Home ASN LookupAS5603

AS5603 SIOL-NET Telekom Slovenije, d.d.

🇸🇮

Org handle: ORG-SId2-RIPE

Telekom Slovenije d.d.

RIPE NCCallocated

Announced Prefixes (BGP)

95total

83 IPv412 IPv6

IPv4 Addresses

Allocated (RIR)920,320

Announced (BGP)1.8M

IPv6 Addresses

Allocated (RIR)1.3×10³⁰

Announced (BGP)1.9×10³⁰

Prefix Limit (IPv4)

1,000

Prefix Limit (IPv6)

Country

🇸🇮 SI

RIR

RIPE NCC

Status

allocated

Allocated

1996-04-19

Routing hygiene

Score 3/100 · Low risk

RPKI ROA coverage

97.9%

no RPKI invalid prefixes

IRR route objects

100%

no origin mismatches

Hijack signals

0 announced against others' ROAs, 0 own announced by others

Upstreams

diversity 81/100

No significant routing hygiene issues found

Based on 95 announced prefixes, updated daily (2026-10-20). How the score works · RPKI explained

Announced Prefixes

(BGP)95

Prefix	RPKI	IRR	Last Seen
37.18.224.0/20	Valid	RIPE	2026-10-27
37.18.224.0/22	Valid	RIPE	2026-10-27
37.18.228.0/23	Valid	RIPE	2026-10-27
37.18.230.0/23	Valid	RIPE	2026-10-27
37.18.232.0/21	Valid	RIPE	2026-10-27
86.61.0.0/17	Valid	RIPE	2026-10-27
86.61.0.0/18	Valid	RIPE	2026-10-27
86.61.64.0/18	Valid	RIPE	2026-10-27
89.142.0.0/16	Valid	RIPE	2026-10-27
89.142.0.0/18	Valid	RIPE	2026-10-27

1-10 of 95

1 / 10

Allocated Prefixes

(RIR)39

Prefix	Country	RIR	Status
37.18.224.0/20	🇸🇮 SI	RIPENCC	allocated
37.18.232.0/21	🇸🇮 SI	RIPE	assigned
86.61.0.0/17	🇸🇮 SI	RIPENCC	allocated
89.142.64.0/18	🇸🇮 SI	RIPE	assigned
89.143.64.0/18	🇸🇮 SI	RIPE	assigned
89.143.128.0/18	🇸🇮 SI	RIPE	assigned
91.195.146.0/23	🇸🇮 SI	RIPENCC	allocated
95.159.192.0/18	🇸🇮 SI	RIPENCC	allocated
95.176.128.0/17	🇸🇮 SI	RIPENCC	allocated
95.176.128.0/18	🇸🇮 SI	RIPE	assigned

1-10 of 39

1 / 4

All 95 announced prefixes of AS5603 →

Downstream Customers(3)

ASN	Name
AS44073	🇸🇮zdlj-net-as Zdravstveni Dom Ljubljana
AS202137	🇸🇮MORS Ministrstvo za obrambo
AS214499	🇸🇮BASS-2 BASS d.o.o., Celje

BGP Neighbours

(seen in AS paths)

Upstreams (7)

Networks AS5603 hands its own prefixes to: transit providers, or peers at an exchange.

AS9002RETN Limited26
AS6204ZET NET INTERKVM HOST20
AS3356Level 3 Parent18
AS33891CORE BACKBONE Core Backbone18
AS5405INTERDOTLINK Inter.Link11
AS3320DTAG Deutsche Telekom1
AS6939Hurricane Electric1

Downstreams (55)

Networks whose own prefixes AS5603 passes on: usually its customers.

