AS231Michigan State University
United StatesRegistryARINAs of 23rd October 2026, AS231 (Michigan State University), a network registered in the United States with ARIN, originates 7 IPv4 prefixes covering 790k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 540th-largest of the 79,652 networks we see originating IPv4, and the 127th-largest of 18,475 in the United States. It is seen behind 3 upstream networks, most often AS237 (Merit Network Inc.) and AS11164 (Internet2 I2PX), and in front of 1 downstream network. 33% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 78% 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 AS231 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS231 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
8
adjacent networks
- Upstreams
- 338%
- Peers
- 450%
- Downstreams
- 113%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS237Merit Network Inc. | US | Peer | 601 | 140 |
| AS11164Internet2 I2PX | US | Peer | 56 | 56 |
| AS11537Internet2 | US | Peer | 2 | 2 |
Prefixes
The largest blocks AS231 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 35.8.0.0/13 | 524k | 76/77 |
| 35.20.0.0/14 | 262k | 77/77 |
| 35.12.240.0/21 | 2k | 32/77 |
| 192.108.188.0/24 | 256 | 77/77 |
| 192.108.190.0/24 | 256 | 77/77 |
| 192.108.191.0/24 | 256 | 77/77 |
| 192.231.113.0/24 | 256 | 77/77 |
| 2605:dd00::/32 | 4.3B × /64 | 63/64 |
| 2605:dd00:8000::/48 | 65.5k × /64 | 26/64 |
Routing health
How AS231'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
- Valid33.3%3
- Invalid0.0%0
- No ROA66.7%6
Propagation
- Globally propagated90% of full-feed peers or more77.8%7
- Partially propagated40% to 90%22.2%2
- Seen by few peersUnder 40%0.0%0
Prefix sizes
IPv4 — 7 prefixes
IPv6 — 2 prefixes
- /324.3B × /6450.0%1
- /4865.5k × /6450.0%1
Recent changes
Announcements that started or stopped since 23rd Sept 2026.
No announcement by AS231 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.