AS19721Magellan Health Services
United StatesRegistryARINAt a glance
IPv4 prefixes
14
IPv6 prefixes
0
IPv4 addresses
20.2k
IPv6 /64s
0
Upstream graph
The networks AS19721 is seen behind, one and two hops out, drawn from real AS paths.
AS19721Toward the internet core
Networks observed one and two hops upstream of AS19721 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 |
|---|---|---|---|---|
| AS49915Megaport (UK) Limited |  GB | Peer | 876 | 79 |
| AS3356Lumen (Level 3) | US | Peer | 230 | 79 |
Prefixes
The largest blocks AS19721 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 204.193.64.0/19 | 8.2k | 79/80 |
| 204.193.64.0/20 | 4.1k | 79/80 |
| 204.193.80.0/20 | 4.1k | 79/80 |
| 204.193.84.0/22 | 1k | 79/80 |
| 204.193.86.0/23 | 512 | 79/80 |
| 204.193.71.0/24 | 256 | 79/80 |
| 204.193.72.0/24 | 256 | 79/80 |
| 204.193.74.0/24 | 256 | 79/80 |
| 204.193.75.0/24 | 256 | 79/80 |
| 204.193.80.0/24 | 256 | 79/80 |
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.