Spam Activity in Hosting Networks (ASNs)
March 1,2026 - May 31,2026

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 2026)

Rank AS Name AS number # Routed
IPv4 Addresses		 # of Spammed Content
or Spambot Hosts ▼		 Spam Score
1 Cloudflare, Inc. 13335 1,419,776 475,064 3,346.1
2 Amazon.com, Inc. 16509 220,199,168 109,900 5.0
3 CTG Server Limited 152194 1,136,384 100,937 888.2
4 CNSERVERS LLC 40065 1,512,960 99,379 656.9
5 BGPNET PTE. LTD. 4907 8,960 52,730 58,850.5
6 OVH SAS 16276 4,771,840 47,769 100.1
7 Alibaba (US) Technology Co., Ltd. 45102 8,275,456 45,474 55.0
8 Microsoft Corporation 8075 66,707,456 38,957 5.8
9 Cloudflare London, LLC 209242 115,712 38,037 3,287.2
10 Google LLC 396982 55,266,560 36,889 6.7
11 DingFeng XinHui(HongKong) Technology Limited 134548 1,046,784 25,881 247.2
12 Omegatech LTD 202412 5,120 25,625 50,048.8
13 POWER LINE (HK) CO., LIMITED 132839 945,152 24,681 261.1
14 Shenzhen Tencent Computer Systems Company Limited 132203 2,797,056 22,815 81.6
15 Cloudie Limited 55933 111,872 22,808 2,038.8
16 HENGDA NETWORK LIMITED 138415 301,568 20,819 690.4
17 PEG TECH INC 54600 887,552 20,018 225.5
18 DingFeng XinHui(HongKong) Technology Limited 134175 353,280 19,422 549.8
19 Namecheap, Inc. 22612 98,176 19,214 1,957.1
20 Skycloud Computing co., Ltd. 7483 7,424 17,011 22,913.5

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 (March to May 2026)

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, Inc. 13335 1,419,776 475,064 3,346.1
2 Cloudflare London, LLC 209242 115,712 38,037 3,287.2
3 Cloudie Limited 55933 111,872 22,808 2,038.8
4 Namecheap, Inc. 22612 98,176 19,214 1,957.1
5 cognetcloud INC 401696 54,784 10,340 1,887.4
6 Antbox Networks Limited 138995 73,984 13,190 1,782.8
7 Dream Wave Shizuoka Co. Ltd. 18068 53,504 8,586 1,604.7
8 Kaopu Cloud HK Limited 138915 179,712 16,697 929.1
9 CTG Server Limited 152194 1,136,384 100,937 888.2
10 Forewin Telecom Group Limited 38186 66,304 5,586 842.5
11 RouterHosting LLC 14956 51,712 3,786 732.1
12 Hong Kong Communications International Co., Limited 140227 111,104 7,972 717.5
13 HENGDA NETWORK LIMITED 138415 301,568 20,819 690.4
14 CNSERVERS LLC 40065 1,512,960 99,379 656.9
15 ASN block not managed by the RIPE NCC 8796 166,400 9,637 579.2
16 DingFeng XinHui(HongKong) Technology Limited 134175 353,280 19,422 549.8
17 Dimension Network & Communication Limited 59371 90,880 4,542 499.8
18 cognetcloud INC 401701 58,624 2,882 491.6
19 UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED 135377 191,232 9,260 484.2
20 STARCLOUD GLOBAL PTE., LTD. 140224 74,240 3,527 475.1

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