Spam Activity in Hosting Networks (ASNs)
June 1,2025 - August 31,2025

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 (June to August 2025)

Rank AS Name AS number # Routed
IPv4 Addresses		 # of Spammed Content
or Spambot Hosts ▼		 Spam Score
1 Cloudflare, Inc. 13335 1,374,976 390,973 2,843.5
2 Amazon.com, Inc. 16509 216,063,488 181,204 8.4
3 Google LLC 15169 2,501,888 113,660 454.3
4 CNSERVERS LLC 40065 1,396,480 104,151 745.8
5 CTG Server Limited 152194 1,011,456 94,234 931.7
6 Alibaba (US) Technology Co., Ltd. 45102 6,832,128 90,332 132.2
7 Microsoft Corporation 8075 66,556,160 85,714 12.9
8 DingFeng XinHui(HongKong) Technology Limited 134548 1,423,872 81,957 575.6
9 POWER LINE (HK) CO., LIMITED 132839 849,920 79,944 940.6
10 PEG TECH INC 398478 161,024 63,944 3,971.1
11 Dimension Network & Communication Limited 59371 77,568 61,406 7,916.4
12 HENGDA NETWORK LIMITED 138415 422,912 54,059 1,278.3
13 Cloudflare London, LLC 209242 128,512 51,112 3,977.2
14 Netsec Limited 45753 113,664 46,449 4,086.5
15 FranTech Solutions 53667 46,080 41,699 9,049.3
16 Tcloudnet 399077 147,584 40,694 2,757.3
17 Shenzhen Tencent Computer Systems Company Limited 132203 2,709,248 40,086 148.0
18 Google LLC 396982 48,932,096 39,475 8.1
19 DingFeng XinHui(HongKong) Technology Limited 134175 177,920 39,393 2,214.1
20 OVH SAS 16276 4,569,088 39,062 85.5

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 (June to August 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 Dimension Network & Communication Limited 59371 77,568 61,406 7,916.4
2 Netsec Limited 45753 113,664 46,449 4,086.5
3 Cloudflare London, LLC 209242 128,512 51,112 3,977.2
4 PEG TECH INC 398478 161,024 63,944 3,971.1
5 Cloudflare, Inc. 13335 1,374,976 390,973 2,843.5
6 Tcloudnet 399077 147,584 40,694 2,757.3
7 DingFeng XinHui(HongKong) Technology Limited 134175 177,920 39,393 2,214.1
8 Antbox Networks Limited 138995 73,984 11,339 1,532.6
9 STARCLOUD GLOBAL PTE., LTD. 140224 159,232 23,987 1,506.4
10 HENGDA NETWORK LIMITED 138415 422,912 54,059 1,278.3
11 Hong Kong Communications International Co., Limited 140227 65,792 8,148 1,238.5
12 SonderCloud Limited 133199 269,056 32,660 1,213.9
13 Kaopu Cloud HK Limited 138915 173,568 19,420 1,118.9
14 OWGELS INTERNATIONAL CO., LIMITED 139880 165,376 18,381 1,111.5
15 WorldStream B.V. 49981 68,864 7,611 1,105.2
16 cognetcloud INC 401696 73,216 7,417 1,013.0
17 ASN block not managed by the RIPE NCC 8796 201,728 19,357 959.6
18 POWER LINE (HK) CO., LIMITED 132839 849,920 79,944 940.6
19 CTG Server Limited 152194 1,011,456 94,234 931.7
20 NetLab Global 979 78,592 7,070 899.6

Quarterly Update:
Key Statistics		 Quarterly Update:
Top Level Domains		 Quarterly Update:
Registrars		 Quarterly Update:
Hosting Networks
Quarter over Quarter:
Hosting Networks