Why VPNs Get Blocked Almost Everywhere

VPNs get blocked almost everywhere because their exit IP addresses are easy to identify as VPN infrastructure long before any traffic is inspected. Nearly every commercial VPN routes you through servers hosted in datacenters operated by cloud providers like AWS, Google Cloud, Azure, OVH, or DigitalOcean. Those datacenter address ranges are public, well-documented, and shared by thousands of users at once. Reputation and anti-fraud databases catalog them continuously, and any website can check an incoming IP against those databases in a few milliseconds. The encryption in your tunnel is never the weak point. The address you exit from is.

This is a useful distinction to internalize, because most people assume blocking happens through some deep inspection of their encrypted packets. It almost never does. The decision to block, challenge, or allow you is usually made on metadata about the IP itself, before the request body is even read.

What does a website actually see when you connect?

When you load a page, the server on the other end receives your source IP address. From that single value it can derive a surprising amount of context by querying a handful of databases: the IP's geographic location, the network operator that owns it, the type of network it belongs to, and its accumulated reputation. None of this requires breaking your encryption. It is all derived from public registries and from years of observed behavior tied to that address.

The most consequential attribute is network type. Every IP address falls into a category: residential (a consumer broadband or mobile line), business, or hosting/datacenter. Residential and mobile addresses look like ordinary human users. Datacenter addresses look like servers. Because commercial VPNs run on servers, their exit IPs almost always classify as hosting. That single classification is the root cause of most VPN blocking.

How do IP reputation and anti-fraud databases classify addresses?

A small number of specialized vendors do the heavy lifting that powers VPN detection across the internet. MaxMind, IPQualityScore (IPQS), and Spur are among the best known. Their business is maintaining constantly updated maps of which IP addresses are residential, which are datacenter, and which are actively used by anonymizing services.

They build these maps in several ways:

• Enumeration. Researchers subscribe to commercial VPN services, connect to every server endpoint the provider offers, and record the exit IP each one presents. The result is a near-complete list of that VPN's address pool. Multiply across the major providers and you have a catalog of most VPN exit IPs in circulation.
• ASN classification. Every IP belongs to an Autonomous System, identified by an ASN, which is a block of addresses registered to a specific organization. Consumer ISPs such as Comcast or Vodafone hold ASNs classified as residential. Cloud and hosting companies such as AWS, Hetzner, and DigitalOcean hold ASNs classified as hosting. If your address resolves to a hosting ASN, that alone is a strong VPN signal.
• Behavioral observation. Vendors watch how addresses behave at scale. An IP that suddenly produces logins for hundreds of unrelated accounts, or appears in many countries' worth of activity in a day, gets flagged regardless of its registry classification.

MaxMind, for example, assigns a confidence score representing how likely a network is to be part of an actively used VPN service. Spur reports observing hundreds of millions of unique anonymized IPs across more than a thousand VPN and proxy services every few months. These databases refresh constantly, in some cases hourly, which is why an IP that worked yesterday can be flagged today.

Why are cloud provider IP ranges so easy to block?

The major cloud providers publish their entire IP allocations openly, and they expect you to use them. AWS publishes a machine-readable ip-ranges.json file. Microsoft publishes Azure's ranges as a weekly JSON download organized by region and service. Google Cloud and others do the same. These exist for legitimate operational reasons, such as configuring firewalls and routing.

But the same files are a gift to anyone who wants to block datacenter traffic. A service can download the published ranges, fold them into a blocklist, and refuse or challenge every connection originating from cloud infrastructure. Community projects even aggregate twenty-plus providers into unified, frequently-refreshed datasets in ready-to-use formats for nginx, iptables, and the like. Blocking the entire address space of the world's datacenters is genuinely trivial, and it costs the website almost nothing because real customers rarely browse from inside AWS.

Why do streaming services, banks, and ticketing sites block VPNs specifically?

Different operators block for different reasons, but the mechanism is the same lookup against the same databases.

• Streaming services block to enforce content licensing by region. Their catalogs are sold territory by territory, so they have a contractual obligation to prevent geographic circumvention. Datacenter-classified IPs are the clearest signal that a viewer is masking their real location.
• Banks and payment processors block or challenge datacenter traffic as fraud prevention. Legitimate customers almost never log into their bank from a server in a datacenter, so the presence of a hosting IP raises the risk score and triggers additional verification.
• Ticketing and retail-drop platforms block to defeat bots and scalpers, which overwhelmingly operate from cloud servers and proxy pools. Anti-bot systems treat datacenter origin as a primary risk factor.

In each case the operator is not objecting to privacy in principle. They are reacting to a network-type signal that correlates strongly with the behavior they want to stop.

What is the CAPTCHA escalation?

Blocking is rarely binary. Most modern anti-fraud systems score each request on a risk scale and respond proportionally. A clean residential IP sails through. A datacenter IP with a moderate reputation gets a CAPTCHA. A known VPN or proxy IP with a poor reputation gets a hard block or a silent failure. This is why VPN users so often find themselves solving endless image puzzles: their exit IP has pushed the request into a risk band where the system demands proof of humanity before proceeding. The CAPTCHA is not random friction. It is the visible symptom of an IP that scored badly.

Why are commercial VPN exit IPs perpetually burned?

Commercial VPNs face a structural problem they cannot fully escape. They serve large user bases from a finite, shared pool of datacenter IPs. That design guarantees their addresses get flagged for three reinforcing reasons:

• They are datacenter IPs to begin with. The base classification is working against them from day one.
• They are heavily shared. When thousands of users exit through the same address, the aggregate behavior looks nothing like a single human, and the IP accumulates abuse reports quickly.
• They are enumerable. Because anyone can subscribe and harvest the full list of exit IPs, detection vendors keep an up-to-date map of the entire pool.

Providers respond by rotating in fresh IP ranges, but this is a treadmill. New ranges are enumerated and flagged within days, and the cost and churn never end. The address is burned almost as fast as it is deployed. No amount of protocol obfuscation changes the underlying fact that the exit point is a shared server in a known datacenter.

So what makes an IP not get blocked?

Working backward from the detection mechanics, the answer is straightforward: an address that does not look like infrastructure. The properties that keep an IP off the blocklists are the inverse of everything above.

• It belongs to a residential or mobile ISP ASN, not a hosting provider. Network-type classification is the single biggest factor, and a genuine consumer-ISP address passes it cleanly.
• It is not in any published cloud range, so it never appears on the trivial datacenter blocklists.
• It is not shared across a large anonymizing pool, so it carries no aggregate-abuse history and cannot be enumerated by subscribing to a service.
• It has a clean, stable behavioral history consistent with a normal user in a consistent location.

This is also why residential proxy networks have become the hardest category for detection vendors to handle, and why they are open about it: traffic routed through genuine ISP-grade connections looks identical to ordinary human users, because at the network layer it effectively is. The distinction the entire detection industry rests on is datacenter versus residential, and an address on the residential side of that line simply does not trip the signals that block VPN traffic.

This principle is the foundation of how Blacksight VPN is built. Rather than routing vetted organizations through shared datacenter servers, it uses dedicated, genuinely local ISP lines, so connections are classified as ordinary residential traffic and are not subject to the datacenter-based blocking described here. The detection mechanics do not change, but the address you present to the world sits on the right side of the only line that matters.

The practical takeaway for anyone evaluating VPN technology is to stop asking how strong the encryption is and start asking where the exit IP lives. That question, not the cipher suite, determines whether you get through or get blocked.