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 →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 134.95.0.0/16 | 65.5K |
35.7%
|
Universitaet zu Koeln | DE | North Rhine-Westphalia | Cologne |
| 185.240.116.0/22 | 1.0K |
0.0%
|
Universitaet zu Koeln | DE | — | — |
| 134.107.216.0/23 | 512 |
3.7%
|
Universitaet zu Koeln | DE | — | — |
| 134.107.226.0/23 | 512 |
0.2%
|
Universitaet zu Koeln | DE | — | — |
| 134.107.209.0/24 | 256 |
12.5%
|
Universitaet zu Koeln | DE | — | — |
| 134.107.225.0/24 | 256 |
2.3%
|
Universitaet zu Koeln | DE | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS5520 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 |
|---|---|---|
| 134.95.0.0/16 | 13,171 | 2026-07-23 15:47:24 |
| 185.240.116.0/22 | 13,110 | 2026-07-23 15:47:24 |
| 134.107.216.0/23 | 13,060 | 2026-07-23 15:47:24 |
| 134.107.209.0/24 | 13,058 | 2026-07-23 15:47:24 |
| 134.107.225.0/24 | 13,050 | 2026-07-23 15:47:24 |
| 134.107.226.0/23 | 13,047 | 2026-07-23 15:47:24 |
Frequently Asked Questions
What is AS5520?
AS5520 is an Autonomous System Number assigned to Universitaet zu Koeln. 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 AS5520 announce?
AS5520 announces 68.1K IPv4 addresses distributed across 6 routed CIDR prefixes. The network is registered in Germany.
Who operates AS5520?
AS5520 is operated by Universitaet zu Koeln. The organization is based in Germany. You can view all IP ranges and related ASNs on the organization page.
What country is AS5520 registered in?
AS5520 is registered in Germany. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
