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AS51923'Nothing But Air' Services B.V.

NetherlandsRegistryRIPE NCC

As of 11th November 2026, AS51923 ('Nothing But Air' Services B.V.), a network registered in the Netherlands with RIPE NCC, originates 1 IPv6 prefix. It is seen behind 1 upstream network, most often AS31477 (Duocast B.V.), and in front of 1 downstream network. 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

0

IPv6 prefixes

1

IPv4 addresses

0

IPv6 /64s

1M

Upstream graph

The networks AS51923 is seen behind, one and two hops out, drawn from real AS paths.

AS51923Toward the internet core
Upstream graph for AS51923: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS51923'Nothing But Air'…This networkAS31477Duocast B.V.AS1299Arelion (fka. Tel…AS2914NTT America, Inc.

Networks observed one and two hops upstream of AS51923 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

4

adjacent networks

Upstreams
125%
Peers
250%
Downstreams
125%

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

Upstreams of AS51923
NetworkCountryRelationshipPathsVantage pts
AS31477Duocast B.V.NLPeer310137

Prefixes

The largest blocks AS51923 originates, widest first.

Largest prefixes originated by AS51923
PrefixAddressesVisibility
2a01:1b0:c000::/441M × /6461/63

Routing health

How AS51923'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%1
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%1
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv6 — 1 prefixes

  • /441M × /64100.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS51923 started or stopped in this period.

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