{"ip":"8.8.8.8","is_listed":true,"checked_blacklists":61,"listed_count":4,"timeout_count":0,"ok_count":57,"listed_blacklists":[{"name":"\u00a0OK","status":"LISTED","reason":"8.8.8.8 was listed","ttl":0,"response_time_ms":0},{"name":"\u00a0OK","status":"LISTED","reason":"8.8.8.8 was listed","ttl":0,"response_time_ms":0},{"name":"\u00a0OK","status":"LISTED","reason":"8.8.8.8 was listed","ttl":0,"response_time_ms":0},{"name":"\u00a0OK","status":"LISTED","reason":"8.8.8.8 was listed","ttl":0,"response_time_ms":0}],"timeouts":[],"checked_at":"2026-01-23T12:54:22Z","_cached":true,"_cache_key":"ipx_api:blacklist_check:8_8_8_8"}
curl --location --request GET 'https://pr213-testing.zylalabs.com/api/11766/fetch+ip+blacklist+data+api/22313/blacklist+verification?ip=8.8.8.8' --header 'Authorization: Bearer YOUR_API_KEY'
After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Fetch IP Blacklist Data API simply include your bearer token in the Authorization header.
| Header | Description |
|---|---|
Authorization
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Required
Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.
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The Fetch IP Blacklist Data API is designed to assess the reputation of an IP address by simultaneously querying multiple recognized blacklists. Its main purpose is to determine whether an IP address has been classified as potentially risky due to suspicious activity, previous abuse, or behavior associated with spam, malware, or unauthorized access. This type of API is essential in environments where network traffic security and reliability are critical.
The endpoint provides a clear summary of the status of the analyzed IP, indicating whether it is listed on at least one blacklist, how many lists were queried, and how many matches were detected. In addition, it offers additional metrics such as the number of lists that responded correctly, those that did not have any listings, and possible wait times during the query. This information allows you to evaluate not only the potential risk, but also the coverage and reliability of the analysis performed.
One of the most valuable aspects of the API is the detail for each blacklist where the IP is listed. For each match, data such as the name of the list, the status of the result, the reason for the listing, and additional technical parameters are included. This facilitates audits, forensic analysis, and informed decision-making, such as applying automatic blocks, flagging traffic for review, or generating security alerts.
The API returns real-time data on the reputation of an IP address, including whether it is listed on blacklists, the number of blacklists checked, and detailed information about each listing, such as the reason for the listing and response times.
Key fields include "ip" (the queried IP), "is_listed" (listing status), "checked_blacklists" (total blacklists checked), "listed_count" (number of listings), and "listed_blacklists" (details of each blacklist match).
The response is structured in JSON format, with a main object containing summary fields and an array of "listed_blacklists" that provides detailed information for each blacklist where the IP is listed.
The endpoint provides information on the listing status of an IP, the number of blacklists queried, the count of matches, and detailed reasons for each listing, which aids in assessing potential risks.
Data accuracy is maintained through querying multiple recognized blacklists, ensuring that the information reflects the most current status of the IP address across various sources.
Typical use cases include assessing the risk of incoming traffic, implementing automatic blocks on malicious IPs, flagging suspicious activity for review, and generating security alerts based on blacklist status.
Users can customize their requests by specifying the IP address they want to check. The API is designed to handle various IP formats, including IPv4 and IPv6.
Users can expect responses indicating whether an IP is listed, the number of blacklists checked, and detailed reasons for listings. Patterns may include multiple listings for high-risk IPs or no listings for clean IPs.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
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The free trial lasts for 7 days and allows you to make up to 50 API requests.
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