Spam Activity in Hosting Networks (ASNs)
December 1,2024 - February 28,2025

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 (December to February 2025)

Rank AS Name AS number # Routed
IPv4 Addresses		 # of Spammed Content
or Spambot Hosts ▼		 Spam Score
1 Amazon.com, Inc. 16509 208,388,864 841,925 40.4
2 Cloudflare, Inc. 13335 2,611,712 337,708 1,293.1
3 CTG Server Limited 152194 1,007,104 259,690 2,578.6
4 Google LLC 15169 12,043,264 165,258 137.2
5 Dimension Network & Communication Limited 59371 79,104 135,747 17,160.6
6 Alibaba (US) Technology Co., Ltd. 45102 6,104,320 134,834 220.9
7 CNSERVERS LLC 40065 1,322,241 103,769 784.8
8 Microsoft Corporation 8075 66,624,256 99,880 15.0
9 Cloudflare London, LLC 209242 129,536 94,345 7,283.3
10 Simple Carrier LLC 42624 2,304 77,366 335,789.9
11 Clayer Limited 137951 907,520 76,361 841.4
12 Trellian Pty. Limited 133618 1,024 75,982 742,011.7
13 DigitalOcean, LLC 14061 2,986,752 71,304 238.7
14 OVH SAS 16276 4,480,000 60,189 134.4
15 HENGDA NETWORK LIMITED 138415 275,456 51,233 1,859.9
16 Google LLC 396982 38,942,976 49,227 12.6
17 Shenzhen Tencent Computer Systems Company Limited 132203 2,747,392 43,329 157.7
18 PEG TECH INC 54600 1,054,464 42,568 403.7
19 Netsec Limited 45753 200,448 41,051 2,048.0
20 CenturyLink Communications, LLC 3561 11,047,168 39,497 35.8

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 (December to February 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 79,104 135,747 17,160.6
2 Cloudflare London, LLC 209242 129,536 94,345 7,283.3
3 NForce Entertainment B.V. 43350 66,048 28,591 4,328.8
4 SonderCloud Limited 133199 68,096 20,567 3,020.3
5 UpCloud Ltd 202053 60,928 17,122 2,810.2
6 CTG Server Limited 152194 1,007,104 259,690 2,578.6
7 Netsec Limited 45753 200,448 41,051 2,048.0
8 HENGDA NETWORK LIMITED 138415 275,456 51,233 1,859.9
9 Leaseweb USA, Inc. 30633 144,128 26,628 1,847.5
10 Antbox Networks Limited 138995 57,856 10,249 1,771.5
11 Cloudflare, Inc. 13335 2,611,712 337,708 1,293.1
12 PEG TECH INC 398478 133,888 16,840 1,257.8
13 Hong Kong Communications International Co., Limited 140227 57,344 6,880 1,199.8
14 Cloudie Limited 55933 289,792 34,381 1,186.4
15 STARCLOUD GLOBAL PTE., LTD. 140224 197,120 22,880 1,160.7
16 GTHost 63023 54,016 5,591 1,035.1
17 NetLab Global 979 54,272 5,442 1,002.7
18 Gigabit Hosting Sdn Bhd 55720 82,432 7,300 885.6
19 BGP Consultancy Pte Ltd 64050 84,736 7,288 860.1
20 Clayer Limited 137951 907,520 76,361 841.4

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