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AS4713NTT Communications Corporation (OCN)

JapanRegistryAPNICTypeEyeball

As of 27th September 2026, AS4713 (NTT Communications Corporation (OCN)), an access network registered in Japan with APNIC, originates 181 IPv4 prefixes covering 28.6M addresses and 6 IPv6 prefixes. By IPv4 address space that makes it the 20th-largest of the 79,525 networks we see originating IPv4, and the 2nd-largest of 729 in Japan. It is seen behind 3 upstream networks, most often AS2914 (NTT America, Inc.) and AS2497 (Internet Initiative Japan Inc.), and in front of 97 downstream networks. 41% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. Over 99% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

181

IPv6 prefixes

6

IPv4 addresses

28.6M

IPv6 /64s

4.4T

Upstream graph

The networks AS4713 is seen behind, one and two hops out, drawn from real AS paths.

AS4713Toward the internet core
Upstream graph for AS4713: 7 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS4713NTT Communication…This networkAS2497Internet Initiati…AS2516KDDI CorporationAS2914NTT America, Inc.AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS3130RGnet OUAS49544i3D.net B.V

Networks observed one and two hops upstream of AS4713 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

226

adjacent networks

Upstreams
31%
Peers
12656%
Downstreams
9743%

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

Upstreams of AS4713
NetworkCountryRelationshipPathsVantage pts
AS2914NTT America, Inc.USPeer46,260145
AS2497Internet Initiative Japan Inc.JPPeer2,833141
AS2516KDDI CorporationJPPeer1513

Prefixes

All 187

The largest blocks AS4713 originates, widest first.

Largest prefixes originated by AS4713
PrefixAddressesVisibility
153.128.0.0/104.2M79/81
180.0.0.0/104.2M80/81
114.160.0.0/112.1M80/81
153.192.0.0/112.1M80/81
60.32.0.0/121M80/81
114.144.0.0/121M80/81
118.0.0.0/121M80/81
122.16.0.0/121M80/81
153.224.0.0/121M80/81
58.88.0.0/13524k80/81

Routing health

How AS4713'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

  • Valid40.6%76
  • Invalid0.0%0
  • No ROA59.4%111

Propagation

  • Globally propagated90% of full-feed peers or more99.5%186
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.5%1

Prefix sizes

IPv4 — 181 prefixes

IPv6 — 6 prefixes

  • /224.4T × /6416.7%1
  • /324.3B × /6433.3%2
  • /4865.5k × /6433.3%2
  • /49 and longerAggregated16.7%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS4713 started or stopped in this period.

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