subnet.im

AS39521TNGNET B.V.

NetherlandsRegistryRIPE NCC

As of 26th September 2026, AS39521 (TNGNET B.V.), a network registered in the Netherlands with RIPE NCC, originates 42 IPv4 prefixes covering 20.7k addresses and 4 IPv6 prefixes. By IPv4 address space that makes it the 6,894th-largest of the 79,516 networks we see originating IPv4, and the 98th-largest of 1,023 in the Netherlands. It is seen behind 28 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS6206 (Netrouting B.V.), and in front of 7 downstream networks. 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

42

IPv6 prefixes

4

IPv4 addresses

20.7k

IPv6 /64s

43.2B

Upstream graph

The networks AS39521 is seen behind, one and two hops out, drawn from real AS paths.

AS39521Toward the internet core
Upstream graph for AS39521: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS39521TNGNET B.V.This networkAS174Cogent Communicat…AS6206Netrouting B.V.AS6830Liberty Global Eu…AS6939Hurricane Electri…AS61138Zappie Host LLCAS151326DCConnect Communi…AS1299Arelion (fka. Tel…AS6453TATA Communicatio…AS6667Elisa OyjAS57866Fusix Networks B.…AS18106Viewqwest Pte LtdAS20130Depaul University

Networks observed one and two hops upstream of AS39521 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

169

adjacent networks

Upstreams
2817%
Peers
13479%
Downstreams
74%

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

Upstreams of AS39521
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer4,392133
AS6206Netrouting B.V.NLPeer2,83381
AS174Cogent Communications, LLCUSPeer2,12822
AS6830Liberty Global Europe Holding B.V.EUPeer1,81229
AS61138Zappie Host LLCUSPeer1,113145
AS5511Orange S.A.FRPeer21182
AS25091IP-Max SACHPeer1383
AS3170VeloxServ Communications LtdGBPeer1322
AS39122Blacknight Internet Solutions LimitedIEPeer1302
AS49544i3D.net B.VNLPeer1292

Prefixes

All 46

The largest blocks AS39521 originates, widest first.

Largest prefixes originated by AS39521
PrefixAddressesVisibility
5.22.204.0/221k81/81
45.130.100.0/221k81/81
68.164.0.0/221k81/81
68.165.140.0/221k81/81
68.165.176.0/221k81/81
68.165.208.0/221k81/81
72.244.124.0/221k81/81
74.0.132.0/221k81/81
74.0.160.0/221k81/81
74.0.200.0/221k81/81

Routing health

How AS39521'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%46
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%46
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 42 prefixes

IPv6 — 4 prefixes

  • /2934.4B × /6425.0%1
  • /324.3B × /6450.0%2
  • /36268M × /6425.0%1

Recent changes

Announcements that started or stopped since 27th Aug 2026.

  • Withdrawn167.148.40.0/2421st Sept 2026
  • Withdrawn82.21.112.0/2421st Sept 2026
  • Withdrawn82.23.191.0/2421st Sept 2026
  • Withdrawn82.47.200.0/2421st Sept 2026
  • Withdrawn84.75.190.0/2421st Sept 2026

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