subnet.im

AS10021KVH Co.,Ltd

JapanRegistryAPNIC

As of 10th November 2026, AS10021 (KVH Co.,Ltd), a network registered in Japan with APNIC, originates 45 IPv4 prefixes covering 111k addresses and 4 IPv6 prefixes. By IPv4 address space that makes it the 2,290th-largest of the 80,723 networks we see originating IPv4, and the 98th-largest of 737 in Japan. It is seen behind 1 upstream network, most often AS8220 (COLT), and in front of 13 downstream networks. 84% of its announcements have 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

45

IPv6 prefixes

4

IPv4 addresses

111k

IPv6 /64s

4.3B

Upstream graph

The networks AS10021 is seen behind, one and two hops out, drawn from real AS paths.

AS10021Toward the internet core
Upstream graph for AS10021: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS10021KVH Co.,LtdThis networkAS8220COLTAS1299Arelion (fka. Tel…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS10021 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

28

adjacent networks

Upstreams
14%
Peers
1450%
Downstreams
1346%

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

Upstreams of AS10021
NetworkCountryRelationshipPathsVantage pts
AS8220COLTGBPeer6,512137

Prefixes

All 49

The largest blocks AS10021 originates, widest first.

Largest prefixes originated by AS10021
PrefixAddressesVisibility
133.148.0.0/1665.5k76/76
27.110.32.0/204.1k76/76
203.167.48.0/204.1k76/76
27.110.48.0/212k76/76
61.120.192.0/212k76/76
110.50.64.0/212k76/76
114.31.80.0/212k76/76
114.31.88.0/212k76/76
117.55.208.0/212k76/76
117.55.216.0/212k76/76

Routing health

How AS10021'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

  • Valid83.7%41
  • Invalid0.0%0
  • No ROA16.3%8

Propagation

  • Globally propagated90% of full-feed peers or more100.0%49
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 45 prefixes

IPv6 — 4 prefixes

  • /332.1B × /6425.0%1
  • /341.1B × /6450.0%2
  • /4865.5k × /6425.0%1

Recent changes

Announcements that started or stopped since 11th Oct 2026.

No announcement by AS10021 started or stopped in this period.

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