crawler4j

What is crawler4j?

About

crawler4j is an uncategorized agent. If you think this is incorrect or can provide additional detail about its purpose, please contact us. You can see how often crawler4j visits your website by setting up Dark Visitors Agent Analytics.

Expected Behavior

Behavior will vary depending on whether this agent is a search engine crawler, data scraper, archiver, one-off fetcher, etc.

Type

Uncategorized

Not currently assigned a type

Detail

Last Updated

6 hours ago

Insights

Top Website Robots.txts

1% of top websites are blocking crawler4j

Learn How →

Country of Origin

United States

crawler4j normally visits from the United States

Global Traffic

See All Global Bot & LLM Insights →

The percentage of all internet traffic coming from Uncategorized Agents

How Do I Get These Insights for My Website?

Use the WordPress plugin, Node.js package, or API to get started in seconds.

Set Up Agent Analytics

Robots.txt

Should I Block crawler4j?

It's difficult to say without a type. Its purposes could either be good or bad for your website, depending on what it is.

How Do I Block crawler4j?

You can block crawler4j or limit its access by setting user agent token rules in your website's robots.txt. Set up Dark Visitors Agent Analytics to check whether it's actually following them.

How Do I Block All Uncategorized Agents?

Serve a continuously updating robots.txt that blocks new uncategorized agents automatically.

Set Up Automatic Robots.txt

User Agent String crawler4j (https://github.com/rzo1/crawler4j/)

# In your robots.txt ...

User-agent: crawler4j # https://darkvisitors.com/agents/crawler4j
Disallow: /

⚠️ Manual Robots.txt Editing Is Not Scalable

New agents are created every day. We recommend setting up Dark Visitors Automatic Robots.txt if you want to block all agents of this type.