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AS50917Diederik Focko de Zee

NetherlandsRegistryRIPE NCCTypeCarrier

As of 10th November 2026, AS50917 (Diederik Focko de Zee), a transit carrier registered in the Netherlands with RIPE NCC, originates 3 IPv4 prefixes covering 768 addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 45,664th-largest of the 80,733 networks we see originating IPv4, and the 621st-largest of 1,042 in the Netherlands. It is seen behind 22 upstream networks, most often AS174 (Cogent Communications, LLC) and AS216265 (ARISTO NETWORKS LTD), and in front of 26 downstream networks. 60% 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

3

IPv6 prefixes

2

IPv4 addresses

768

IPv6 /64s

131k

Upstream graph

The networks AS50917 is seen behind, one and two hops out, drawn from real AS paths.

AS50917Toward the internet core
Upstream graph for AS50917: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS50917Diederik Focko de…This networkAS174Cogent Communicat…AS6939Hurricane Electri…AS9002RETN LimitedAS20495We Dare B.V.AS216265ARISTO NETWORKS L…AS1299Arelion (fka. Tel…AS151326DCConnect Communi…AS3356Lumen (Level 3)AS13030Init7 (Switzerlan…AS18106Viewqwest Pte LtdAS1273Vodafone Group PLCAS6453TATA Communicatio…

Networks observed one and two hops upstream of AS50917 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

158

adjacent networks

Upstreams
2214%
Peers
11070%
Downstreams
2616%

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

Upstreams of AS50917
NetworkCountryRelationshipPathsVantage pts
AS174Cogent Communications, LLCUSPeer6,29290
AS216265ARISTO NETWORKS LTDGBPeer4,29990
AS20495We Dare B.V.NLPeer3,02823
AS9002RETN LimitedGBPeer2,973101
AS6939Hurricane Electric LLCUSPeer55313
AS35133Eranium B.V.NLPeer46926
AS39122Blacknight Internet Solutions LimitedIEPeer2682
AS24940Hetzner Online GmbHDEPeer2562
AS132337AxclusiveSGAdjacent2292
AS3170VeloxServ Communications LtdGBPeer2242

Prefixes

The largest blocks AS50917 originates, widest first.

Largest prefixes originated by AS50917
PrefixAddressesVisibility
45.152.39.0/2425675/76
89.37.98.0/2425675/76
103.141.12.0/2425676/76
2001:678:7ec::/4865.5k × /6462/63
2a10:9903:201::/4865.5k × /6461/63

Routing health

How AS50917'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

  • Valid60.0%3
  • Invalid0.0%0
  • No ROA40.0%2

Propagation

  • Globally propagated90% of full-feed peers or more100.0%5
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 3 prefixes

IPv6 — 2 prefixes

  • /4865.5k × /64100.0%2

Recent changes

Announcements that started or stopped since 12th Oct 2026.

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