Security blacklists decide whether millions of people can reach your website. When your domain lands on one, others often follow, because vendors share data.
This guide explains the four types of security blacklists, how to prioritise them and how to get removed from each.
Key takeaways
- Security blacklists fall into four groups: browser blocklists, antivirus vendors, web filters and threat intelligence feeds.
- Start with the lists that block the most visitors, usually Google Safe Browsing and major antivirus vendors.
- Each vendor needs its own request, backed by the same core evidence.
- Lists copy each other, so monitor after removal to catch reappearing listings.
The four types of security blacklists
Understanding the type of list helps you predict its impact:
- Browser blocklists such as Google Safe Browsing and Yandex Safe Browsing show full-page warnings in the browser.
- Antivirus vendors such as Bitdefender, Kaspersky, ESET and Sophos block your site on protected devices.
- Web filters such as Fortinet FortiGuard, Cisco Talos and Forcepoint block access on business networks.
- Threat intelligence feeds such as CRDF, alphaMountain.ai and URLhaus feed data into many other products.
How to prioritise
Not every listing has the same impact. Tackle them in this order:
- Google Safe Browsing, because it blocks nearly all browser traffic.
- Major antivirus vendors used by your customers.
- Web filters, if you sell to businesses or schools.
- Threat feeds visible on VirusTotal, because they spread to other products.
If you are short on time, fix the browser warning first and then work through the rest in batches. A managed case handles them all in parallel.
The evidence every vendor wants
Although each vendor has its own form, they all look for the same information: the exact flagged URL or domain, a description of your business, proof that the site is clean and an explanation of any cleanup. Prepare this once and reuse it. Our delisting evidence checklist has a template.
Vendor-specific removal processes
We maintain step-by-step instructions for the vendors that cause the most trouble: VirusTotal vendors, Google Safe Browsing, Bitdefender, Kaspersky, ESET and Fortinet. For a wider overview, see the blacklist removal guide.
Realistic timelines
Google Safe Browsing usually responds in one to three days. Major antivirus vendors take one to five working days. Web filters can take up to a week, and smaller threat feeds vary from hours to several weeks. Plan for the whole process to take one to two weeks when several lists are involved.
Staying off security blacklists
Prevention comes down to three habits: keep your software updated, avoid risky third-party scripts and monitor your domain continuously. Read blacklist monitoring versus false positive handling to see how monitoring and removal work together.
Frequently asked questions
What is a security blacklist?
A list of domains, URLs or IP addresses that a security vendor considers dangerous. Products that use the list block or warn about those addresses.
Can I check all security blacklists at once?
VirusTotal covers many vendors, but not all web filters and antivirus databases. A monitoring service checks a broader set.
Is it worth paying for blacklist removal?
If several vendors are involved or the listing is costing sales, a managed service saves time and avoids rejected requests.
Will removal from one list clear the others?
Sometimes, when lists share data, but usually you need to contact each vendor.