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AS39521TNGNET B.V.

NetherlandsRegistryRIPE NCC

As of 10th November 2026, AS39521 (TNGNET B.V.), a network registered in the Netherlands with RIPE NCC, originates 75 IPv4 prefixes covering 29.4k addresses and 5 IPv6 prefixes. By IPv4 address space that makes it the 5,822nd-largest of the 80,733 networks we see originating IPv4, and the 85th-largest of 1,042 in the Netherlands. It is seen behind 29 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS174 (Cogent Communications, LLC), and in front of 7 downstream networks. 88% of its announcements have a valid RPKI ROA; 8 are RPKI-invalid. 88% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

75

IPv6 prefixes

5

IPv4 addresses

29.4k

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.…AS20130Depaul UniversityAS132337Axclusive

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

165

adjacent networks

Upstreams
2918%
Peers
12978%
Downstreams
74%

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

Upstreams of AS39521
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer5,554118
AS174Cogent Communications, LLCUSPeer3,09223
AS6830Liberty Global Europe Holding B.V.EUPeer2,589138
AS6206Netrouting B.V.NLPeer2,36076
AS61138Zappie Host LLCUSPeer825138
AS5511Orange S.A.FRPeer325133
AS25091IP-Max SACHPeer1903
AS3170VeloxServ Communications LtdGBPeer1882
AS39122Blacknight Internet Solutions LimitedIEPeer1842
AS24482SG.GSSGPeer1832

Prefixes

All 80

The largest blocks AS39521 originates, widest first.

Largest prefixes originated by AS39521
PrefixAddressesVisibility
5.22.204.0/221k76/76
45.130.100.0/221k76/76
68.164.0.0/221k76/76
68.165.140.0/221k76/76
68.165.176.0/221k76/76
68.165.208.0/221k76/76
72.244.124.0/221k1/76
74.0.132.0/221k76/76
74.0.160.0/221k76/76
74.0.200.0/221k76/76

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

  • Valid87.5%70
  • Invalid10.0%8
  • No ROA2.5%2

Propagation

  • Globally propagated90% of full-feed peers or more87.5%70
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%12.5%10

Prefix sizes

IPv4 — 75 prefixes

IPv6 — 5 prefixes

  • /2934.4B × /6420.0%1
  • /324.3B × /6440.0%2
  • /36268M × /6420.0%1
  • /4865.5k × /6420.0%1

Recent changes

Announcements that started or stopped since 11th Oct 2026.

35 announced and 1 withdrawn in all; the most recent are shown.

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