subnet.im

AS7257OTO GK

JapanRegistryRIPE NCC

As of 27th September 2026, AS7257 (OTO GK), a network registered in Japan with RIPE NCC, originates 2 IPv4 prefixes covering 512 addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 48,558th-largest of the 79,525 networks we see originating IPv4, and the 590th-largest of 729 in Japan. It is seen behind 1 upstream network, most often AS9663 (OTO GK). None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

2

IPv6 prefixes

1

IPv4 addresses

512

IPv6 /64s

34.4B

Upstream graph

The networks AS7257 is seen behind, one and two hops out, drawn from real AS paths.

AS7257Toward the internet core
Upstream graph for AS7257: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS7257OTO GKThis networkAS9663OTO GKAS7719ITSUDATTEAS30058FDCservers.net

Networks observed one and two hops upstream of AS7257 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

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

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

Upstreams of AS7257
NetworkCountryRelationshipPathsVantage pts
AS9663OTO GKJPPeer223143

Prefixes

The largest blocks AS7257 originates, widest first.

Largest prefixes originated by AS7257
PrefixAddressesVisibility
168.151.54.0/2425680/81
208.88.66.0/2425681/81
2a06:40::/2934.4B × /6462/64

Routing health

How AS7257'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

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%3

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 2 prefixes

IPv6 — 1 prefixes

  • /2934.4B × /64100.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS7257 started or stopped in this period.

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