Spam Activity in Hosting Networks (ASNs)
September 1,2025 - November 30,2025
To see where spammed content or spambots were being hosted, we collected the IP addresses that spam domains were resolving to when spam activity was detected and added to a threat or block list. We then identified the ASN where the IP prefix containing the IP address was allocated. This number identifies the hosting network where spammed content or a spambot was reported.
In the table below, we show the twenty hosting networks with the highest numbers of reports of spammed content or spambots. Complete lists of ASNs reported for the period can be downloaded in CSV format from the Records page.
Ranking of Hosting Networks (ASNs) by Hosted Spammed Content or Spambots (September to November 2025)
| Rank | AS Name | AS number | # Routed IPv4 Addresses |
# of Spammed Content or Spambot Hosts ▼ |
Spam Score |
| 1 | Cloudflare, Inc. | 13335 | 1,405,696 | 658,549 | 4,684.9 |
| 2 | Amazon.com, Inc. | 16509 | 201,312,256 | 235,137 | 11.7 |
| 3 | CTG Server Limited | 152194 | 1,041,664 | 152,329 | 1,462.4 |
| 4 | Alibaba (US) Technology Co., Ltd. | 45102 | 7,673,600 | 142,756 | 186.0 |
| 5 | CNSERVERS LLC | 40065 | 1,389,568 | 132,143 | 951.0 |
| 6 | POWER LINE (HK) CO., LIMITED | 132839 | 1,139,200 | 106,404 | 934.0 |
| 7 | DingFeng XinHui(HongKong) Technology Limited | 134548 | 1,467,904 | 91,692 | 624.7 |
| 8 | Microsoft Corporation | 8075 | 66,551,552 | 84,689 | 12.7 |
| 9 | Cloudflare London, LLC | 209242 | 125,952 | 73,697 | 5,851.2 |
| 10 | HENGDA NETWORK LIMITED | 138415 | 356,608 | 67,550 | 1,894.2 |
| 11 | Dimension Network & Communication Limited | 59371 | 134,656 | 63,377 | 4,706.6 |
| 12 | PEG TECH INC | 398478 | 174,080 | 60,197 | 3,458.0 |
| 13 | GNET INC. | 9294 | 292,864 | 53,545 | 1,828.3 |
| 14 | OVH SAS | 16276 | 4,715,776 | 49,309 | 104.6 |
| 15 | Google LLC | 396982 | 54,314,240 | 47,130 | 8.7 |
| 16 | Netsec Limited | 45753 | 111,104 | 46,197 | 4,158.0 |
| 17 | Clayer Limited | 137951 | 413,952 | 44,826 | 1,082.9 |
| 18 | PEG TECH INC | 54600 | 1,144,064 | 44,598 | 389.8 |
| 19 | PEG TECH INC | 398823 | 338,688 | 37,795 | 1,115.9 |
| 20 | cognetcloud INC | 401696 | 63,232 | 36,139 | 5,715.3 |
To allow comparison of large and small Hosting Networks (ASNs), we also rank Hosting Networks based on a metric, hosting network spam score, which is calculated by dividing the number of spammed content or spambot hosts reported against an ASN by the number of routable IPv4 addresses allocated to that ASN.
Hosting (ASN) Spam Score = (number of spammed content or spambot hosts /IP Addresses in ASN) * 10,000
In the table below, we show the top 20 hosting operators based on spam score.
Ranking of Hosting Networks (ASNs) by Hosted Content/Spambot Score (September to November 2025)
Hosting Networks (ASNs) with a minimum of 50,000 IPv4 addresses and 25 spam attacks
| Rank | AS Name | AS number | # Routed IPv4 Addresses |
# of Spammed Content or Spambot Hosts |
Spam Score ▼ |
| 1 | Cloudflare London, LLC | 209242 | 125,952 | 73,697 | 5,851.2 |
| 2 | cognetcloud INC | 401696 | 63,232 | 36,139 | 5,715.3 |
| 3 | Dimension Network & Communication Limited | 59371 | 134,656 | 63,377 | 4,706.6 |
| 4 | Cloudflare, Inc. | 13335 | 1,405,696 | 658,549 | 4,684.9 |
| 5 | Netsec Limited | 45753 | 111,104 | 46,197 | 4,158.0 |
| 6 | PEG TECH INC | 398478 | 174,080 | 60,197 | 3,458.0 |
| 7 | Forewin Telecom Group Limited | 38186 | 68,352 | 20,233 | 2,960.1 |
| 8 | Antbox Networks Limited | 138995 | 75,264 | 21,074 | 2,800.0 |
| 9 | HENGDA NETWORK LIMITED | 138415 | 356,608 | 67,550 | 1,894.2 |
| 10 | GNET INC. | 9294 | 292,864 | 53,545 | 1,828.3 |
| 11 | Tcloudnet | 399077 | 131,712 | 23,783 | 1,805.7 |
| 12 | Hong Kong Communications International Co., Limited | 140227 | 66,048 | 10,867 | 1,645.3 |
| 13 | ASN block not managed by the RIPE NCC | 8796 | 203,776 | 33,379 | 1,638.0 |
| 14 | CTG Server Limited | 152194 | 1,041,664 | 152,329 | 1,462.4 |
| 15 | NetLab Global | 979 | 83,456 | 10,290 | 1,233.0 |
| 16 | XNNET LLC | 932 | 78,336 | 8,815 | 1,125.3 |
| 17 | PEG TECH INC | 398823 | 338,688 | 37,795 | 1,115.9 |
| 18 | Clayer Limited | 137951 | 413,952 | 44,826 | 1,082.9 |
| 19 | Zillion Network Inc. | 54801 | 293,632 | 31,590 | 1,075.8 |
| 20 | CNSERVERS LLC | 40065 | 1,389,568 | 132,143 | 951.0 |
| Quarterly Update: Key Statistics |
Quarterly Update: Top Level Domains |
Quarterly Update: Registrars |
Quarterly Update: Hosting Networks |
| Quarter over Quarter: Hosting Networks |