Skip to main content
WorldIP.io
Autonomous System

AS2603

NORDUnet

NORDUnet Denmark 🌐 nordu.net
Announced IPs
9,728
CIDR prefixes
9
ASN
AS2603

Reputation · trust score

A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.

59/100
Caution
How this score is built
  • Baseline (neutral) 65
  • Active-threat / abuse risk −12
  • Academic allocation +6
  • Trust score 59 / 100

Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →

About NORDUnet

NORDUnet is an international collaboration between the national research and education networks in the Nordic countries.

Founded
1985
Headquarters
Copenhagen
Official website ↗ Summary from Wikipedia, CC BY-SA 4.0 · Data from Wikidata

⚠ 1 MOAS prefix — multiple origin ASNs detected

All MOAS anomalies →

A previously stable prefix originated by AS2603 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.

PrefixOrigin ASNsLast detected (UTC)
193.10.255.0/24 AS2603, AS2832 2026-11-13 16:24:10

Network profile

Source: PeeringDB →
Network type Educational/Research
Traffic level 1-5Tbps
Geographic scope Global
Traffic ratio Balanced
Peering policy Selective
IRR record AS-NORDUNET

Present at 31 internet exchanges: RIX, Netnod Stockholm GREEN -- MTU1500: STH-A -- MTU1500, LINX LON1: Main, NIX1, NYIIX New York, DE-CIX Frankfurt: DE-CIX Frankfurt Peering LAN, Equinix Chicago, Equinix Ashburn, AMS-IX, NL-ix: Main, …

Website ↗ Looking glass ↗

Top CIDR ranges

CIDRIPsPTR DensityOrganizationCountryStateCity
109.105.96.0/20 4.1K
35.2%
NORDUnet DK — —
109.105.112.0/21 2.0K
13.2%
NORDUnet DK Capital Region Kastrup
109.105.120.0/22 1.0K
12.8%
NORDUnet DK — —
185.174.116.0/22 1.0K
63.7%
NORDUnet DK — —
109.105.106.0/23 512
31.4%
NORDUnet DK — —
109.105.116.0/23 512
25.6%
NORDUnet DK — —
109.105.122.0/23 512
7.8%
NORDUnet DK — —
193.10.254.0/23 512
21.1%
NORDUnet SE — —
109.105.100.0/24 256
13.7%
NORDUnet DK — —
109.105.103.0/24 256
2.3%
NORDUnet JP — —
109.105.104.0/24 256
54.3%
NORDUnet SE — —
109.105.105.0/24 256
0.0%
NORDUnet DK — —
109.105.108.0/24 256
20.3%
NORDUnet DK — —
109.105.110.0/24 256
48.4%
NORDUnet DK — —
109.105.111.0/24 256
35.5%
NORDUnet SE — —
109.105.112.0/24 256
2.0%
NORDUnet DK — —
109.105.115.0/24 256
2.0%
NORDUnet DK — —
109.105.118.0/24 256
9.0%
NORDUnet DK — —
109.105.120.0/24 256
3.9%
NORDUnet GB — —
192.36.171.0/24 256
49.2%
NORDUnet SE — —
193.10.252.0/24 256
28.9%
NORDUnet SE — —
193.10.254.0/24 256
17.2%
NORDUnet DK — —
193.10.255.0/24 256
25.0%
NORDUnet SE — —
193.11.3.0/24 256
20.7%
NORDUnet SE — —
194.68.13.0/24 256
25.0%
NORDUnet SE — —
109.105.101.128/25 128
35.2%
NORDUnet DK — —
109.105.109.128/25 128
12.5%
NORDUnet SE — —
109.105.113.128/25 128
10.9%
NORDUnet DK — —
109.105.114.128/25 128
3.9%
NORDUnet DK — —
109.105.119.0/25 128
27.3%
NORDUnet SE — —
109.105.121.128/25 128
32.0%
NORDUnet DK — —
193.10.252.128/25 128
28.9%
NORDUnet SE — —
109.105.96.192/26 64
45.3%
NORDUnet DK — —
109.105.102.192/26 64
48.4%
NORDUnet SE — —
109.105.109.0/26 64
12.5%
NORDUnet DK — —
109.105.109.64/26 64
12.5%
NORDUnet DE — —
109.105.113.0/26 64
10.9%
NORDUnet SE — —
109.105.113.64/26 64
10.9%
NORDUnet DK — —
109.105.114.64/26 64
4.7%
NORDUnet DK — —
109.105.119.128/26 64
28.1%
NORDUnet DK — —
109.105.121.64/26 64
31.3%
NORDUnet DK — —
193.10.252.64/26 64
29.7%
NORDUnet SE — —
109.105.98.192/27 32
68.8%
NORDUnet DK — —
109.105.101.96/27 32
34.4%
NORDUnet SE — —
109.105.114.0/27 32
3.1%
NORDUnet SE — —
109.105.114.32/27 32
3.1%
NORDUnet DK — —
109.105.119.192/27 32
28.1%
NORDUnet DK — —
109.105.121.0/27 32
31.3%
NORDUnet DK — —
109.105.96.144/28 16
43.8%
NORDUnet DK — —
109.105.96.176/28 16
43.8%
NORDUnet DK — —
109.105.97.96/28 16
62.5%
NORDUnet DK — —
109.105.97.176/28 16
62.5%
NORDUnet SE — —
109.105.97.192/28 16
62.5%
NORDUnet DK — —
109.105.98.64/28 16
68.8%
NORDUnet SE — —
109.105.99.32/28 16
56.3%
NORDUnet DK — —
109.105.99.96/28 16
56.3%
NORDUnet SE — —
109.105.99.112/28 16
56.3%
NORDUnet DK — —
109.105.99.176/28 16
56.3%
NORDUnet DK — —
109.105.99.224/28 16
56.3%
NORDUnet DK — —
109.105.101.80/28 16
37.5%
NORDUnet SE — —
109.105.102.48/28 16
50.0%
NORDUnet SE — —
109.105.119.240/28 16
25.0%
NORDUnet DK — —
109.105.121.32/28 16
31.3%
NORDUnet DK — —
193.10.252.16/28 16
31.3%
NORDUnet SE — —
193.10.252.32/28 16
31.3%
NORDUnet SE — —
193.10.252.48/28 16
31.3%
NORDUnet DK — —
109.105.96.0/29 8
50.0%
NORDUnet SE — —
109.105.96.56/29 8
50.0%
NORDUnet SE — —
109.105.96.72/29 8
50.0%
NORDUnet DK — —
109.105.96.88/29 8
50.0%
NORDUnet DK — —
109.105.96.96/29 8
50.0%
NORDUnet DK — —
109.105.96.136/29 8
50.0%
NORDUnet DK — —
109.105.96.160/29 8
50.0%
NORDUnet DK — —
109.105.97.48/29 8
62.5%
NORDUnet DK — —
109.105.97.112/29 8
62.5%
NORDUnet DK — —
109.105.97.152/29 8
62.5%
NORDUnet DK — —
109.105.97.160/29 8
62.5%
NORDUnet DK — —
109.105.97.216/29 8
62.5%
NORDUnet DK — —
109.105.97.224/29 8
62.5%
NORDUnet DK — —
109.105.98.0/29 8
62.5%
NORDUnet SE — —
109.105.98.8/29 8
62.5%
NORDUnet US — —
109.105.98.16/29 8
62.5%
NORDUnet US — —
109.105.98.32/29 8
62.5%
NORDUnet NL — —
109.105.98.40/29 8
62.5%
NORDUnet US — —
109.105.98.48/29 8
62.5%
NORDUnet SE — —
109.105.98.80/29 8
62.5%
NORDUnet NL — —
109.105.98.88/29 8
62.5%
NORDUnet SE — —
109.105.98.96/29 8
62.5%
NORDUnet SE — —
109.105.98.144/29 8
62.5%
NORDUnet SE — —
109.105.98.248/29 8
62.5%
NORDUnet DK — —
109.105.99.8/29 8
62.5%
NORDUnet DK — —
109.105.99.24/29 8
62.5%
NORDUnet DK — —
109.105.99.56/29 8
62.5%
NORDUnet DK — —
109.105.99.72/29 8
62.5%
NORDUnet DK — —
109.105.99.80/29 8
62.5%
NORDUnet DK — —
109.105.99.152/29 8
62.5%
NORDUnet NL — —
109.105.99.160/29 8
62.5%
NORDUnet DE — —
109.105.99.200/29 8
62.5%
NORDUnet DK — —
109.105.99.208/29 8
62.5%
NORDUnet DK — —
109.105.99.240/29 8
62.5%
NORDUnet DK — —

