How the NSFW website checker works
The checker compares ordinary DNS responses with Cloudflare's malware filter and its combined adult-content and malware filter. It checks both IPv4 and IPv6 records for the exact hostname you enter, including any subdomain. It does not scan the content of a specific URL.
What do the results mean?
- Possible adult content: the domain resolves normally through the standard and security resolvers, but the combined adult-content filter blocks it. This suggests an adult-content classification.
- Security filter warning: both filtering resolvers block the domain while standard DNS resolves it. This indicates a security filter block, but does not establish whether adult content is present.
- Not flagged by these filters: all three resolvers return usable addresses. This is not a guarantee that the content is suitable for work or that the site is trustworthy.
- Unable to determine: DNS fails, a service times out, records are missing, or the responses conflict. An inconclusive check does not indicate that a site is safe.
Can it check an individual post or a shortened link?
No. A forum, social network, or hosting service can contain both ordinary and explicit content on the same hostname. A shortened link checks the shortener's hostname, not its destination. The checker does not assess profanity, graphic violence, downloads, or content behind a login.
Privacy and freshness
The hostname is sent to DevPicker and, for a fresh lookup, Cloudflare's DNS services. Paths, query strings, and fragments are removed in your browser before the request. Completed results may be reused for up to 24 hours; the result shows when the DNS check was made. There is no public lookup history. Filters and websites can change, and incorrect classifications are possible.
Read about Cloudflare's filtering options and miscategorization feedback. For a URL's destination, use the redirect checker; that tool follows redirects but does not assess the destination's content.
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