Every check we run, free.
No account, no key, no quota, no expiry. The same intelligence that answers our commercial API answers these, against the same database, updated continuously.
IP blacklist check
Check any IPv4 or IPv6 address against our abuse database. See if it is listed, why, and how recently.
OpenIP reputation
A 0 to 100 fraud score for any IP address, with every signal that produced it shown in the open.
OpenEmail blacklist check
Paste any email address. Disposable, phishing, role account, known spammer, and community reports, in one verdict.
OpenDomain reputation
Look up any domain for phishing, scam, and disposable-mailbox history, with the evidence shown.
OpenProxy and VPN detection
Test whether an address is seen as a VPN, proxy, Tor node, or datacenter host, and what to do about it.
OpenWhat is my IP
Your public address, plus the risk score, VPN classification, and network reputation that sites see with it.
OpenFree IP lookup
Owner, network, autonomous system, reverse DNS, and approximate location for any address.
OpenFree IP abuse check
See whether an address has been reported for attacks, for what, and how much those reports weigh.
OpenFree email checker
Format, disposable providers, role accounts, phishing domains, and known spam addresses in one verdict.
OpenFree temp email API
Detect disposable addresses from your own code with one unauthenticated call, or download the whole list.
OpenWebsite safety check
Paste a link to check it against millions of known phishing and scam domains, plus the checks to run yourself.
OpenReverse DNS lookup
Find the PTR record for any address, the network behind it, and what the hostname gives away.
OpenASN lookup
Find the organisation behind any network by AS number or IP, and how abusive its observed traffic is.
OpenDisposable email checker
Check whether an email domain hands out throwaway mailboxes, and whether to block it at signup.
OpenThe same database answers all of them.
These are not separate products stitched together. Every tool on this page queries one engine holding 23 million profiled IP addresses, 2.7 million malicious domains, and 223,000 disposable email domains, assembled from our own honeypot sensors, community reports, and independent threat feeds that have to agree before anything is listed. You can download all of it.
Questions people ask.
Yes, and permanently. There is no account required to use any of them on the web, the API endpoints behind them are free and need no key, and the underlying datasets are published on GitHub under the MIT license. There is no trial, no credit limit, and no upgrade prompt attached to any of it.
There is no catch on the free tier. We publish the data because a fraud database gets better the more people check against it and report to it, and because most of the industry sells access to lists that were assembled from public sources in the first place. Paid plans exist for the higher-volume commercial API, and the free surface is not a reduced version of it.
Lookups are aggregate-counted so we can tell which parts of the service get used and keep them running. We do not build a profile of what you looked up, and checking an address does not report it. Reporting is a separate, deliberate action on the report page.
Yes. The public API endpoints are free and unauthenticated, a free account raises the ceiling and adds batch calls, and the full datasets can be downloaded and embedded in your own systems under the MIT license. Attribution is appreciated and never required.