After years of running websites, I've seen too many sites go down because their IP got blocked, nodes became unstable, or network routes got restricted.

This is especially common for businesses like international e-commerce, cross-border services, Web3, and API services. You often see:

• Works fine today
• Can't open tomorrow
• IP gets exposed by probes
• Nodes get blocked
• Accessible in one region, inaccessible in another
• Traffic suddenly routes from Hong Kong to Europe/US, causing absurd latency

So many people ask me:

"Is there a truly effective anti-blocking CDN? Is it reliable? Can it actually solve the problem of nodes getting blocked?"

I asked myself the same questions.

But the difference is—I actually spent the time testing, platform by platform.

Including:

• Cloudflare
• Gcore
• BunnyCDN
• Fastly
• CDN07 (Asia-focused)
• And a few niche CDNs not worth naming

Using real domains, real DNS, and real business scenarios, I tested each CDN's

node routing, blocking resistance strategies, IP pool quality, and automatic failover logic

thoroughly.

This article isn't theory, marketing, or copied from official websites.

It's an in-depth report from a webmaster who actually did the work.

What you want to know—I've written it all down clearly.

1. The Verdict First: Anti-Blocking CDNs "Work," But Aren't a Magic Bullet

After several rounds of testing, I can sum it up with one very real statement:

Anti-blocking CDNs are effective, but only against "general blocking, node blocking, link restrictions."
No CDN guarantees 100% survival against "strong, deliberate, targeted blocking."

In other words:

✔ What Anti-Blocking CDNs Can Effectively Solve:

• A node being blocked in a specific region
• A specific IP being blocked
• A specific network link becoming unstable
• Inaccessibility via a specific ISP
• Unstable access during certain periods
• Automatic switching of IPs / nodes / routes

✘ What They Cannot Solve:

• Nationwide blocking (e.g., Great Firewall-level)
• Global, high-intensity blocking
• Targeted blacklist-level blocking

However, what most international e-commerce sites, cross-border services, and API sites face isn't "nationwide blocking."

It's the more common level of:

"Nodes getting blocked + IP pools getting blacklisted + Routes getting throttled"

In these cases, anti-blocking CDNs are extremely effective.

Below, I'll show you through real tests how well they actually work.

2. What Makes a CDN "Anti-Blocking"? (Many People Get This Wrong)

Many vendors advertise "blocking resistance," but after actually testing with domains, I found:

In short: Not every CDN has genuine anti-blocking capabilities.

To truly judge a CDN's blocking resistance, you need to look at 5 key technical points.

Technical Point 1: IP Pool Size (Determines if You Can Change IPs)

The core capability of anti-blocking isn't actually the number of nodes,
but rather:

How many usable egress IPs does this CDN have?
Can it switch quickly after an IP is blocked?

My test results:

Simply put:

Larger IP pool = Lower risk of being blocked.

Technical Point 2: Node Shifting

This is a core technical capability for anti-blocking.

Let me explain what "Node Shifting" is:

When a node in a region gets blocked or latency spikes,

the system automatically makes all users "shift to other nearby nodes."

I tested with Shanghai Telecom, Zhejiang Mobile, and Guangzhou Unicom:

• Cloudflare: Most intelligent node shifting, but free tier routing can be unstable
• Bunny: Shifting sometimes lags by half a second
• Gcore: Very stable shifting for Europe traffic
• Fastly: Doesn't shift often, but is stable
• CDN07: Fastest shifting in Asia (Hong Kong ↔ Singapore ↔ Japan)

Especially with CDN07, I deliberately made a Hong Kong node fail. The result:

Under 2 seconds, all requests automatically shifted to Singapore. No service interruption.

Faster node shifting = stronger blocking resistance.

Technical Point 3: Anycast Architecture (The Core of Global Blocking Resistance)

Anycast is a foundational capability for anti-blocking CDNs.
It allows:

• Global nodes to share access load
• Access to automatically use the nearest node
• Automatic shifting away from blocked nodes
• Attacks to be dispersed to different data centers globally

My test results:

So if you ask:

"Is there a CDN with strong anti-blocking capabilities?"

The first criterion isn't node count, but:

✔ Does it have a complete global Anycast architecture?

Technical Point 4: Origin Hiding (Anti-Detection Capability)

If your origin server IP is exposed, no amount of anti-blocking will help.

I mainly tested:

• Whether the origin IP can be completely hidden
• Whether it blocks Ping / Traceroute
• Whether it prevents malicious origin scanning
• Whether it resists "side-channel detection"

Results:

The more thorough the origin hiding, the harder it is for the CDN to be blocked.

Technical Point 5: Multi-Origin Strategy (Fallback Origin)

This is something many webmasters overlook.

When the primary origin route is blocked, can the CDN automatically switch to a backup origin?

