seznambot.com

What It Is

SeznamBot API is a lightweight REST API under the seoapi.com ecosystem for checking whether a given IPv4 or IPv6 address belongs to SeznamBot’s official web crawler IPs. It is called via HTTPS GET and returns JSON by default; with compact=1, it can return plain-text true/false, making it easy to embed in scripts, spreadsheets, or log analysis workflows.

Core Capabilities and Integration

The API’s main value is that it simplifies a verification process that would otherwise require local forward and reverse DNS lookups into a single remote query. Its database includes historical records, which is useful for analyzing old logs where IPs may no longer resolve. It also continuously updates IPs and User-Agents based on SeznamBot crawling activity. The documentation provides examples for curl, Google Spreadsheets, and Python 3 requests, showing that it is fairly language-agnostic. The same site also offers similar APIs for Googlebot, Bingbot, YandexBot, Baiduspider, Sogou Spider, and others, making it suitable for building multi-search-engine crawler identification workflows.

Pricing and Usage Limits

The documentation clearly states that the API is free, anonymous, and requires no authentication, giving it strong value for money. However, it currently has rate limiting, and the specific limits are not publicly disclosed. The official recommendation is to cache 200-status responses locally for at least 6 hours to reduce repeated queries. For large-scale internal use, users are advised to contact Fili.

Pros and Cons

Its strengths are an extremely simple interface, quick onboarding, flexible response formats, and historical IP data, making it highly practical for technical SEO and server log auditing. The drawbacks are also clear: this is a personal website and a “for-fun project,” with a disclaimer stating that the data may be incomplete, may contain errors, and comes with no guarantees. The documentation does not provide an SLA, error codes, rate-limit quotas, SDKs, or enterprise support commitments, nor does it say whether the project is open source or self-hostable.

Who It’s For and Access from China

It is suitable for technical SEO specialists, webmasters, operations teams, and security analysts who need to identify genuine SeznamBot traffic, investigate spoofed crawlers, or analyze access logs in bulk. The documentation does not provide information about access from mainland China, so real-world testing is required. Since the service is free, there is currently no payment information. If you cannot rely on this service, you could consider similar search bot APIs or use local DNS forward/reverse verification as an alternative.