Spam Activity in Hosting Networks (ASNs)
December 1,2025 - February 28,2026

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 (December to February 2026)

Rank AS Name AS number # Routed
IPv4 Addresses		 # of Spammed Content
or Spambot Hosts ▼		 Spam Score
1 Cloudflare, Inc. 13335 1,422,592 478,923 3,366.6
2 Alibaba (US) Technology Co., Ltd. 45102 7,969,024 128,198 160.9
3 CTG Server Limited 152194 1,032,960 108,858 1,053.9
4 Amazon.com, Inc. 16509 218,616,064 96,778 4.4
5 CNSERVERS LLC 40065 1,388,800 85,302 614.2
6 OVH SAS 16276 4,765,440 52,088 109.3
7 POWER LINE (HK) CO., LIMITED 132839 847,104 47,913 565.6
8 Cloudflare London, LLC 209242 120,320 45,696 3,797.9
9 Microsoft Corporation 8075 66,529,536 44,237 6.7
10 DingFeng XinHui(HongKong) Technology Limited 134548 1,437,696 40,027 278.4
11 Google LLC 396982 54,441,216 38,416 7.1
12 Antbox Networks Limited 138995 73,984 37,584 5,080.0
13 BGPNET PTE. LTD. 4907 9,984 35,039 35,095.2
14 Clayer Limited 137951 392,448 31,137 793.4
15 Shenzhen Tencent Computer Systems Company Limited 132203 2,710,272 27,537 101.6
16 HENGDA NETWORK LIMITED 138415 305,920 24,172 790.1
17 STARCLOUD GLOBAL PTE., LTD. 140224 237,056 20,174 851.0
18 SonderCloud Limited 133199 309,760 20,079 648.2
19 Google LLC 15169 2,553,344 19,398 76.0
20 Amazon.com, Inc. 14618 19,873,024 18,047 9.1

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 (December to February 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 Antbox Networks Limited 138995 73,984 37,584 5,080.0
2 Cloudflare London, LLC 209242 120,320 45,696 3,797.9
3 Cloudflare, Inc. 13335 1,422,592 478,923 3,366.6
4 cognetcloud INC 401696 105,216 13,874 1,318.6
5 Tcloudnet 399077 130,560 15,385 1,178.4
6 CTG Server Limited 152194 1,032,960 108,858 1,053.9
7 Namecheap, Inc. 22612 112,256 11,806 1,051.7
8 Netsec Limited 45753 110,336 10,106 915.9
9 PEG TECH INC 398478 166,144 14,810 891.4
10 Dream Wave Shizuoka Co. Ltd. 18068 52,480 4,558 868.5
11 STARCLOUD GLOBAL PTE., LTD. 140224 237,056 20,174 851.0
12 Forewin Telecom Group Limited 38186 66,816 5,626 842.0
13 Dimension Network & Communication Limited 59371 134,400 11,092 825.3
14 Clayer Limited 137951 392,448 31,137 793.4
15 HENGDA NETWORK LIMITED 138415 305,920 24,172 790.1
16 Cloudie Limited 55933 179,456 13,701 763.5
17 SonderCloud Limited 133199 309,760 20,079 648.2
18 Kaopu Cloud HK Limited 138915 184,064 11,848 643.7
19 ASN block not managed by the RIPE NCC 8796 176,384 11,343 643.1
20 CNSERVERS LLC 40065 1,388,800 85,302 614.2

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