Whoer

Whoer is an IP lookup and privacy assessment service that specializes in scoring your overall anonymity level and detecting whether connections are routed through proxies, VPNs, or Tor. Unlike simple IP checkers that only show your apparent location, Whoer combines multiple privacy vectors into a single assessment score that reflects how anonymous your connection appears to tracking systems and fraud detection services. The platform functions as both a public-facing checker and an API service for developers and proxy providers who need to verify connection behavior across their infrastructure.

The core interface displays your IP address with geolocation data broken down by country, city, region, postal code, and approximate coordinates. Whoer shows which ISP operates the IP, the ASN (Autonomous System Number), and the hostname if one is registered. The platform then performs deeper analysis on that IP to determine whether it appears to be a residential connection assigned to household users, a commercial or business IP, a mobile carrier connection, or a datacenter IP that commonly hosts proxy infrastructure. This classification matters because residential proxies are harder to detect and block than datacenter proxies, and Whoer's ability to categorize an IP accurately tells you whether your proxy provider is delivering what they claim.

Beyond IP classification, Whoer runs DNS leak tests that check whether your DNS queries are resolving through the proxy's DNS servers or whether they are leaking through your real ISP's nameservers. This is critical for proxy users because DNS leaks completely bypass your proxy's anonymity, allowing tracking systems to see which websites you visit even if your IP address is masked. Whoer sends DNS queries to various public resolvers and shows you which ones respond, revealing whether your system is configured to use the proxy's DNS or if it is falling back to your ISP's default resolvers. The test results are clear and actionable: if you see your ISP's nameservers responding instead of the DNS servers your proxy should be using, you have a configuration problem that needs fixing.

The platform includes browser fingerprinting detection that tests for canvas fingerprinting, WebGL fingerprinting, font detection, and JavaScript-exposed system properties like timezone, language, and screen resolution. Canvas fingerprinting works by having your browser draw a hidden image and then extracting a unique fingerprint from how your graphics card renders it. Whoer performs this test and shows you whether your browser is vulnerable to this tracking method. If your canvas fingerprint remains consistent across different IPs, websites can track you even if your proxy changes your IP address. Similarly, WebGL fingerprinting extracts information about your GPU's capabilities, and Whoer shows whether this is leaking identifying information that persists across proxy changes.

Whoer's anonymity score is its most distinctive feature. Rather than showing you disconnected test results, the platform combines IP classification, DNS leak status, browser fingerprint consistency, and blacklist status into a single score that represents how anonymous your connection appears. The score ranges from fully identified to fully anonymous, with intermediate levels showing partial anonymity. A score of less than forty percent means your identity is likely detectable by tracking systems, while a score above eighty percent means you are well masked. The score helps you quickly understand whether your proxy setup is adequate or whether you have configuration issues that need fixing. If you change proxy providers and your anonymity score drops significantly, something is wrong with the new provider's configuration.

The API and bulk lookup features make Whoer valuable for proxy managers and infrastructure teams. Instead of checking one IP at a time through the web interface, you can use Whoer's API to check dozens or hundreds of IPs programmatically and get structured results that you can parse and act on. This is useful when you maintain a large proxy pool and need to verify that new IPs are properly configured, or when you want to audit your entire proxy infrastructure for configuration drift. The API returns results in JSON format with all the same data that the web interface provides, so you can integrate Whoer's checks into your monitoring and alerting systems.

Whoer also maintains a blacklist check that shows whether your IP appears on known spam, phishing, or fraud detection lists. This is important because many proxy IPs become listed after they are used for spamming or other abuse, and you need to know this before you commit to using an IP for your own purposes. If you are buying a proxy IP that is already listed on major blacklists, services will block it, and you need to know that before paying for it. Whoer's blacklist check covers the major lists that matter for web requests, advertising networks, and email services.

The platform's strength lies in its combination of multiple privacy signals into one place rather than forcing you to run tests on several different tools. You can run a full audit of a proxy's anonymity without leaving Whoer, and the results are presented clearly enough that you can explain them to a non-technical stakeholder if needed. If your boss asks whether a new proxy provider is delivering the anonymity you are paying for, you can run a Whoer check, show them the anonymity score, and they understand immediately whether the proxy is working.

The limitations of Whoer are that it tests only browser-based traffic and cannot audit non-browser applications. If you are building a Python script or Go program that uses proxies, Whoer cannot test whether that code is correctly routing traffic through the proxy or leaking your real IP through other channels. The platform also depends on the accuracy of its IP classification databases, which are updated regularly but can lag behind new proxy infrastructure. If a proxy provider starts using a new IP block that Whoer's database has not yet classified, Whoer might initially misclassify it as residential when it is actually datacenter infrastructure, though this usually corrects within days as the database updates.

Whoer is best suited for proxy users who want a comprehensive, single-tool audit of their setup, and for proxy managers who need an API-based verification system they can integrate into their infrastructure. If you are evaluating different proxy providers and want a fair comparison, Whoer's standardized testing and scoring makes it easier to see which provider's proxies are actually more anonymous. The blacklist integration is particularly valuable if you are buying residential proxies and need to verify that you are not getting previously abused IPs. For individual proxy users who just want to verify their setup is working correctly before logging into sensitive services, Whoer provides the right balance of technical depth and ease of use.