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
- Trust score 65 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 146.109.160.0/19 | 8.2K |
0.0%
|
SIX Swiss Exchange AG | CH | Zurich | Zurich |
| 146.109.145.0/24 | 256 |
0.4%
|
SIX Swiss Exchange AG | CH | Zurich | Zurich |
| 146.109.153.0/24 | 256 |
0.4%
|
SIX Swiss Exchange AG | CH | Zurich | Zurich |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS20743 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 |
|---|---|---|
| 146.109.153.0/24 | 30,254 | 2026-07-31 17:07:37 |
| 146.109.161.0/24 | 19,203 | 2026-07-31 17:07:24 |
| 146.109.145.0/24 | 19,194 | 2026-07-31 17:06:18 |
| 146.109.160.0/19 | 18,788 | 2026-07-31 17:07:24 |
Frequently Asked Questions
What is AS20743?
AS20743 is an Autonomous System Number assigned to SIX Swiss Exchange AG. 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 AS20743 announce?
AS20743 announces 8.7K IPv4 addresses distributed across 3 routed CIDR prefixes. The network is registered in Switzerland.
Who operates AS20743?
AS20743 is operated by SIX Swiss Exchange AG. The organization is based in Switzerland. You can view all IP ranges and related ASNs on the organization page.
What country is AS20743 registered in?
AS20743 is registered in Switzerland. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
