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.
- Baseline (neutral) 65
- Multiple-origin (MOAS) routing anomaly −12
- Academic allocation +6
- Trust score 59 / 100
Experimental · trust-vectors model v1.1.0 — 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.
⚠ 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.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 193.10.255.0/24 | AS2603, AS2832 | 2026-07-17 19:22:38 |
Network profile
Source: PeeringDB →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, …
Top CIDR ranges
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.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 193.10.255.0/24 | 4,879,801 | 2026-07-18 11:25:46 |
| 193.10.254.0/24 | 5,372 | 2026-07-18 10:52:51 |
| 185.174.116.0/22 | 5,300 | 2026-07-18 10:52:36 |
| 193.11.3.0/24 | 5,289 | 2026-07-18 10:52:36 |
| 109.105.120.0/22 | 5,245 | 2026-07-18 10:52:06 |
| 194.68.13.0/24 | 5,240 | 2026-07-18 10:52:36 |
| 193.10.252.0/24 | 5,179 | 2026-07-18 10:52:36 |
| 109.105.112.0/21 | 5,140 | 2026-07-18 10:52:06 |
| 192.36.171.0/24 | 5,023 | 2026-07-18 10:52:36 |
| 109.105.96.0/20 | 4,996 | 2026-07-18 10:52:06 |
| 109.105.114.34/32 | 94 | 2026-07-18 07:38:16 |
| 109.105.114.33/32 | 94 | 2026-07-18 07:38:16 |
| 109.105.114.32/32 | 94 | 2026-07-18 07:38:16 |
| 109.105.114.35/32 | 94 | 2026-07-18 07:38:16 |
| 109.105.121.192/27 | 41 | 2026-07-18 06:45:56 |
| 109.105.121.168/31 | 2 | 2026-06-01 18:15:17 |
| 109.105.106.0/24 | 1 | 2026-05-29 21:15:22 |
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 13 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.
