AS103
Northwestern University
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 Northwestern University
Northwestern University (NU) is a private research university in Evanston, Illinois, United States. Established in 1851, it is the oldest chartered university in Illinois.
Network profile
Source: PeeringDB →AS103 — global IP footprint
Cities where AS103 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS103 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 |
|---|---|---|
| 199.249.167.0/24 | 14,046 | 2026-07-23 17:51:26 |
| 199.249.168.0/24 | 13,789 | 2026-07-23 17:51:26 |
| 199.249.169.0/24 | 13,776 | 2026-07-23 17:51:26 |
| 8.30.248.0/22 | 6,249 | 2026-07-23 17:53:19 |
| 8.28.178.0/23 | 6,212 | 2026-07-23 17:53:19 |
| 38.124.97.0/24 | 5,870 | 2026-07-23 17:53:19 |
| 165.124.240.0/20 | 5,671 | 2026-07-23 17:53:19 |
| 165.124.192.0/19 | 5,662 | 2026-07-23 17:53:19 |
| 165.124.0.0/17 | 5,661 | 2026-07-23 17:53:19 |
| 165.124.128.0/19 | 5,659 | 2026-07-23 17:53:19 |
| 165.124.160.0/20 | 5,659 | 2026-07-23 17:53:19 |
| 165.124.232.0/22 | 5,655 | 2026-07-23 17:53:19 |
| 165.124.224.0/21 | 5,643 | 2026-07-23 17:53:19 |
| 199.74.64.0/18 | 5,639 | 2026-07-23 17:53:19 |
| 129.105.0.0/16 | 5,638 | 2026-07-23 17:53:19 |
| 165.124.176.0/21 | 5,631 | 2026-07-23 17:53:19 |
| 165.124.186.0/24 | 5,203 | 2026-07-23 17:53:19 |
| 165.124.184.0/23 | 5,202 | 2026-07-23 17:53:19 |
| 192.26.86.0/23 | 4,491 | 2026-07-23 17:53:19 |
| 199.249.168.0/23 | 4,476 | 2026-07-23 17:53:19 |
| 199.249.166.0/23 | 4,464 | 2026-07-23 17:53:19 |
| 192.31.253.0/24 | 4,447 | 2026-07-23 17:53:19 |
| 192.26.85.0/24 | 4,440 | 2026-07-23 17:53:19 |
| 192.5.143.0/24 | 4,402 | 2026-07-23 17:53:19 |
| 199.249.165.0/24 | 4,368 | 2026-07-23 17:53:19 |
| 165.124.17.0/24 | 3,461 | 2026-07-23 17:51:26 |
| 165.124.149.0/24 | 3,386 | 2026-07-23 17:51:26 |
| 199.249.166.0/24 | 3,273 | 2026-07-23 17:51:26 |
Frequently Asked Questions
What is AS103?
AS103 is an Autonomous System Number assigned to Northwestern 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 AS103 announce?
AS103 announces 149.5K IPv4 addresses distributed across 22 routed CIDR prefixes. The network is registered in United States.
Who operates AS103?
AS103 is operated by Northwestern University. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS103 registered in?
AS103 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
