AS37917University of Tsukuba
JapanRegistryAPNICAt a glance
IPv4 prefixes
3
IPv6 prefixes
0
IPv4 addresses
132k
IPv6 /64s
0
Upstream graph
The networks AS37917 is seen behind, one and two hops out, drawn from real AS paths.
AS37917Toward the internet core
Networks observed one and two hops upstream of AS37917 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
4
adjacent networks
- Upstreams
- 250%
- Peers
- 250%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS2907Science Information Network | JP | Peer | 174 | 58 |
| AS63770Industrial Cyber Security Center of Excellence | JP | Peer | 63 | 21 |
Prefixes
The largest blocks AS37917 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 130.158.0.0/16 | 65.5k | 79/80 |
| 133.51.0.0/16 | 65.5k | 79/80 |
| 163.220.252.0/22 | 1k | 79/80 |
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.