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The Top 10 Worst

The World's Worst Botnet ASNs

Autonomous System Numbers (ASNs) in this chart have the highest number of detected spam-bots as listed in the Spamhaus XBL zone, sorted by ASN. See one of the below links for a definition of ASN. Most bots can be used for spam, phishing, click-fraud, DDoS and other malicious activities.

Many issues may relate to a country's bot density including technical, policy and socioeconomic factors.

Additional and more detailed statistics can be found at the Spamhaus CBL website:

CBL breakdown by ASN

CBL breakdown by ASN Traffic

CBL breakdown by ASN Infections


Source: Spamhaus (XBL) database. Data is compiled automatically every 24 hours from the XBL database using the number of currently listed bots for each network (ISP/NSP).
The 10 Worst Botnet ASNs
As of 17 May 2021 the world's worst botnet infected Autonomous System Numbers are:
1
AS4134
China Telecom (ChinaNet)
Number of Bots: 570416

2
AS16509
AMAZON-02
Number of Bots: 359439

3
AS45609
Bharti Airtel Ltd. AS for GPRS Service
Number of Bots: 289569

4
AS58224
Iran Telecommunication Company PJS
Number of Bots: 162761

5
AS4837
China Unicom
Number of Bots: 160881

6
AS36947
Telecom Algeria
Number of Bots: 131086

7
AS197207
Mobile Communication Company of Iran PLC
Number of Bots: 117338

8
AS7713
PT Telekomunikasi Indonesia
Number of Bots: 107459

9
AS45271
Idea Cellular Limited
Number of Bots: 103237

10
AS44244
Iran Cell Service and Communication Company
Number of Bots: 95866

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