AS1835Forskningsnettet - Danish NREN
European UnionRegistryRIPE NCCTypeEyeballAs of 27th September 2026, AS1835 (Forskningsnettet - Danish NREN), an access network registered in European Union with RIPE NCC, originates 5 IPv4 prefixes covering 164k addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 1,557th-largest of the 79,516 networks we see originating IPv4, and the 13th-largest of 155 in European Union. It is seen behind 3 upstream networks, most often AS2603 (NORDUnet) and AS6939 (Hurricane Electric LLC), and in front of 8 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS1835 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS1835 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
24
adjacent networks
- Upstreams
- 313%
- Peers
- 1354%
- Downstreams
- 833%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS2603NORDUnet |  DK | Peer | 1,421 | 142 |
| AS6939Hurricane Electric LLC |  US | Peer | 85 | 16 |
| AS49544i3D.net B.V |  NL | Peer | 19 | 2 |
Prefixes
The largest blocks AS1835 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 130.225.0.0/16 | 65.5k | 81/81 |
| 130.226.0.0/16 | 65.5k | 81/81 |
| 192.38.0.0/17 | 32.8k | 81/81 |
| 193.3.238.0/24 | 256 | 81/81 |
| 193.163.46.0/24 | 256 | 80/81 |
| 2001:878::/30 | 17.2B × /64 | 63/64 |
| 2001:878::/32 | 4.3B × /64 | 64/64 |
| 2001:7f8:1f::/48 | 65.5k × /64 | 62/64 |
Routing health
How AS1835'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
- Valid100.0%8
- Invalid0.0%0
- No ROA0.0%0
Propagation
- Globally propagated90% of full-feed peers or more100.0%8
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
IPv6 — 3 prefixes
- /3017.2B × /6433.3%1
- /324.3B × /6433.3%1
- /4865.5k × /6433.3%1
Recent changes
Announcements that started or stopped since 28th Aug 2026.
No announcement by AS1835 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.