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
- Enterprise allocation +4
- Trust score 69 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →AS57728 — global IP footprint
Cities where AS57728 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 188.122.192.0/19 | 8.2K |
95.9%
|
CEZNET s.r.o. | CZ | Hradec Králové Region | Hradec Králové |
| 81.25.16.0/20 | 4.1K |
9.9%
|
CEZNET s.r.o. | CZ | Liberec Region | Liberec |
| 109.234.40.0/21 | 2.0K |
1.1%
|
CEZNET s.r.o. | CZ | Central Bohemia | Mladá Boleslav |
| 185.255.116.0/22 | 1.0K |
83.1%
|
CEZNET s.r.o. | CZ | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS57728 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 |
|---|---|---|
| 81.25.24.0/21 | 6,342 | 2026-07-26 13:31:57 |
| 81.25.16.0/21 | 6,143 | 2026-07-26 13:31:57 |
| 185.255.116.0/22 | 6,065 | 2026-07-26 13:32:16 |
| 188.122.192.0/19 | 5,957 | 2026-07-26 13:32:16 |
| 109.234.40.0/21 | 5,915 | 2026-07-26 13:31:57 |
Frequently Asked Questions
What is AS57728?
AS57728 is an Autonomous System Number assigned to CEZNET s.r.o.. 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 AS57728 announce?
AS57728 announces 15.4K IPv4 addresses distributed across 4 routed CIDR prefixes. The network is registered in Czechia.
Who operates AS57728?
AS57728 is operated by CEZNET s.r.o.. The organization is based in Czechia. You can view all IP ranges and related ASNs on the organization page.
What country is AS57728 registered in?
AS57728 is registered in Czechia. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
