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 v1.2.1 — a transparent heuristic, not a definitive verdict. How it works →
About Seznam.cz
Seznam.cz is a Czech technology company that operates an internet portal, search engine, digital advertising platform, mapping service, media services, and online marketplaces. Founded in 1996 by Ivo Lukačovič in Prague, it began as an internet directory and search service and later expanded into a broader digital ecosystem.
Network profile
Source: PeeringDB →Present at 3 internet exchanges: NIX.CZ: Public peering VLAN, NIX.CZ FENIX: FENIX VLAN, DE-CIX Frankfurt: DE-CIX Frankfurt Peering LAN
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 77.75.72.0/21 | 2.0K |
20.6%
|
Seznam.cz, a.s. | CZ | Prague | Prague |
| 185.66.188.0/22 | 1.0K |
2.1%
|
Seznam.cz, a.s. | CZ | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS43037 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 |
|---|---|---|
| 185.66.188.0/22 | 17,006 | 2026-10-14 21:31:24 |
| 77.75.75.0/24 | 16,930 | 2026-10-14 21:30:18 |
| 77.75.76.0/23 | 16,874 | 2026-10-14 21:30:22 |
| 77.75.72.0/23 | 16,748 | 2026-10-14 21:31:31 |
| 77.75.78.0/23 | 16,656 | 2026-10-14 21:31:31 |
| 77.75.74.0/24 | 16,594 | 2026-10-14 21:31:31 |
Frequently Asked Questions
What is AS43037?
AS43037 is an Autonomous System Number assigned to Seznam.cz, a.s.. 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 AS43037 announce?
AS43037 announces 3.1K IPv4 addresses distributed across 2 routed CIDR prefixes. The network is registered in Czechia.
Who operates AS43037?
AS43037 is operated by Seznam.cz, a.s.. The organization is based in Czechia. You can view all IP ranges and related ASNs on the organization page.
What country is AS43037 registered in?
AS43037 is registered in Czechia. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
