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
- Multiple-origin (MOAS) routing anomaly −12
- Academic allocation +6
- Trust score 59 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
About University of Delaware
The University of Delaware is a privately governed, state-assisted land-grant research university in Newark, Delaware, United States. UD offers 4 associate programs, 163 bachelor's programs, 136 master's programs, and 64 doctoral programs across its ten colleges and schools.
⚠ 6 MOAS prefixes — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS2 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 196.13.136.0/24 | AS2, AS327753 | 2026-07-18 11:22:44 |
| 194.190.54.0/24 | AS2, AS203794 | 2026-07-18 11:22:44 |
| 194.190.53.0/24 | AS2, AS203794 | 2026-07-18 11:22:44 |
| 129.205.64.0/20 | AS2, AS37628 | 2026-07-18 11:22:44 |
| 189.39.185.0/24 | AS2, AS270792 | 2026-07-17 19:22:38 |
| 189.76.77.0/24 | AS2, AS52752 | 2026-07-17 19:22:38 |
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 128.4.0.0/16 | 65.5K |
92.5%
|
University of Delaware | US | Delaware | Newark |
| 171.79.128.0/19 | 8.2K |
0.0%
|
University of Delaware | IN | Rajasthan | Jaipur |
| 91.143.144.0/20 | 4.1K |
0.2%
|
University of Delaware | RU | — | — |
| 91.143.148.0/22 | 1.0K |
0.0%
|
— | RU | — | — |
| 91.143.156.0/22 | 1.0K |
0.0%
|
— | RU | — | — |
| 91.143.146.0/23 | 512 |
0.0%
|
— | RU | — | — |
| 91.143.152.0/23 | 512 |
0.0%
|
— | US | — | — |
| 45.161.25.0/24 | 256 |
0.0%
|
University of Delaware | SV | San Salvador Department | San Salvador |
| 91.143.144.0/24 | 256 |
0.0%
|
— | RU | — | — |
| 91.143.145.0/24 | 256 |
0.0%
|
— | US | — | — |
| 91.143.154.0/24 | 256 |
0.0%
|
— | US | — | — |
| 91.143.155.0/24 | 256 |
0.0%
|
— | RU | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS2 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 |
|---|---|---|
| 171.79.128.0/20 | 49,286 | 2026-07-18 10:54:41 |
| 171.79.144.0/20 | 49,244 | 2026-07-18 10:54:41 |
| 189.76.77.0/24 | 19,265 | 2026-07-18 09:35:10 |
| 128.4.0.0/16 | 8,981 | 2026-07-18 10:52:25 |
| 189.39.185.0/24 | 8,358 | 2026-07-18 10:53:02 |
| 45.228.74.0/24 | 5,168 | 2026-06-26 23:18:02 |
| 45.228.75.0/24 | 5,167 | 2026-06-26 23:18:02 |
| 91.143.144.0/20 | 4,666 | 2026-07-18 11:03:23 |
| 194.190.54.0/24 | 4,483 | 2026-07-18 07:21:28 |
| 194.190.53.0/24 | 4,482 | 2026-07-18 07:21:28 |
| 45.161.25.0/24 | 3,791 | 2026-07-18 10:52:09 |
| 103.39.120.0/23 | 3,294 | 2026-07-18 10:12:36 |
| 189.39.184.0/24 | 2,232 | 2026-07-02 13:14:33 |
| 103.195.255.0/24 | 1,966 | 2026-06-05 04:05:34 |
| 124.6.227.0/24 | 1,477 | 2026-05-31 11:01:32 |
| 124.6.229.0/24 | 1,474 | 2026-05-31 11:01:32 |
| 124.6.233.0/24 | 1,470 | 2026-05-31 11:01:32 |
| 124.6.232.0/24 | 1,219 | 2026-05-31 11:01:32 |
| 124.6.237.0/24 | 1,136 | 2026-05-31 11:01:32 |
| 124.6.226.0/24 | 1,134 | 2026-05-31 11:01:32 |
| 124.6.239.0/24 | 1,134 | 2026-05-31 11:01:32 |
| 124.6.228.0/24 | 1,132 | 2026-05-31 11:01:32 |
| 124.6.224.0/24 | 1,131 | 2026-05-31 11:01:32 |
| 124.6.236.0/24 | 1,127 | 2026-05-31 11:01:32 |
| 124.6.235.0/24 | 1,117 | 2026-05-31 11:01:32 |
| 204.58.206.0/23 | 1,013 | 2026-06-14 11:41:55 |
| 124.6.234.0/24 | 627 | 2026-05-31 11:01:32 |
| 124.6.225.0/24 | 491 | 2026-05-30 12:29:42 |
| 124.6.230.0/24 | 489 | 2026-05-30 12:29:42 |
| 45.168.187.0/24 | 410 | 2026-06-10 15:25:36 |
| 154.65.12.0/22 | 338 | 2026-07-18 04:12:44 |
| 185.175.65.0/24 | 194 | 2026-07-15 09:39:37 |
| 45.228.73.0/24 | 190 | 2026-06-26 23:18:02 |
| 164.163.138.0/24 | 165 | 2026-07-12 02:44:15 |
| 45.228.72.0/22 | 100 | 2026-06-26 19:42:56 |
| 45.228.72.0/24 | 91 | 2026-06-26 19:42:59 |
| 129.205.64.0/20 | 51 | 2026-07-18 04:12:44 |
| 45.234.11.0/24 | 28 | 2026-06-17 01:25:26 |
| 163.223.60.0/24 | 25 | 2026-07-12 04:26:59 |
| 163.223.61.0/24 | 25 | 2026-07-12 04:26:59 |
| 154.64.35.0/24 | 25 | 2026-07-10 02:32:42 |
| 196.13.136.0/24 | 24 | 2026-07-18 07:04:21 |
| 103.167.70.0/23 | 21 | 2026-07-06 20:52:32 |
| 138.117.46.0/24 | 11 | 2026-07-14 20:15:56 |
| 138.117.47.0/24 | 11 | 2026-07-14 20:15:56 |
| 138.117.46.0/23 | 11 | 2026-07-14 20:15:56 |
| 201.159.75.0/24 | 4 | 2026-07-06 11:53:09 |
| 201.159.78.0/24 | 3 | 2026-07-06 00:18:16 |
| 201.159.72.0/24 | 3 | 2026-07-06 03:09:24 |
| 201.159.79.0/24 | 3 | 2026-07-06 00:18:16 |
Showing top 50 of 65 announced prefixes by sample volume.
Frequently Asked Questions
What is AS2?
AS2 is an Autonomous System Number assigned to University of Delaware. 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 AS2 announce?
AS2 announces 78.1K IPv4 addresses distributed across 4 routed CIDR prefixes. The network is registered in United States.
Who operates AS2?
AS2 is operated by University of Delaware. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS2 registered in?
AS2 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
