AS213471YAMAMOTO Hiroshi
JapanRegistryRIPE NCCAs of 11th November 2026, AS213471 (YAMAMOTO Hiroshi), a network registered in Japan with RIPE NCC, originates 6 IPv6 prefixes. It is seen behind 4 upstream networks, most often AS63798 (Industrial Cyber Security Center of…) and AS9663 (OTO GK). 83% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 83% of its routes reach at least 90% of full-feed peers.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS213471 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS213471 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
13
adjacent networks
- Upstreams
- 431%
- Peers
- 969%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS63798Industrial Cyber Security Center of Excellence | JP | Peer | 124 | 62 |
| AS9663OTO GK | JP | Peer | 72 | 62 |
| AS214481Wojciech Czapkowicz |  PL | Peer | 62 | 62 |
| AS215467Skhron OU |  EE | Peer | 62 | 62 |
Prefixes
The largest blocks AS213471 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 2a06:41::/44 | 1M × /64 | 62/63 |
| 2a06:41:10::/44 | 1M × /64 | 62/63 |
| 2a06:41:20::/44 | 1M × /64 | 62/63 |
| 2a06:41:70::/44 | 1M × /64 | 62/63 |
| 2a0b:4e07:d5::/48 | 65.5k × /64 | 10/63 |
| 2a0b:4e07:d7::/48 | 65.5k × /64 | 62/63 |
Routing health
How AS213471'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
- Valid83.3%5
- Invalid0.0%0
- No ROA16.7%1
Propagation
- Globally propagated90% of full-feed peers or more83.3%5
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%16.7%1
Prefix sizes
IPv6 — 6 prefixes
- /441M × /6466.7%4
- /4865.5k × /6433.3%2
Recent changes
Announcements that started or stopped since 12th Oct 2026.
- Announced2a0b:4e07:d5::/483rd Nov 2026
- Withdrawn2602:f2dc:95::/482nd Nov 2026
- Announced2a06:41:70::/4426th Oct 2026
- Announced2a0b:4e07:d7::/4826th Oct 2026
- Withdrawn2a06:41:70::/4423rd Oct 2026
- Withdrawn2a06:41:80::/4223rd Oct 2026
- Withdrawn2a0b:4e07:d7::/4823rd Oct 2026
- Announced2a06:41:20::/4413th Oct 2026
- Withdrawn2a06:41:20::/4412th Oct 2026
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.