Spam Activity in Hosting Networks (ASNs)
Quarter over Quarter Comparison:
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 compare the ranking of Hosting Networks (ASNs) for the September 1, 2025 - November 30, 2025 period to the ranking for the December 1,2025 - February 28,2026 period.

Ranking of Hosting Networks (ASNs) by Hosted Spammed Content or Spambots, Quarter over Quarter (December to February 2026)

IPv4 Addresses Assigned # of Spammed Content
or Spambot Hosts
Rank Hosting Provider ASN September to November 2025 December to February 2026 September to November 2025 December to February 2026 ▼
1 Cloudflare, Inc. 13335 1,405,696 1,422,592 (+1%) 658,549 478,923 (-27%)
2 ▲ +2* Alibaba (US) Technology Co., Ltd. 45102 7,673,600 7,969,024 (+4%) 142,756 128,198 (-10%)
3 CTG Server Limited 152194 1,041,664 1,032,960 (-1%) 152,329 108,858 (-29%)
4 ▼ -2 Amazon.com, Inc. 16509 201,312,256 218,616,064 (+9%) 235,137 96,778 (-59%)
5 CNSERVERS LLC 40065 1,389,568 1,388,800 (0%) 132,143 85,302 (-35%)
6 ▲ +8 OVH SAS 16276 4,715,776 4,765,440 (+1%) 49,309 52,088 (+6%)
7 ▼ -1 POWER LINE (HK) CO., LIMITED 132839 1,139,200 847,104 (-26%) 106,404 47,913 (-55%)
8 ▲ +1 Cloudflare London, LLC 209242 125,952 120,320 (-4%) 73,697 45,696 (-38%)
9 ▼ -1 Microsoft Corporation 8075 66,551,552 66,529,536 (0%) 84,689 44,237 (-48%)
10 ▼ -3 DingFeng XinHui(HongKong) Technology Limited 134548 1,467,904 1,437,696 (-2%) 91,692 40,027 (-56%)
11 ▲ +4 Google LLC 396982 54,314,240 54,441,216 (0%) 47,130 38,416 (-18%)
12 ▲ +16 Antbox Networks Limited 138995 75,264 73,984 (-2%) 21,074 37,584 (+78%)
13 N/R** BGPNET PTE. LTD. 4907 9,984 9,984 (0%) 7,256 35,039 (+383%)
14 ▲ +3 Clayer Limited 137951 413,952 392,448 (-5%) 44,826 31,137 (-31%)
15 ▲ +8 Shenzhen Tencent Computer Systems Company Limited 132203 2,706,688 2,710,272 (0%) 28,976 27,537 (-5%)
16 ▼ -6 HENGDA NETWORK LIMITED 138415 356,608 305,920 (-14%) 67,550 24,172 (-64%)
17 ▲ +16 STARCLOUD GLOBAL PTE., LTD. 140224 227,840 237,056 (+4%) 18,380 20,174 (+10%)
18 ▲ +14 SonderCloud Limited 133199 218,112 309,760 (+42%) 19,118 20,079 (+5%)
19 ▲ +7 Google LLC 15169 2,550,272 2,553,344 (0%) 23,316 19,398 (-17%)
20 ▲ +16 Amazon.com, Inc. 14618 19,331,584 19,873,024 (+3%) 13,738 18,047 (+31%)

* Indicates change over prior quarter

** Indicates not ranked in prior quarter; either number of addresses or number of spam attacks did not meet minimum threshold for ranking

Ranking of Hosting Networks (ASNs) by Hosted Content/Spambot Score, Quarter over Quarter (December to February 2026)

Hosting Providers with a minimum of 50,000 addresses assigned to the ASN and 25 spam attacks

IPv4 Addresses Assigned Spam Score
Rank Hosting Provider ASN September to November 2025 December to February 2026 September to November 2025 December to February 2026 ▼
1 ▲ +7* Antbox Networks Limited 138995 75,264 73,984 (-2%) 2,800.0 5,080.0 (+81%)
2 ▼ -1 Cloudflare London, LLC 209242 125,952 120,320 (-4%) 5,851.2 3,797.9 (-35%)
3 ▲ +1 Cloudflare, Inc. 13335 1,405,696 1,422,592 (+1%) 4,684.9 3,366.6 (-28%)
4 ▼ -2 cognetcloud INC 401696 63,232 105,216 (+66%) 5,715.3 1,318.6 (-77%)
5 ▲ +6 Tcloudnet 399077 131,712 130,560 (-1%) 1,805.7 1,178.4 (-35%)
6 ▲ +8 CTG Server Limited 152194 1,041,664 1,032,960 (-1%) 1,462.4 1,053.9 (-28%)
7 ▲ +22 Namecheap, Inc. 22612 136,768 112,256 (-18%) 710.6 1,051.7 (+48%)
8 ▼ -3 Netsec Limited 45753 111,104 110,336 (-1%) 4,158.0 915.9 (-78%)
9 ▼ -3 PEG TECH INC 398478 174,080 166,144 (-5%) 3,458.0 891.4 (-74%)
10 ▲ +32 Dream Wave Shizuoka Co. Ltd. 18068 51,456 52,480 (+2%) 353.7 868.5 (+146%)
11 ▲ +15 STARCLOUD GLOBAL PTE., LTD. 140224 227,840 237,056 (+4%) 806.7 851.0 (+5%)
12 ▼ -5 Forewin Telecom Group Limited 38186 68,352 66,816 (-2%) 2,960.1 842.0 (-72%)
13 ▼ -10 Dimension Network & Communication Limited 59371 134,656 134,400 (0%) 4,706.6 825.3 (-82%)
14 ▲ +4 Clayer Limited 137951 413,952 392,448 (-5%) 1,082.9 793.4 (-27%)
15 ▼ -6 HENGDA NETWORK LIMITED 138415 356,608 305,920 (-14%) 1,894.2 790.1 (-58%)
16 ▲ +11 Cloudie Limited 55933 328,448 179,456 (-45%) 799.6 763.5 (-5%)
17 ▲ +5 SonderCloud Limited 133199 218,112 309,760 (+42%) 876.5 648.2 (-26%)
18 ▲ +17 Kaopu Cloud HK Limited 138915 178,944 184,064 (+3%) 519.5 643.7 (+24%)
19 ▼ -6 ASN block not managed by the RIPE NCC 8796 203,776 176,384 (-13%) 1,638.0 643.1 (-61%)
20 CNSERVERS LLC 40065 1,389,568 1,388,800 (0%) 951.0 614.2 (-35%)

* Indicates change over prior quarter


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