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Autonomous System

AS5603 · Telekom Slovenije, d.d.

Overview

AS5603 is announced on the Internet: RIPE RIS route collectors currently see 83 IPv4 prefixes and 12 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 785,152 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 79 upstream neighbours (transit providers or peers) and 130 downstream neighbours (customers or networks it carries). Its most visible upstreams are Inter.link GmbH (AS5405), Level 3 Parent, LLC (AS3356), and RETN Limited (AS9002). AS5603 was assigned by RIPE NCC, and its registration country is Slovenia.

Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 16, 2026 at 11:52 PM UTC. This page is refreshed at most every 12 hours.

Go further

Trace a route to this networkOpen in the BGP viewerWHOIS of 188.196.0.1

The trace goes to 188.196.0.1, the first address of 188.196.0.0/14. 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 (83 prefixes)

PrefixAddresses
37.18.224.0/204,096
37.18.224.0/221,024
37.18.228.0/23512
37.18.230.0/23512
37.18.232.0/212,048
86.61.0.0/1732,768
86.61.0.0/1816,384
86.61.64.0/1816,384
89.142.0.0/1665,536
89.142.0.0/1816,384
89.142.64.0/1816,384
89.142.128.0/1816,384
89.142.192.0/1816,384
89.143.0.0/1665,536
89.143.0.0/1816,384
89.143.64.0/1816,384
89.143.128.0/1816,384
89.143.192.0/1816,384
91.195.146.0/23512
91.217.126.0/24256
91.217.127.0/24256
95.159.192.0/1816,384
95.159.192.0/204,096
95.176.128.0/1732,768
95.176.128.0/1816,384
95.176.192.0/1816,384
109.182.0.0/1665,536
109.182.0.0/1732,768
109.182.128.0/1732,768
149.126.128.0/198,192
149.126.128.0/204,096
149.126.144.0/204,096
178.58.0.0/1665,536
178.58.0.0/1732,768
178.58.128.0/1732,768
185.46.140.0/24256
185.57.226.0/23512
185.58.180.0/221,024
185.58.180.0/23512
185.58.182.0/23512
185.59.24.0/221,024
185.59.24.0/23512
185.59.26.0/23512
188.196.0.0/14262,144
188.196.0.0/15131,072
188.196.0.0/1665,536
188.197.0.0/1665,536
188.198.0.0/15131,072
188.198.0.0/1665,536
188.199.0.0/1665,536
193.77.0.0/1665,536
193.77.0.0/1816,384
193.77.64.0/1816,384
193.77.128.0/1816,384
193.77.192.0/1816,384
193.95.192.0/1816,384
193.95.192.0/198,192
193.95.224.0/198,192
193.138.9.0/24256
193.189.160.0/198,192
193.189.160.0/204,096
193.189.176.0/204,096
194.165.96.0/198,192
194.165.96.0/204,096
195.5.164.0/24256
195.88.82.0/23512
195.210.192.0/1816,384
195.210.192.0/204,096
195.250.192.0/204,096
195.250.192.0/212,048
195.250.200.0/212,048
195.250.208.0/212,048
195.250.212.0/221,024
212.30.64.0/198,192
212.30.64.0/204,096
212.30.80.0/204,096
213.229.192.0/1816,384
213.229.192.0/198,192
213.229.192.0/204,096
213.229.224.0/198,192
213.250.0.0/1816,384
213.250.0.0/198,192
213.250.32.0/198,192

IPv6 prefixes (12 prefixes)

Prefix
2001:67c:20d8::/48
2a00:ee0::/29
2a00:ee0::/32
2a00:ee1::/32
2a00:ee2::/32
2a00:ee3::/32
2a00:ee4::/32
2a00:ee5::/32
2a00:ee6::/32
2a00:ee7::/32
2a02:e20::/29
2a02:e20::/32

Neighbours

Upstreams (transit or peers) (79)

ASNetworkVisibility
AS5405Inter.link GmbH17,258
AS3356Level 3 Parent, LLC4,351
AS9002RETN Limited3,809
AS3320Deutsche Telekom AG1,291
AS6939Hurricane Electric LLC1,227
AS6762TELECOM ITALIA SPARKLE S.p.A.372
AS13030Init7 (Switzerland) Ltd.209
AS48362Stadtwerke Feldkirch175
AS3303Swisscom (Schweiz) AG156
AS8218Zayo Infrastructure France SA136
AS14840BR.Digital Telecom124
AS34549meerfarbig GmbH & Co. KG117
AS47147Anexia Cloud Solutions GmbH111
AS34547-107
AS25467-94
AS8220COLT Technology Services Group Limited93
AS6204INTERKVM HOST SRL92
AS34019Hivane Association87
AS20485Joint Stock Company TransTeleCom84
AS43061Stelkom d.o.o.80
AS41327Fiber Telecom S.p.A.77
AS25091IP-Max SA76
AS34177Celeste SAS76
AS34927iFog GmbH71
AS8298IPng Networks GmbH69
AS3935131173 Services AB68
AS33891Core-Backbone GmbH65
AS15958CETIN Ltd. Belgrade61
AS35280F5 Networks SARL61
AS29691Nine Internet Solutions AG57

The 30 most visible of 79.

Downstreams (customers) (130)

ASNetworkVisibility
AS21246IPKO Telecommunications LLC2,342
AS198279Albanian Telecommunications Union SH. P.K.1,976
AS34772NEOTEL AD Skopje1,762
AS34547TELESMART TELEKOM DOO1,596
AS200899INTERSPACE DOOEL Skopje1,088
AS21107Blicnet d.o.o. Banja Luka555
AS205923Optixcom sh.p.k.546
AS6764PERFTECH, podjetje za proizvodnjo in uvajanje novih tehnologij, d.o.o.395
AS41104PODRAVKA trgovsko podjetje, d.o.o. Ljubljana375
AS28933University of Ljubljana, Faculty of Electrical Engineering364
AS57532-360
AS207746-346
AS197663POLANS, telekomunikacijske storitve d.o.o.336
AS44632-311
AS212548-307
AS43351-303
AS43854-285
AS24629-283
AS42681-283
AS214499-281
AS8307-278
AS25173-276
AS57554-274
AS8727-273
AS31134-273
AS44730-273
AS47903-273
AS48222-273
AS48653-273
AS58046-273

The 30 most visible of 130.

64 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.