42.113.0/24256
192.42.114.0/23512
192.42.120.0/221,024
192.42.124.0/221,024
192.43.212.0/24256
192.87.0.0/1665,536
192.104.140.0/24256
193.176.235.0/24256
193.177.176.0/221,024
194.13.112.0/212,048
194.26.8.0/221,024
194.26.12.0/221,024
194.53.88.0/24256
194.53.89.0/24256
194.53.92.0/24256
194.53.94.0/24256
194.53.95.0/24256
194.104.124.0/23512
194.104.240.0/204,096
194.171.0.0/1665,536
195.169.0.0/1665,536

IPv6 prefixes (4 prefixes)

Prefix
2001:610::/29
2001:610:5ea::/48
2001:67c:1200::/48
2001:67c:262c::/48

Neighbours

Upstreams (transit or peers) (70)

ASNetworkVisibility
AS3257GTT Communications Inc.46,836
AS6939Hurricane Electric LLC21,280
AS6830LibertyGlobal Liberty Global Europe Holding B.V.13,996
AS20562Broadband Hosting B.V.8,578
AS2914NTT America, Inc.5,958
AS20965GEANT Vereniging5,164
AS9002RETN Limited5,038
AS7195EDGEUNO S.A.S4,050
AS24785Broadband Hosting B.V.3,015
AS22356Durand do Brasil Ltda2,148
AS37468Angola Cables1,753
AS11537-1,397
AS20485Joint Stock Company TransTeleCom1,274
AS8220COLT Technology Services Group Limited1,201
AS1031PEER 1031 LLC1,167
AS7473Singapore Telecommunications Ltd1,150
AS4230CLARO S.A.1,149
AS33891Core-Backbone GmbH938
AS5405Inter.link GmbH924
AS7713PT Telekomunikasi Indonesia655
AS37100SEACOM Limited630
AS3303Swisscom (Schweiz) AG434
AS30844Liquid Telecommunications Ltd426
AS6910-316
AS13030Init7 (Switzerland) Ltd.277
AS20764CJSC RASCOM247
AS35280F5 Networks SARL245
AS24961WIIT AG231
AS34927iFog GmbH228
AS1764-227

The 30 most visible of 70.

Downstreams (customers) (469)

ASNetworkVisibility
AS3257GTT Communications Inc.2,233
AS7195EDGEUNO S.A.S1,192
AS4230CLARO S.A.809
AS9498BHARTI Airtel Ltd.800
AS11537Internet2674
AS20562Broadband Hosting B.V.627
AS1031PEER 1031 LLC404
AS1101SURF B.V.399
AS271253LINK BRASIL TELECOMUNICACOES LTDA380
AS1152SURF B.V.378
AS4800PT Aplikanusa Lintasarta374
AS1102-369
AS1104-368
AS1145-366
AS215088-364
AS30844Liquid Telecommunications Ltd323
AS1133-303
AS7473Singapore Telecommunications Ltd292
AS28283Adylnet Telecom285
AS1124-276
AS288-273
AS1128-273
AS1161-272
AS1837-271
AS1888-271
AS42165-271
AS206130-271
AS1147-254
AS7049Silica Networks Argentina S.A.247
AS17557Pakistan Telecommunication Company Limited236

The 30 most visible of 469.

1,013 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.