The best free IP blacklists compared
The best free IP blacklist depends on what you are protecting. For a small network firewall list, consider Spamhaus DROP. For a scored list of attacking addresses, consider isipsafe or AbuseIPDB. If you already run a compatible agent, consider CrowdSec. isipsafe is our own service, so weigh that accordingly.
| List | What it contains | Free access | Good for |
|---|---|---|---|
| isipsafe | Addresses reported for attacks, with scores | Free account. 10 downloads a day of the whole list. | Firewalls and web servers, including company use |
| AbuseIPDB | Addresses reported by users, with scores | Free account. Up to 10,000 addresses at confidence 100. Terms exclude commercial use on free plans. | Personal projects, and larger paid lists |
| Spamhaus DROP | Network ranges used by professional abuse operations | Free, regardless of size or business type. Fetch no more than hourly. | A small "drop everything" list for routers and firewalls |
| CrowdSec Community Blocklist | Curated addresses, tailored to what your engine protects | About 15,000 addresses if you contribute, or 3,000 if not. Needs its Security Engine. | Those already running CrowdSec |
| FireHOL IP Lists | Public feeds, collected and compared | Static files. Each list belongs to its maintainer, so check its terms. | Choosing and combining public feeds |
| GreyNoise Free | Configurable blocklist from internet-wide scan data | 1 blocklist, with data refreshed every 8 hours. Some features may need a business email. | Reducing scanner noise and alert triage |
How to choose
- Check the licence. Free does not always include company use or products.
- Check how addresses leave the list. A list that only grows blocks more innocent traffic over time.
- Test before you block. Run in log-only mode first and see what would have been blocked.
- Combine carefully. Each extra list adds coverage as well as risk of false positives.
Compare them further with our pages on AbuseIPDB, CrowdSec, Spamhaus, FireHOL and GreyNoise.
Legal note. This page was written by the isipsafe team, who have an interest in the service being compared. It is based on publicly available information as we understood it on 2 November 2026, and it may be incomplete, out of date or not an accurate assessment of any service. It is general information, not professional advice or a guarantee of any result. Before you rely on it, make your own independent assessment of whether a service meets your needs, and check the provider's current terms and prices. isipsafe is not affiliated with or endorsed by the other services named here. Their names are used only to identify them. Spotted a mistake or something out of date? Tell us and we will correct it.