The IP Blacklist Check 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.
{"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://zylalabs.com/api/11758/ip+blacklist+check+api/22305/blacklist+verification?ip=8.8.8.8' --header 'Authorization: Bearer YOUR_API_KEY'
| 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 API returns data regarding the reputation of an IP address, including whether it is listed on blacklists, the number of lists checked, and detailed results for each blacklist.
Key fields include "ip" (the queried IP), "is_listed" (listing status), "checked_blacklists" (total lists 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" detailing each blacklist match, including name, status, reason, and response time.
The API provides information on whether an IP is listed on blacklists, the number of matches found, and detailed reasons for each listing, which aids in assessing potential risks associated with the IP.
Data accuracy is maintained through regular updates from multiple recognized blacklist sources, ensuring that the information reflects the latest status of IP addresses.
Typical use cases include network security assessments, automated blocking of malicious IPs, traffic monitoring, and forensic analysis to identify potential threats or abuse.
Users can customize requests by specifying the IP address they wish to check. The API does not currently support additional parameters for filtering or modifying the request.
If the API returns partial or empty results, users should check the "listed_count" field. A count of zero indicates no listings, while a non-zero count provides details on the specific blacklists where the IP is listed.
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