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 Purdue University
Purdue University is a public land-grant research university in West Lafayette, Indiana, United States, and the flagship campus of the Purdue University system, which also includes Purdue University in Indianapolis as an ongoing expansion of the West Lafayette campus. The university was founded in 1869 after Lafayette businessman John Purdue donated land and money to establish a college of science, technology, and agriculture; the first classes were held on September 16, 1874.
AS397501 — global IP footprint
Cities where AS397501 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 128.211.192.0/18 | 16.4K |
11.9%
|
Purdue University | US | Indiana | West Lafayette |
| 128.211.184.0/21 | 2.0K |
12.2%
|
Purdue University | US | — | — |
| 128.211.64.0/24 | 256 |
0.0%
|
Purdue University | US | — | — |
| 128.211.96.0/24 | 256 |
0.0%
|
Purdue University | US | — | — |
| 128.211.112.0/24 | 256 |
0.0%
|
Purdue University | US | — | — |
| 128.211.120.0/24 | 256 |
0.0%
|
Purdue University | US | — | — |
| 128.211.124.0/24 | 256 |
0.0%
|
Purdue University | US | — | — |
| 128.211.126.0/24 | 256 |
0.0%
|
Purdue University | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS397501 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 |
|---|---|---|
| 128.211.126.0/24 | 3,877 | 2026-07-22 09:33:20 |
| 128.211.192.0/18 | 3,874 | 2026-07-22 09:33:20 |
| 128.211.188.0/22 | 3,871 | 2026-07-22 09:33:20 |
| 128.211.124.0/24 | 3,864 | 2026-07-22 09:33:20 |
| 128.211.186.0/23 | 3,849 | 2026-07-22 09:33:20 |
| 128.211.112.0/24 | 3,843 | 2026-07-22 09:33:20 |
| 128.211.120.0/24 | 3,842 | 2026-07-22 09:33:20 |
| 128.211.184.0/23 | 3,834 | 2026-07-22 09:33:20 |
| 128.211.96.0/24 | 3,827 | 2026-07-22 09:33:20 |
| 128.211.64.0/24 | 3,825 | 2026-07-22 09:33:20 |
Frequently Asked Questions
What is AS397501?
AS397501 is an Autonomous System Number assigned to Purdue 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 AS397501 announce?
AS397501 announces 20.0K IPv4 addresses distributed across 8 routed CIDR prefixes. The network is registered in United States.
Who operates AS397501?
AS397501 is operated by Purdue University. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS397501 registered in?
AS397501 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
