subnet.im

AS134351Leaseweb Japan K.K.

JapanRegistryAPNIC

As of 11th November 2026, AS134351 (Leaseweb Japan K.K.), a network registered in Japan with APNIC, originates 53 IPv4 prefixes covering 21.8k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 6,817th-largest of the 80,747 networks we see originating IPv4, and the 249th-largest of 737 in Japan. It is seen behind 5 upstream networks, most often AS6453 (TATA Communications (America) Inc) and AS2914 (NTT America, Inc.). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 95% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

53

IPv6 prefixes

2

IPv4 addresses

21.8k

IPv6 /64s

4.3B

Upstream graph

The networks AS134351 is seen behind, one and two hops out, drawn from real AS paths.

AS134351Toward the internet core
Upstream graph for AS134351: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS134351Leaseweb Japan K.…This networkAS174Cogent Communicat…AS2914NTT America, Inc.AS4637Telstra Internati…AS6453TATA Communicatio…AS16265LeaseWeb Network …AS49544i3D.net B.VAS215859Hetzner Cloud - S…AS16552Tiggee LLCAS32590Valve CorporationAS8220COLTAS35280F5 Networks SARLAS7713PT Telkom Indones…

Networks observed one and two hops upstream of AS134351 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

10

adjacent networks

Upstreams
550%
Peers
550%
Downstreams
00%

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

Upstreams of AS134351
NetworkCountryRelationshipPathsVantage pts
AS6453TATA Communications (America) IncUSPeer1,29150
AS2914NTT America, Inc.USPeer1,29148
AS4637Telstra International LimitedHKPeer79343
AS16265LeaseWeb Network B.V.NLPeer47518
AS174Cogent Communications, LLCUSPeer993

Prefixes

All 55

The largest blocks AS134351 originates, widest first.

Largest prefixes originated by AS134351
PrefixAddressesVisibility
23.81.40.0/212k76/76
23.106.224.0/212k76/76
23.26.44.0/221k76/76
142.91.108.0/221k76/76
173.234.64.0/221k76/76
108.165.82.0/2351276/76
108.165.180.0/2351276/76
142.91.104.0/2351276/76
142.91.106.0/2351276/76
188.116.6.0/2351276/76

Routing health

How AS134351'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%55
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more94.5%52
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%5.5%3

Prefix sizes

IPv4 — 53 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.