Spam Activity in Hosting Networks (ASNs)
March 1,2025 - May 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 (March to May 2025)

Rank AS Name AS number # Routed
IPv4 Addresses		 # of Spammed Content
or Spambot Hosts ▼		 Spam Score
1 Trellian Pty. Limited 133618 1,024 516,182 5,040,839.8
2 Cloudflare, Inc. 13335 2,735,360 317,004 1,158.9
3 CTG Server Limited 152194 1,006,336 186,043 1,848.7
4 Dimension Network & Communication Limited 59371 79,104 180,870 22,864.8
5 Amazon.com, Inc. 16509 214,946,048 164,906 7.7
6 Google LLC 15169 2,501,632 134,915 539.3
7 Alibaba (US) Technology Co., Ltd. 45102 6,688,000 110,598 165.4
8 Microsoft Corporation 8075 66,537,984 93,291 14.0
9 CNSERVERS LLC 40065 1,301,248 83,179 639.2
10 HENGDA NETWORK LIMITED 138415 310,528 81,238 2,616.1
11 Clayer Limited 137951 420,352 77,814 1,851.2
12 POWER LINE (HK) CO., LIMITED 132839 770,304 63,423 823.4
13 OVH SAS 16276 4,521,984 61,598 136.2
14 Netsec Limited 45753 121,600 56,620 4,656.3
15 Shenzhen Tencent Computer Systems Company Limited 132203 2,707,200 55,582 205.3
16 Cloudie Limited 55933 428,288 55,161 1,287.9
17 PEG TECH INC 54600 1,256,192 39,820 317.0
18 Google LLC 396982 48,680,448 34,358 7.1
19 Tcloudnet 399077 141,952 34,224 2,411.0
20 DingFeng XinHui(HongKong) Technology Limited 134548 1,246,720 31,229 250.5

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 Spam Attack Score (March to May 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 79,104 180,870 22,864.8
2 Netsec Limited 45753 121,600 56,620 4,656.3
3 SonderCloud Limited 133199 67,584 24,987 3,697.2
4 HENGDA NETWORK LIMITED 138415 310,528 81,238 2,616.1
5 Tcloudnet 399077 141,952 34,224 2,411.0
6 Cloudflare London, LLC 209242 129,792 30,903 2,381.0
7 Hong Kong Communications International Co., Limited 140227 64,768 14,915 2,302.8
8 Clayer Limited 137951 420,352 77,814 1,851.2
9 CTG Server Limited 152194 1,006,336 186,043 1,848.7
10 Antbox Networks Limited 138995 73,472 13,063 1,778.0
11 PEG TECH INC 398478 156,928 25,320 1,613.5
12 NetLab Global 979 63,488 10,196 1,606.0
13 NForce Entertainment B.V. 43350 65,792 9,480 1,440.9
14 XNNET LLC 932 78,848 10,387 1,317.3
15 Cloudie Limited 55933 428,288 55,161 1,287.9
16 Cloudflare, Inc. 13335 2,735,360 317,004 1,158.9
17 GNET INC. 9294 240,896 23,378 970.5
18 PEG TECH INC 398993 67,328 6,270 931.3
19 POWER LINE (HK) CO., LIMITED 132839 770,304 63,423 823.4
20 Forewin Telecom Group Limited 38186 60,160 4,529 752.8

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