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AS5520Universitaet zu Koeln

GermanyRegistryRIPE NCC

As of 22nd October 2026, AS5520 (Universitaet zu Koeln), a network registered in Germany with RIPE NCC, originates 6 IPv4 prefixes covering 68.1k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 3,211th-largest of the 79,663 networks we see originating IPv4, and the 98th-largest of 2,307 in Germany. It is seen behind 1 upstream network, most often AS680 (Deutsches Forschungsnetz (DFN)). 43% 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.

At a glance

IPv4 prefixes

6

IPv6 prefixes

1

IPv4 addresses

68.1k

IPv6 /64s

34.4B

Upstream graph

The networks AS5520 is seen behind, one and two hops out, drawn from real AS paths.

AS5520Toward the internet core
Upstream graph for AS5520: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS5520Universitaet zu K…This networkAS680Deutsches Forschu…AS2914NTT America, Inc.AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS5520 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

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS5520
NetworkCountryRelationshipPathsVantage pts
AS680Deutsches Forschungsnetz (DFN)DEPeer524139

Prefixes

The largest blocks AS5520 originates, widest first.

Largest prefixes originated by AS5520
PrefixAddressesVisibility
134.95.0.0/1665.5k77/77
185.240.116.0/221k77/77
134.107.216.0/2351277/77
134.107.226.0/2351277/77
134.107.209.0/2425677/77
134.107.225.0/2425677/77
2a00:a200::/2934.4B × /6462/64

Routing health

How AS5520'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

  • Valid42.9%3
  • Invalid0.0%0
  • No ROA57.1%4

Propagation

  • Globally propagated90% of full-feed peers or more100.0%7
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 6 prefixes

IPv6 — 1 prefixes

  • /2934.4B × /64100.0%1

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS5520 started or stopped in this period.

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