AS91
Rensselaer Polytechnic Institute
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 Rensselaer Polytechnic Institute
Rensselaer Polytechnic Institute, a private research-university in Troy, New York, United States, is the oldest technological university in the English-speaking world and in the Western Hemisphere. Stephen Van Rensselaer and Amos Eaton established RPI in 1824 for the "application of science to the common purposes of life".
Network profile
Source: PeeringDB →AS91 — global IP footprint
Cities where AS91 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 |
|---|---|---|---|---|---|---|
| 128.113.0.0/16 | 65.5K |
44.1%
|
Rensselaer Polytechnic Institute | US | New York | Saratoga Springs |
| 128.213.0.0/16 | 65.5K |
12.7%
|
Rensselaer Polytechnic Institute | US | New York | Troy |
| 129.5.0.0/16 | 65.5K |
0.0%
|
Rensselaer Polytechnic Institute | US | — | — |
| 129.161.0.0/16 | 65.5K |
60.6%
|
Rensselaer Polytechnic Institute | US | New York | Troy |
| 146.8.0.0/16 | 65.5K |
0.0%
|
Rensselaer Polytechnic Institute | US | — | — |
| 204.76.224.0/22 | 1.0K |
0.0%
|
Rensselaer Polytechnic Institute | US | — | — |
| 204.76.222.0/23 | 512 |
43.4%
|
Rensselaer Polytechnic Institute | US | — | — |
| 204.76.228.0/23 | 512 |
0.0%
|
Rensselaer Polytechnic Institute | US | — | — |
| 192.12.91.0/24 | 256 |
0.0%
|
Rensselaer Polytechnic Institute | US | — | — |
| 192.12.92.0/24 | 256 |
0.0%
|
Rensselaer Polytechnic Institute | US | — | — |
| 204.145.205.0/24 | 256 |
0.0%
|
Rensselaer Polytechnic Institute | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS91 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 |
|---|---|---|
| 204.76.222.0/24 | 9,141 | 2026-07-23 14:25:56 |
| 129.161.0.0/16 | 6,238 | 2026-07-23 14:23:20 |
| 128.113.0.0/16 | 6,237 | 2026-07-23 14:23:20 |
| 128.213.0.0/16 | 6,231 | 2026-07-23 14:23:20 |
| 204.145.205.0/24 | 6,160 | 2026-07-23 14:25:57 |
| 204.76.223.0/24 | 6,145 | 2026-07-23 14:25:56 |
| 146.8.0.0/16 | 6,136 | 2026-07-23 14:23:25 |
| 204.76.228.0/23 | 6,134 | 2026-07-23 14:25:56 |
| 204.76.224.0/22 | 6,106 | 2026-07-23 14:25:56 |
| 129.5.0.0/16 | 4,730 | 2026-07-23 14:23:20 |
| 192.12.92.0/24 | 4,699 | 2026-07-23 14:24:32 |
| 192.12.91.0/24 | 4,696 | 2026-07-23 14:24:32 |
Frequently Asked Questions
What is AS91?
AS91 is an Autonomous System Number assigned to Rensselaer Polytechnic Institute. 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 AS91 announce?
AS91 announces 330.5K IPv4 addresses distributed across 11 routed CIDR prefixes. The network is registered in United States.
Who operates AS91?
AS91 is operated by Rensselaer Polytechnic Institute. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS91 registered in?
AS91 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
