Published on 2025-08-07T06:18:08Z

VelenPublicWebCrawler

VelenPublicWebCrawler is a web crawler from Hunter.io, a company specializing in business intelligence and professional contact information. The bot's purpose is to scan public web pages to collect business-related data, such as corporate contact information and company profiles. It is designed to be a well-behaved crawler, with a conservative crawl rate to minimize server impact.

What is VelenPublicWebCrawler?

VelenPublicWebCrawler is the web crawler for Hunter.io, designed to analyze public internet pages. It is a data collection tool focused on business intelligence and professional networking information. The crawler identifies itself in server logs with the user-agent string Mozilla/5.0 (compatible; VelenPublicWebCrawler/1.0; +https://velen.io). It uses a conservative approach, crawling only one page at a time with a minimum 2-second interval between requests to the same domain to minimize server impact. It only accesses publicly available pages.

Why is VelenPublicWebCrawler crawling my site?

VelenPublicWebCrawler is crawling your site to collect publicly available business information. It targets business-related data points such as corporate contact information, professional profiles, and company structure details. The crawler's visit is part of Hunter.io's data collection objectives to build business datasets. Its crawling frequency is deliberately measured to avoid creating a noticeable load on websites.

What is the purpose of VelenPublicWebCrawler?

The purpose of VelenPublicWebCrawler is to support Hunter.io's mission of aggregating public business information to facilitate connections between organizations. The data it collects is processed to create specialized datasets for sales intelligence, recruitment, and market research. The crawler's work ultimately supports Hunter.io's business services, which include company search and contact discovery. While website owners do not directly benefit from being crawled, the bot is designed to operate ethically and with a light footprint.

How do I block VelenPublicWebCrawler?

To prevent VelenPublicWebCrawler from accessing your website, you can add a specific disallow rule to your robots.txt file. This is the standard method for managing crawler access.

To block this bot, add the following lines to your robots.txt file:

User-agent: VelenPublicWebCrawler
Disallow: /

How to verify the authenticity of the user-agent operated by Hunter.io?

Reverse IP lookup technique

To verify user-agent authenticity, you can use host linux command two times with the IP address of the requester.
  1. > host IPAddressOfRequest
    This command returns the reverse lookup hostname (e.g., 4.4.8.8.in-addr.arpa.).
  2. > host ReverseDNSFromTheOutputOfFirstRequest
If the output matches the original IP address and the domain is associated with a trusted operator (e.g., Hunter.io), the user-agent can be considered legitimate.

IP list lookup technique

Some operators provide a public list of IP addresses used by their crawlers. This list can be cross-referenced to verify a user-agent's authenticity. However, both operators and website owners may find it challenging to maintain an up-to-date list, so use this method with caution and in conjunction with other verification techniques.