subnet.im

AS18259NTT DOCOMO BUSINESS, Inc

JapanRegistryAPNIC

As of 28th September 2026, AS18259 (NTT DOCOMO BUSINESS, Inc), a network registered in Japan with APNIC, originates 6 IPv4 prefixes covering 9k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 11,291st-largest of the 79,544 networks we see originating IPv4, and the 330th-largest of 729 in Japan. It is seen behind 2 upstream networks, most often AS2914 (NTT America, Inc.) and AS4713 (NTT Communications Corporation (OCN)), and in front of 1 downstream network. 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

6

IPv6 prefixes

2

IPv4 addresses

9k

IPv6 /64s

4.3B

Upstream graph

The networks AS18259 is seen behind, one and two hops out, drawn from real AS paths.

AS18259Toward the internet core
Upstream graph for AS18259: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS18259NTT DOCOMO BUSINE…This networkAS2914NTT America, Inc.AS4713NTT Communication…AS3130RGnet OUAS49544i3D.net B.VAS2497Internet Initiati…

Networks observed one and two hops upstream of AS18259 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

6

adjacent networks

Upstreams
233%
Peers
350%
Downstreams
117%

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

Upstreams of AS18259
NetworkCountryRelationshipPathsVantage pts
AS2914NTT America, Inc.USPeer851147
AS4713NTT Communications Corporation (OCN)JPPeer122

Prefixes

The largest blocks AS18259 originates, widest first.

Largest prefixes originated by AS18259
PrefixAddressesVisibility
202.178.96.0/204.1k81/82
202.178.96.0/212k81/82
202.178.104.0/221k81/82
202.178.108.0/221k81/82
202.178.106.0/2351281/82
202.178.104.0/2425682/82
2401:4640::/324.3B × /6465/65
2001:218:2200::/4016.8M × /6465/65

Routing health

How AS18259'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%8
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%8
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 6 prefixes

IPv6 — 2 prefixes

  • /324.3B × /6450.0%1
  • /4016.8M × /6450.0%1

Recent changes

Announcements that started or stopped since 29th Aug 2026.

No announcement by AS18259 started or stopped in this period.

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