Do not block signups just because a request comes from a cloud-hosted IP address, ASN, or country. Treat network reputation as one clue, then protect the signup endpoint with tuned rate limits, server-validated challenges, and account-risk signals where available. Measure the effect on legitimate users and adjust the rules.
Why cloud-hosted traffic is not proof of abuse
Cloud infrastructure can be used by automated attackers, but it also serves legitimate users. Shared networks, VPNs, proxies, and hosted services can make unrelated people appear to come from the same network. Meanwhile, attackers can distribute requests across changing IP addresses. Cloudflare warns that advanced bots can evade ASN blocks and rate limits, and that broad IP blocking can create false positives: Cloudflare bot concepts.
A cloud ASN or address range is therefore a useful risk signal, not a reliable identity check. Blocking an entire provider may stop some abusive traffic while also denying real customers. Build controls around what a request does and how it behaves, not only where it appears to originate.
Start by observing signup traffic
Before changing defenses, identify the signup endpoint and review its request patterns, outcomes, and suspicious clusters. Look at successful and failed submissions, request volume, and any other characteristics that distinguish abusive activity from ordinary use. Cloudflare recommends reviewing bot analytics before changing bot settings: Bot analytics.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →#1 Best Overall
- Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 2 x vCPU core
- Fortinet HW FWB-VM02
- Manufacturer Part: FWB-VM02
Where your platform permits it, begin with monitoring or a less disruptive action while you establish a baseline. A rule that looks effective because it reduces signup volume may also be preventing genuine registrations.
Protect the endpoint with complementary controls
Challenge suspicious form submissions
A challenge such as Turnstile can be added to a signup form to challenge suspected bots. The server must validate the challenge result before processing the signup; displaying a widget in the browser alone does not secure the endpoint. See Cloudflare’s guidance on using Turnstile.
Rank #2
- Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 4 x vCPU core
- Fortinet HW FWB-VM04
- Manufacturer Part: FWB-VM04
Rate-limit the signup endpoint
Apply rate limits to the actual signup route, not just the page that displays the form. Direct POST requests can bypass client-side form behavior, so rate limiting covers a different path than a browser challenge. Cloudflare describes rate limiting for abuse prevention and documents plan-dependent fields and counters in its WAF rate limiting documentation.
Choose counting characteristics based on the abuse you observe and the features available on your plan. Do not assume that one source IP equals one person: shared NAT, VPNs, and hosting can group legitimate users, while distributed bots can rotate addresses. The cited guidance does not establish a universal safe threshold. Tune limits against your own traffic rather than copying a number from another service.
Rank #3
- Fortinet Web Application Firewall - virtual appliance for all supported platforms. Supports up to 8 x vCPU core
- Fortinet HW FWB-VM08
- Manufacturer Part: FWB-VM08
Escalate using combined risk signals
Network, request-rate, bot, and account signals cover different patterns. If your platform supports them, combine those signals instead of denying a signup based on cloud hosting alone.
Account-abuse signals
Cloudflare’s Account Abuse Protection documentation describes signals for bulk account creation and suspicious email patterns. It is documented as Early Access for Bot Management Enterprise customers. If automatic endpoint detection misses a nontraditional signup route, the endpoint may need to be labeled: Account Abuse Protection.
Rank #4
- Meraki MX100: A building block for SASE in a rack-mountable form factor. Medium- to large-branch security and SD-WAN appliance for up to 500 users.
- WAN: 1 x GbE RJ45, 1 x USB (cellular failover), Dual-purpose: 1 x GbE RJ45 +++ LAN: 8 x GbE RJ45, 2 x GbE SFP
- Stateful firewall throughput: 750 Mbps +++ 500 Mbps site-to-site VPN throughput
- Unified management for security, SD-WAN, Wi-Fi, switching, MDM, and IoT +++ Centralized management via web-based dashboard or API
- True zero-touch provisioning +++ Smartphone-like firmware updates
Patterns across changing IP addresses
Cloudflare’s Ephemeral IDs guidance describes identifying repeated patterns even when IP addresses change. The feature has Enterprise prerequisites, and Cloudflare cautions that thresholds should be set high enough to avoid false positives: Ephemeral IDs.
Measure false positives and tune the rules
Track how many signups are challenged, blocked, passed, or abandoned, and review reports from users who cannot register. Cloudflare defines false positives as real people or applications scored as automated or likely automated; eligible Bot Management customers can submit incorrect scores through its feedback process: false positives and feedback.
Best Value
- ◆Powerful Celeron N2840 Processor: N2840 Processor, 2 Cores 2 Threads, 1M Cache, Max Turbo Frequency 2.58 GHz, TDP 7.5 W. Whether you need a robust home server, a versatile tool for school education, seamless web browsing, or even efficient business office or industrial tasks, providing efficient performance for everyday tasks.
- ◆Dual 1000M LAN: Mini Router PC with 2*Realtek RTL8111H network card chip full UDE 1000M with filter connector.Soft Router can monitor network data, improve network security, powerful and widely used.
- ◆DDR3L Memory & Large Storage Capacity: Firewall box computer with 1 x DDR3L SO-DIMM memory 1333/1600MHz, 1xMSATA3.0 SSD.
- ◆UHD Graphics & 4K Dual Screen Display: N2840 processor integrated UHD Graphics, HD and VGA dual display interfaces support 4K@60Hz.
- ◆Versatile Connections ports: 2 x1000M Realtek RTL8111H-LAN,2 xUSB3.0, 4 xUSB2.0, HDMI,VGA,AUDIO supports data storage and system boot.Mini desktop computer with WIFI dual antenna, which providing high-speed transmission and reliable connectivity. Support Dual Band Wifi, Internet, streaming media and audio can be used perfectly without interrupting the connection. Enjoy faster file transfers and smoother online experiences.
- Use logging or a challenge before a hard block while validating a rule, where your platform supports those actions.
- Compare the effect on suspicious traffic with the effect on completed legitimate signups.
- Adjust the threshold, counting key, or action when legitimate users are being caught.
- Recheck product availability and plan requirements as they can change.
Cloudflare reported that its Turnstile signup rollout blocked more than 1 million automated signup attempts in one month, with no reported false positives. That is a company-reported result for its own deployment, not an independent benchmark or a general success rate: Cloudflare’s Turnstile announcement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose controls by coverage and user impact
| Control | What it covers | Important limitation |
|---|---|---|
| Cloud-network signal | Requests associated with known network or hosting characteristics. | Weak on its own: legitimate users share infrastructure, and attackers can rotate addresses. |
| Form challenge | Suspicious submissions interacting with the signup flow. | Requires server-side validation; a browser widget alone does not protect the endpoint. |
| Endpoint rate limit | Excessive request volume to the signup route, including direct requests. | Thresholds and counting options need to fit observed traffic and plan capabilities. |
| Account-risk signals | Patterns such as bulk account creation or suspicious email signals. | Availability depends on product and plan; Account Abuse Protection is documented as Early Access for Bot Management Enterprise. |
| Cross-IP pattern detection | Repeated behavior that persists while source IPs change. | Ephemeral IDs has Enterprise prerequisites and requires careful threshold tuning. |
When evaluating a control, consider what it covers, how easily it can be bypassed, the cost of challenging or blocking a real user, and the operational work required to integrate and tune it. A layered setup is more resilient than a blanket cloud-provider deny rule; Cloudflare’s guidance puts it plainly: “Both together provide the strongest coverage.” — Cloudflare, “Stop malicious bots while allowing legitimate traffic”.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
