subnet.im

AS4725SoftBank Corp.

JapanRegistryAPNICTypeEyeball

As of 10th November 2026, AS4725 (SoftBank Corp.), an access network registered in Japan with APNIC, originates 144 IPv4 prefixes covering 1.9M addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 280th-largest of the 80,733 networks we see originating IPv4, and the 15th-largest of 737 in Japan. It is seen behind 2 upstream networks, most often AS17676 (SoftBank Corp.) and AS2914 (NTT America, Inc.), and in front of 10 downstream networks. Under 1% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 94% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

144

IPv6 prefixes

1

IPv4 addresses

1.9M

IPv6 /64s

4.3B

Upstream graph

The networks AS4725 is seen behind, one and two hops out, drawn from real AS paths.

AS4725Toward the internet core
Upstream graph for AS4725: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS4725SoftBank Corp.This networkAS2914NTT America, Inc.AS17676SoftBank Corp.AS49544i3D.net B.VAS215859Hetzner Cloud - S…AS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS4725 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

24

adjacent networks

Upstreams
28%
Peers
1250%
Downstreams
1042%

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

Upstreams of AS4725
NetworkCountryRelationshipPathsVantage pts
AS17676SoftBank Corp.JPPeer11,930138
AS2914NTT America, Inc.USPeer45676

Prefixes

All 145

The largest blocks AS4725 originates, widest first.

Largest prefixes originated by AS4725
PrefixAddressesVisibility
219.66.0.0/15131k76/76
1.5.0.0/1665.5k76/76
39.3.0.0/1665.5k76/76
61.116.0.0/1665.5k76/76
61.123.0.0/1665.5k76/76
61.196.0.0/1665.5k76/76
61.209.0.0/1665.5k76/76
143.90.0.0/1665.5k76/76
202.33.0.0/1665.5k76/76
210.197.0.0/1665.5k76/76

Routing health

How AS4725'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

  • Valid0.7%1
  • Invalid0.0%0
  • No ROA99.3%144

Propagation

  • Globally propagated90% of full-feed peers or more94.5%137
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%5.5%8

Prefix sizes

IPv4 — 144 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 11th Oct 2026.

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