AS34547Telesmart TELEKOM DOO26
AS21107BLICNET D.O.O. Banja Luka18
AS198279ATU AL Albanian Telecommunications Union SH. P.K18
AS21246IPKO Telecommunications12
AS197663POLANS POLANS, Telekomunikacijske Storitve D.O.O8
AS6764PERFTECH SLOVENIA PERFTECH, Podjetje Za Proizvodnjo In Uvajanje Novih Tehnologij, D.O.O6
AS34772NEOTEL MK NEOTEL AD Skopje5
AS24629NIL Data Communications3
AS25467AKTON D.O.O3
AS28933LTFE University Of Ljubljana, Faculty Of Electrical Engineering3
AS41104PODRAVKA Trgovsko Podjetje, D.O.O. Ljubljana2
AS56993KZPS KONTROLA ZRACNEGA PROMETA SLOVENIJE, D.O.O2
AS57532KTVRavne Kabelska Televizija Ravne D.O.O2
AS57554ZAVMB DD Zavarovalnica Sava, D.D2
AS205923OPTIXCOM Sh.P.K2
AS211256ELTA SI ELTA TELEKOMUNIKACIJE D.O.O2
AS8307TS Telekom Slovenije, D.D1
AS8727ADACTA BE Terna D.O.O1
AS15889SRC SI SRC Sistemske Integracije D.O.O1
AS20526INTEREUROPA D.D1
AS25499ASN TRIGLAV Zavarovalnica Triglav D.D1
AS29276MOBITEL GPRS Telekom Slovenije, D.D1
AS31134AMZS D.O.O1
AS33918PRIMORSKE NOVICE PRIMORSKE NOVICE, D.O.O. Koper,S.R.L. Capodistria1
AS34717SID Bank,D.D., Ljubljana1
AS41182MKNJIGA Mladinska Knjiga Zalozba, D.D1
AS41630HELIOS Domzale, D.O.O1
AS42681TS Telekom Slovenije, D.D1
AS42757SPARKASSE SI Banka Sparkasse D.D1
AS43351GORENJE SI Gorenje, D.O.O1
AS43854STUDIOMODERNA Studio Moderna D.O.O1
AS44073Zdlj Net Zdravstveni Dom Ljubljana1
AS44730VZAJEMNA SI Vzajemna Zdravstvena Zavarovalnica D.D1
AS44744FLINT SI D.O.O1
AS45002VOKA JAVNI HOLDING Ljubljana, D.O.O1
AS47903JUB D.O.O1
AS48222TRIGLAVZADRAVSTVENA SI ZAVAROVALNICA TRIGLAV, D.D1
AS48653SLO ZELEZNICE Slovenske Zeleznice, D.O.O1
AS49754SFERA IT Sfera IT D.O.O1
AS49927Mikrografija Trgovina D.O.O1
AS56481MLINOTEST Zivilska Industrija D.D1
AS58046HKOM The Ministry Of Digital Transformation1
AS197326TRIMO TRIMO, Arhitekturne Resitve, D.O.O1
AS198298IMOVATION D.O.O1
AS199268LANCOM SI LANCOM Inzeniring Racunalniskig Sistemov D.O.O1
AS199951KNET K NET, Kabelski Sistemi, D.O.O1
AS199971SI IXTLANTEAM Ixtlan Team D.O.O1
AS202137MORS Ministrstvo Za Obrambo1
AS202456SILIKO PROIZVODNO PODJETJE, STORITVE IN TRGOVINA, D.O.O1
AS202547LON Hranilnica LON D.D., Kranj1
AS202644Mewireless Wireless Montenegro D.O.O1
AS204500ARCONT D.D1
AS205403ELRAD INTERNATIONAL D.O.O1
AS205509Elektro Primorska Elektro Primorska, Podjetje Za Distribucijo Elektricne Energije, D.D1
AS207746A1SI A1 Slovenija Telekomunikacijske Storitve,D.D1

Other adjacent networks (9)

Adjacent to AS5603 in the transit part of AS paths: peers, providers or customers.

AS200899INTERSPACE EUROPE INTERSPACE DOOEL Skopje7
AS1853ACONET3
AS37468Angola Cables Angola Cables3
AS43061SI STELKOM D.O.O2
AS4230CLARO S.A1
AS6762SEABONE NET TELECOM ITALIA SPARKLE S.P.A1
AS15958CETIN Doo CETIN . Belgrade1
AS22356Durand Do Brasil Ltda1
AS34177CELESTE SAS1

ASPA

No ASPA0 upstreams, 3 downstreams

Listed as Upstream Provider by

3 ASNs

View full ASPA details →

Abuse Contact

+31205354444

External Links

RIPE Whois RIPEstat

Learn more

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
How to run an ASPA checkVerify the upstream providers listed above
IPv4 transfers in the RIPE NCC regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Open

GEThttps://api.ipctl.io/v1/asn/5603

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/5603" | jq