StevenBlack Hosts Blocklist Checker
Check whether a hostname or website is on the StevenBlack hosts blocklist, the full list with adware, malware, fake news, gambling, porn, and social media domains.
Input
Protected by Cloudflare Turnstile
Output
| List entry | Match |
|---|---|
| Check a hostname to see the matching list entries. | |
Readme
What is a hosts blocklist?
A hosts file maps hostnames to IP addresses before DNS is asked. Blocklists use this by pointing unwanted hostnames at 0.0.0.0, an address that goes nowhere, so the device can't connect to ad servers, trackers, or malware sites. Steven Black's hosts project is one of the most widely used of these lists. It merges many sources, such as AdAway, MVPS, Dan Pollock's list, URLhaus, and KADhosts, into one file without duplicates, and it is used directly in hosts files and as a source list in blockers like Pi-hole and AdGuard Home.
The project publishes the list in several variants: the unified list blocks adware and malware, and optional extensions add fake news, gambling, porn, and social media domains.
Tool description
This tool checks a hostname or website address against the largest StevenBlack variant: the unified hosts list with all four extensions, which contains every entry of every other variant. Paste a hostname or a full URL, and the tool shows whether that exact hostname is on the list, which of its parent domains are listed, and which hostnames under it are listed.
Features
- Accepts bare hostnames and full URLs; the path, port, and query are ignored
- Checks the full list of more than 165,000 hostnames, covering adware, malware, fake news, gambling, porn, and social media
- Lists parent domains on the list, such as
doubleclick.netforad.doubleclick.net - Lists hostnames under the checked domain that are on the list
- Handles internationalized domain names by converting them to punycode
- Shows the size of the list and when it was last updated
How it works
A hosts file matches exact hostnames only: blocking example.com does not block www.example.com or ads.example.com, which is why the list often includes both example.com and www.example.com. The "On StevenBlack list" field answers that exact question. Some blockers that read the list also block subdomains of listed domains, so the tool reports listed parent domains separately. Checking a whole site, such as google.com, also shows the listed hostnames under it, usually ad and tracking servers.
Limitations
- The list is updated regularly but not in real time, so very new domains may be missing.
- Only the StevenBlack list is checked. Other blocklists and the rules in your own blocker may give a different result.
- IP addresses are not checked, because the list contains hostnames only.