AS4221United States Department of Defense (DoD)
United StatesRegistryARINAt a glance
IPv4 prefixes
0
IPv6 prefixes
2
IPv4 addresses
0
IPv6 /64s
131k
Upstream graph
The networks AS4221 is seen behind, one and two hops out, drawn from real AS paths.
AS4221Toward the internet core
Networks observed one and two hops upstream of AS4221 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.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS668DoD High Performance Computing (Defense Research and Engineering Network) | US | Peer | 124 | 62 |
Prefixes
The largest blocks AS4221 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 2001:480:52::/48 | 65.5k × /64 | 62/62 |
| 2001:480:95::/48 | 65.5k × /64 | 62/62 |
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.