subnet.im

AS2603NORDUnet

DenmarkRegistryRIPE NCCTypeCarrier

As of 26th September 2026, AS2603 (NORDUnet), a transit carrier registered in Denmark with RIPE NCC, originates 10 IPv4 prefixes covering 9.7k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 10,672nd-largest of the 79,480 networks we see originating IPv4, and the 47th-largest of 328 in Denmark. It is seen behind 47 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS3491 (PCCW Global (HK) Ltd.), and in front of 15 downstream networks. 83% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers, and 2 prefixes are also originated by another network.

At a glance

IPv4 prefixes

10

IPv6 prefixes

2

IPv4 addresses

9.7k

IPv6 /64s

38.7B

Upstream graph

The networks AS2603 is seen behind, one and two hops out, drawn from real AS paths.

AS2603Toward the internet core
Upstream graph for AS2603: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS2603NORDUnetThis networkAS1299Arelion (fka. Tel…AS2497Internet Initiati…AS3491PCCW Global (HK) …AS6667Elisa OyjAS25091IP-Max SAAS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS24516Virtutel Pty LtdAS58511Swoop (Anycast Gl…AS3356Lumen (Level 3)AS8298IPng Networks GmbHAS56662Marcin Gondek

Networks observed one and two hops upstream of AS2603 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

248

adjacent networks

Upstreams
4719%
Peers
18675%
Downstreams
156%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 47.

Upstreams of AS2603
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer4,87843
AS3491PCCW Global (HK) Ltd.HKPeer3,28314
AS6667Elisa OyjFIPeer2,9024
AS25091IP-Max SACHPeer2,5554
AS2497Internet Initiative Japan Inc.JPPeer2,3166
AS49544i3D.net B.VNLPeer1,9804
AS14537Continent 8 LLCUSPeer1,8584
AS3170VeloxServ Communications LtdGBPeer1,8002
AS37271Workonline Communications(Pty) LtdZAPeer1,7962
AS5413Wavenet LimitedGBPeer1,7702

Prefixes

The largest blocks AS2603 originates, widest first.

Largest prefixes originated by AS2603
PrefixAddressesVisibility
109.105.96.0/204.1k81/81
109.105.112.0/212k81/81
109.105.120.0/221k81/81
185.174.116.0/221k81/81
192.36.171.0/2425680/81
193.10.252.0/2425681/81
193.10.254.0/2425681/81
193.10.255.0/2425678/81
193.11.3.0/2425681/81
194.68.13.0/2425681/81

Routing health

How AS2603'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

  • Valid83.3%10
  • Invalid0.0%0
  • No ROA16.7%2

Propagation

  • Globally propagated90% of full-feed peers or more100.0%12
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 10 prefixes

IPv6 — 2 prefixes

  • /2934.4B × /6450.0%1
  • /324.3B × /6450.0%1

Recent changes

Announcements that started or stopped since 27th Aug 2026.

No announcement by AS2603 started or stopped in this period.

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