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS2603 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.

PrefixAnnouncement samplesLast seen
193.10.255.0/24 15,181,786 2026-11-13 16:27:46
193.10.254.0/24 21,778 2026-11-13 16:26:15
193.11.3.0/24 21,169 2026-11-13 16:26:15
194.68.13.0/24 20,890 2026-11-13 16:26:15
193.10.252.0/24 16,353 2026-11-13 16:26:15
109.105.120.0/22 16,021 2026-11-13 16:26:18
185.174.116.0/22 15,884 2026-11-13 16:26:15
109.105.112.0/21 15,602 2026-11-13 16:26:18
192.36.171.0/24 15,595 2026-11-13 16:26:15
109.105.96.0/20 14,930 2026-11-13 16:26:18
109.105.114.34/32 145 2026-07-28 12:37:37
109.105.114.33/32 145 2026-07-28 12:37:37
109.105.114.32/32 145 2026-07-28 12:37:37
109.105.114.35/32 145 2026-07-28 12:37:37
109.105.121.192/27 63 2026-07-28 06:06:05
109.105.106.0/24 31 2026-07-31 09:27:27
109.105.121.168/31 2 2026-06-01 18:15:17

Frequently Asked Questions

What is AS2603?

AS2603 is an Autonomous System Number assigned to NORDUnet. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).

How many IP addresses does AS2603 announce?

AS2603 announces 9.7K IPv4 addresses distributed across 9 routed CIDR prefixes. The network is registered in Denmark.

Who operates AS2603?

AS2603 is operated by NORDUnet. The organization is based in Denmark. You can view all IP ranges and related ASNs on the organization page.

What country is AS2603 registered in?

AS2603 is registered in Denmark. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.

Last updated: 2026-11-13 16:24:05 UTC
Share