AS21965Highmark Inc
United StatesRegistryARINAt a glance
IPv4 prefixes
22
IPv6 prefixes
0
IPv4 addresses
5.6k
IPv6 /64s
0
Upstream graph
The networks AS21965 is seen behind, one and two hops out, drawn from real AS paths.
AS21965Toward the internet core
Networks observed one and two hops upstream of AS21965 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
16
adjacent networks
- Upstreams
- 744%
- Peers
- 850%
- Downstreams
- 16%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS6461Zayo Bandwidth | US | Peer | 1,298 | 80 |
| AS3356Lumen (Level 3) | US | Peer | 1,091 | 79 |
| AS15830Equinix, Inc. |  NL | Peer | 563 | 79 |
| AS7018AT&T Enterprises, LLC | US | Peer | 147 | 9 |
| AS46887Zayo Bandwidth | US | Peer | 67 | 67 |
| AS7016Comcast Cable Communications, LLC | US | Peer | 13 | 13 |
| AS1000LINK AMERICAN | US | Peer | 1 | 1 |
Prefixes
The largest blocks AS21965 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 157.154.3.0/24 | 256 | 80/80 |
| 157.154.4.0/24 | 256 | 80/80 |
| 157.154.5.0/24 | 256 | 80/80 |
| 157.154.6.0/24 | 256 | 80/80 |
| 157.154.7.0/24 | 256 | 80/80 |
| 157.154.8.0/24 | 256 | 80/80 |
| 157.154.11.0/24 | 256 | 80/80 |
| 157.154.14.0/24 | 256 | 80/80 |
| 157.154.20.0/24 | 256 | 80/80 |
| 167.164.3.0/24 | 256 | 79/80 |
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.