Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Academic allocation +6
- Trust score 71 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
About Carnegie Mellon University
Carnegie Mellon University (CMU) is a private research university in Pittsburgh, Pennsylvania, United States. The institution was established in 1900 by Andrew Carnegie as the Carnegie Technical Schools.
Network profile
Source: PeeringDB →Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 128.2.0.0/16 | 65.5K |
26.7%
|
Carnegie Mellon University | US | Pennsylvania | Pittsburgh |
| 128.237.0.0/16 | 65.5K |
2.4%
|
Carnegie Mellon University | US | Pennsylvania | Pittsburgh |
| 204.194.28.0/22 | 1.0K |
0.7%
|
Carnegie Mellon University | US | — | — |
| 209.129.244.0/23 | 512 |
7.4%
|
Carnegie Mellon University | US | — | — |
| 103.107.252.0/24 | 256 |
95.3%
|
ATOS IT Solutions and Services, Inc. | IN | — | — |
| 192.5.146.0/24 | 256 |
0.0%
|
Carnegie Mellon University | US | — | — |
| 192.12.32.0/24 | 256 |
2.7%
|
Carnegie Mellon University | US | — | — |
| 192.58.107.0/24 | 256 |
0.0%
|
Carnegie Mellon University | US | — | — |
| 192.80.210.0/24 | 256 |
0.0%
|
Carnegie Mellon University | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS9 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 209.129.244.0/23 | 5,217 | 2026-07-18 16:32:12 |
| 128.237.0.0/16 | 4,489 | 2026-07-18 17:30:21 |
| 128.2.0.0/16 | 4,487 | 2026-07-18 17:30:20 |
| 192.5.146.0/24 | 4,447 | 2026-07-18 17:30:21 |
| 192.80.210.0/24 | 4,444 | 2026-07-18 17:30:20 |
| 192.12.32.0/24 | 4,439 | 2026-07-18 17:30:19 |
| 192.58.107.0/24 | 4,431 | 2026-07-18 17:30:23 |
| 204.194.28.0/22 | 4,418 | 2026-07-18 17:30:26 |
| 147.72.252.0/22 | 383 | 2026-07-18 04:14:46 |
Frequently Asked Questions
What is AS9?
AS9 is an Autonomous System Number assigned to Carnegie Mellon University. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS9 announce?
AS9 announces 133.9K IPv4 addresses distributed across 9 routed CIDR prefixes. The network is registered in United States.
Who operates AS9?
AS9 is operated by Carnegie Mellon University. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS9 registered in?
AS9 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
