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AS5603Telekom Slovenije, d.d.

SloveniaRegistryRIPE NCCTypeEyeball

As of 27th September 2026, AS5603 (Telekom Slovenije, d.d.), an access network registered in Slovenia with RIPE NCC, originates 81 IPv4 prefixes covering 1.8M addresses and 12 IPv6 prefixes. By IPv4 address space that makes it the 301st-largest of the 79,536 networks we see originating IPv4, and the largest of 262 in Slovenia. It is seen behind 42 upstream networks, most often AS5405 (Inter.link GmbH) and AS3356 (Lumen (Level 3)), and in front of 125 downstream networks. 99% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 96% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

81

IPv6 prefixes

12

IPv4 addresses

1.8M

IPv6 /64s

107B

Upstream graph

The networks AS5603 is seen behind, one and two hops out, drawn from real AS paths.

AS5603Toward the internet core
Upstream graph for AS5603: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS5603Telekom Slovenije…This networkAS3320Deutsche Telekom …AS3356Lumen (Level 3)AS5405Inter.link GmbHAS9002RETN LimitedAS13030Init7 (Switzerlan…AS37271Workonline Commun…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS3491PCCW Global (HK) …AS13237euNetworks GmbHAS6453TATA Communicatio…AS51907Kanton Zug

Networks observed one and two hops upstream of AS5603 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

466

adjacent networks

Upstreams
429%
Peers
29964%
Downstreams
12527%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 42.

Upstreams of AS5603
NetworkCountryRelationshipPathsVantage pts
AS5405Inter.link GmbHDEPeer7,04893
AS3356Lumen (Level 3)USPeer6,76281
AS9002RETN LimitedGBPeer4,38030
AS3320Deutsche Telekom AGDEPeer1,95240
AS13030Init7 (Switzerland) Ltd.CHPeer7744
AS7713PT Telkom Indonesia TbkIDPeer4943
AS6939Hurricane Electric LLCUSPeer46714
AS38880Micron21 Datacentre Pty LtdAUPeer3912
AS34288Kantonsschule ZugCHPeer3412
AS49544i3D.net B.VNLPeer3332

Prefixes

All 93

The largest blocks AS5603 originates, widest first.

Largest prefixes originated by AS5603
PrefixAddressesVisibility
188.196.0.0/14262k82/82
188.196.0.0/15131k82/82
188.198.0.0/15131k82/82
89.142.0.0/1665.5k82/82
89.143.0.0/1665.5k82/82
109.182.0.0/1665.5k82/82
178.58.0.0/1665.5k82/82
188.196.0.0/1665.5k39/82
188.197.0.0/1665.5k39/82
188.198.0.0/1665.5k39/82

Routing health

How AS5603's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid98.9%92
  • Invalid0.0%0
  • No ROA1.1%1

Propagation

  • Globally propagated90% of full-feed peers or more95.7%89
  • Partially propagated40% to 90%4.3%4
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 81 prefixes

IPv6 — 12 prefixes

  • /2934.4B × /6416.7%2
  • /324.3B × /6475.0%9
  • /4865.5k × /648.3%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Withdrawn178.58.128.0/1721st Sept 2026

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.