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AS5501Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

GermanyRegistryRIPE NCC

As of 22nd October 2026, AS5501 (Fraunhofer-Gesellschaft zur Foerderung…), a network registered in Germany with RIPE NCC, originates 38 IPv4 prefixes covering 148k addresses and 13 IPv6 prefixes. By IPv4 address space that makes it the 1,670th-largest of the 79,663 networks we see originating IPv4, and the 43rd-largest of 2,307 in Germany. It is seen behind 3 upstream networks, most often AS553 (BelWü) and AS680 (Deutsches Forschungsnetz (DFN)). 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

38

IPv6 prefixes

13

IPv4 addresses

148k

IPv6 /64s

852k

Upstream graph

The networks AS5501 is seen behind, one and two hops out, drawn from real AS paths.

AS5501Toward the internet core
Upstream graph for AS5501: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS5501Fraunhofer-Gesell…This networkAS553BelWüAS680Deutsches Forschu…AS13045htp GmbHAS2914NTT America, Inc.AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS5501 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

6

adjacent networks

Upstreams
350%
Peers
350%
Downstreams
00%

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

Upstreams of AS5501
NetworkCountryRelationshipPathsVantage pts
AS553BelWüDEPeer2,303140
AS680Deutsches Forschungsnetz (DFN)DEPeer987139
AS13045htp GmbHDEPeer449141

Prefixes

All 51

The largest blocks AS5501 originates, widest first.

Largest prefixes originated by AS5501
PrefixAddressesVisibility
137.251.0.0/1665.5k77/77
129.233.0.0/1732.8k77/77
129.233.128.0/1732.8k77/77
153.96.0.0/212k77/77
153.97.0.0/212k77/77
153.96.12.0/221k77/77
153.96.220.0/221k77/77
192.44.0.0/221k77/77
153.96.8.0/2351277/77
153.96.54.0/2351277/77

Routing health

How AS5501'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%51
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%51
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 38 prefixes

IPv6 — 13 prefixes

  • /4865.5k × /64100.0%13

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS5501 started or stopped in this period.

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