My tests:

• Cloudflare: Supports it, but configuration is somewhat complex
• Bunny: Supports it, but manual
• Gcore: Supports it and is stable
• Fastly: Supports it, but developer-oriented
• CDN07: Has multi-origin + health checks → Best blocking resistance

This capability determines:

Whether your site can "seamlessly switch" when the "primary route is blocked."

3. Real Test: What Happens When Different CDNs Face "Node/IP Blocking"?

I simulated two real-world scenarios:

Test Scenario A: Hong Kong Node Blocked

I blackholed the route to a Hong Kong node, forcing domestic traffic to shift.

Results:

Cloudflare: Immediately switched to Korea / Japan / Taiwan nodes. Access continued, but latency increased.

Bunny: Shifting was slightly slower, with about a 0.5–1 second "hiccup."

Gcore: Very stable for Europe traffic, but Asian shifting wasn't fast enough.

Fastly: Switching slow, but stable.

CDN07: Fastest: Switched to Singapore within 2 seconds. No disconnection, no lag.

Test Scenario B: Egress IP Blocked

I tested with API and frontend access across multiple ISPs:

• Cloudflare: Automatically switched IPs. Strong blocking resistance.
• Gcore: Also automatically switched, but slightly slower.
• Bunny: Requires manual intervention.
• Fastly: Weak automatic switching capability.
• CDN07: Fastest switching in Asia. Almost imperceptible.

4. Final Real-World Blocking Resistance Ranking (Based on Tests)

Comprehensive ranking based on five dimensions: "Node Shifting + IP Pool + Anycast + Origin Hiding + Multi-Origin":

If your business primarily targets Asia (especially China → Asia → overseas routes),

Based on my tests:

► CDN07's anti-blocking performance is more stable than Cloudflare's free tier
► Node shifting between Hong Kong + Singapore + Japan is very fast
► Fastest automatic recovery from IP blocking

5. Which Businesses "Must Use" Anti-Blocking CDNs?

The following types of businesses are not suitable for ordinary CDNs:

✔ International E-commerce Stores

✔ Marketing Landing Pages

✔ APIs / Authentication / Login Services

✔ Web3 Frontends

✔ Multi-ISP + Multi-Region Access

✔ Sites Frequently Scanned/Probed

✔ Services That Require Guaranteed Uptime (Cannot Go Down)

If you fall into any of the above categories,

Not using an anti-blocking CDN = Waiting to get blocked.

6. Which Businesses "Completely Don't Need" Anti-Blocking CDNs?

• Small blogs
• Static sites
• Image hosting sites
• Non-sensitive small tools
• No cross-border traffic
• No attack risk

Cloudflare's free tier is enough for these.

7. Anti-Blocking CDNs Aren't "Magic," But They Are "Essential"

My real conclusion is just one sentence:

Anti-blocking CDNs can't guarantee "never being blocked,"
but they can guarantee "staying accessible even when blocked."

That's their value.

Ordinary CDN: Blocked = Site down.

Anti-Blocking CDN: Blocked = Automatically changes nodes / changes IPs / switches origins / disperses via Anycast.

If your business is critical (especially APIs, international trade, frontend sites, Web3),

An anti-blocking CDN isn't a nice-to-have; it's a necessity.

FAQ:

Q1: Can anti-blocking CDNs really prevent a site from being blocked?

A:
They can't guarantee 100%, but they can keep a site "accessible even when blocked." The core relies on IP pools, node shifting, Anycast, and multi-origin strategies. An ordinary CDN goes down when blocked; an anti-blocking CDN automatically switches nodes or IPs to stay online.

Q2: What's the difference between an anti-blocking CDN and an ordinary CDN?

A:
The biggest difference is blocking resistance. When an ordinary CDN's node or IP is blocked, you can only wait for the platform to fix it. An anti-blocking CDN actively shifts nodes, switches IPs, and even automatically switches to backup origins—access doesn't中断.

Q3: Which businesses need to use anti-blocking CDNs?

A:
International e-commerce stores, API-based services, Web3 projects, APIs with multi-region access, marketing pages, cross-border applications, etc. If your site is frequently scanned, probed, or restricted, an anti-blocking CDN is necessary.

Q4: Can Cloudflare be used as an anti-blocking CDN?

A:
The paid tier can, and it's strong. The free tier is unstable, prone to false positives, and more likely to trigger risk controls. For Asia traffic, Cloudflare is also less stable than Asia-focused CDNs like CDN07.

Q5: What are the most critical metrics when choosing an anti-blocking CDN?

A:
Five key points: IP pool size, node shifting speed, Anycast architecture, origin hiding capability, and multi-origin strategy. These directly determine the CDN's blocking resistance.

Q6: If a site's origin server IP is exposed, can a CDN still provide anti-blocking?

A:
It's very difficult. True anti-blocking requires completely hiding the origin. Otherwise, if attackers target the origin directly, you're dead. When choosing a CDN, you must confirm it has strong origin hiding and anti-detection capabilities.

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