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AS57043HOSTKEY B.V.

NetherlandsRegistryRIPE NCC

As of 26th September 2026, AS57043 (HOSTKEY B.V.), a network registered in the Netherlands with RIPE NCC, originates 630 IPv4 prefixes covering 174k addresses and 7 IPv6 prefixes. By IPv4 address space that makes it the 1,493rd-largest of the 79,516 networks we see originating IPv4, and the 22nd-largest of 1,023 in the Netherlands. It is seen behind 47 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS174 (Cogent Communications, LLC), and in front of 28 downstream networks. 95% of its announcements have a valid RPKI ROA; 13 are RPKI-invalid. 95% of its routes reach at least 90% of full-feed peers, and 28 prefixes are also originated by another network.

At a glance

IPv4 prefixes

630

IPv6 prefixes

7

IPv4 addresses

174k

IPv6 /64s

43B

Upstream graph

The networks AS57043 is seen behind, one and two hops out, drawn from real AS paths.

AS57043Toward the internet core
Upstream graph for AS57043: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS57043HOSTKEY B.V.This networkAS174Cogent Communicat…AS3257GTT Communication…AS3356Lumen (Level 3)AS6939Hurricane Electri…AS9002RETN LimitedAS1299Arelion (fka. Tel…AS151326DCConnect Communi…AS398465Rackdog LLCAS18106Viewqwest Pte LtdAS20130Depaul UniversityAS6453TATA Communicatio…AS51907Kanton Zug

Networks observed one and two hops upstream of AS57043 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

304

adjacent networks

Upstreams
4715%
Peers
22975%
Downstreams
289%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 47.

Upstreams of AS57043
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer18,389106
AS174Cogent Communications, LLCUSPeer15,710116
AS9002RETN LimitedGBPeer12,599125
AS3257GTT Communications Inc.USPeer7,665143
AS3356Lumen (Level 3)USPeer4,47452
AS59692IQWeb FZ-LLCAEPeer1,79680
AS6762Telecom Italia Sparkle (Seabone)ITPeer1,67727
AS25091IP-Max SACHPeer7613
AS24940Hetzner Online GmbHDEPeer7452
AS12735TurkNet Iletisim Hizmetleri A.S.TRPeer51651

Prefixes

All 637

The largest blocks AS57043 originates, widest first.

Largest prefixes originated by AS57043
PrefixAddressesVisibility
5.39.216.0/212k81/81
46.17.96.0/212k81/81
146.0.72.0/212k81/81
31.207.44.0/221k81/81
43.245.224.0/221k81/81
66.248.204.0/221k81/81
176.222.52.0/221k81/81
185.70.184.0/221k81/81
185.130.224.0/221k81/81
186.246.44.0/221k81/81

Routing health

How AS57043'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

  • Valid94.5%602
  • Invalid2.0%13
  • No ROA3.5%22

Propagation

  • Globally propagated90% of full-feed peers or more95.3%607
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%4.7%30

Prefix sizes

IPv4 — 630 prefixes

IPv6 — 7 prefixes

  • /2934.4B × /6414.3%1
  • /324.3B × /6428.6%2
  • /4016.8M × /6414.3%1
  • /441M × /6428.6%2
  • /4865.5k × /6414.3%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

59 announced and 8 withdrawn in all; the most recent are shown.

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