subnet.im

AS51517Arend Brouwer

NetherlandsRegistryRIPE NCC

As of 11th November 2026, AS51517 (Arend Brouwer), a network registered in the Netherlands with RIPE NCC, originates 4 IPv4 prefixes covering 1k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 36,499th-largest of the 80,743 networks we see originating IPv4, and the 511th-largest of 1,042 in the Netherlands. It is seen behind 12 upstream networks, most often AS28685 (Routit BV) and AS31477 (Duocast B.V.). 83% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 83% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

4

IPv6 prefixes

2

IPv4 addresses

1k

IPv6 /64s

4.3B

Upstream graph

The networks AS51517 is seen behind, one and two hops out, drawn from real AS paths.

AS51517Toward the internet core
Upstream graph for AS51517: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS51517Arend BrouwerThis networkAS6939Hurricane Electri…AS24482SG.GSAS25091IP-Max SAAS28685Routit BVAS31477Duocast B.V.AS20130Depaul UniversityAS132337AxclusiveAS38623Metfone (Viettel …AS215859Hetzner Cloud - S…AS1136KPN B.V.AS1299Arelion (fka. Tel…AS2914NTT America, Inc.

Networks observed one and two hops upstream of AS51517 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

63

adjacent networks

Upstreams
1219%
Peers
5181%
Downstreams
00%

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

Upstreams of AS51517
NetworkCountryRelationshipPathsVantage pts
AS28685Routit BVNLPeer215137
AS31477Duocast B.V.NLPeer12864
AS6939Hurricane Electric LLCUSPeer2521
AS25091IP-Max SACHPeer43
AS24482SG.GSSGPeer43
AS8298IPng Networks GmbHCHPeer32
AS49544i3D.net B.VNLPeer32
AS132337AxclusiveSGAdjacent32
AS39122Blacknight Internet Solutions LimitedIEPeer32
AS24940Hetzner Online GmbHDEPeer32

Prefixes

The largest blocks AS51517 originates, widest first.

Largest prefixes originated by AS51517
PrefixAddressesVisibility
91.217.208.0/2425676/76
103.251.156.0/2425676/76
103.251.157.0/2425676/76
103.251.159.0/2425676/76
2a10:e300::/324.3B × /6461/63
2a10:e300:8411::/4865.5k × /6428/63

Routing health

How AS51517'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

  • Valid83.3%5
  • Invalid0.0%0
  • No ROA16.7%1

Propagation

  • Globally propagated90% of full-feed peers or more83.3%5
  • Partially propagated40% to 90%16.7%1
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 4 prefixes

IPv6 — 2 prefixes

  • /324.3B × /6450.0%1
  • /4865.5k × /6450.0%1

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.