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What is Cert Chief?

Direct Answer: Cert Chief is a security bot operated by Chief Tools that monitors HTTPS domains for certificate issues and configuration problems.

Operator: Chief Tools Type: Security Scanner Purpose: Certificate monitoring and security configuration checking

Cert Chief is a certificate monitoring tool that periodically crawls web properties to check their configuration and reports problems and changes when detected. It checks for certificate changes, expirations, and revocations, and monitors SSL/TLS configuration, DNSSEC, and DANE. The bot crawls domains every 5 minutes and supports notifications through various channels.

User-Agent Identification

The following user-agent strings identify Cert Chief in your live traffic data:

  • CertChief/8714fb40 (+https://cert.chief.app)

robots.txt Rules for Cert Chief

Respects robots.txt: Yes

Use the following robots.txt rules to control Cert Chief access:

# Block Cert Chief
User-agent: CertChief/8714fb40 (+https://cert.chief.app)
Disallow: /

# Allow Cert Chief
User-agent: CertChief/8714fb40 (+https://cert.chief.app)
Allow: /

Robots.txt is a directive, not a barrier

Chief Tools states that Cert Chief respects robots.txt. However, configuration mistakes, caching delays, and edge cases mean your directives may not always be followed as expected. Live traffic verification confirms whether Cert Chief actually obeys your rules in practice.

Need continuous verification across 500+ bots? Can AI See It automates this.

Crawl Behavior

Frequency:Every 5 Minutes

Request Pattern:Not Documented

Official Documentation Quotes

"We will let you know if a certificate for your domain changes, (almost) expires or is revoked but still used."

"Our bots crawl your https:// domains every 5 minutes for the most important issues, so you are notified almost instantly in case something got misconfigured."

Crawl Activity Index

Relative crawl activity for Cert Chief over the past 28 days. Higher values indicate increased crawling intensity compared to the period baseline.

View recent activity data (last 7 days)
Date Activity Index
Mar 26, 2026 88.0
Mar 27, 2026 82.7
Mar 28, 2026 83.1
Mar 29, 2026 81.8
Mar 30, 2026 87.3
Mar 31, 2026 90.2
Apr 1, 2026 88.8

Source: Cloudflare Radar

Why track Cert Chief traffic?

Identify and classify unknown crawler activity. Cert Chief may appear in your live traffic data with varying frequency. Tracking its behavior helps you decide whether to allow, throttle, or block it based on actual data.

Protect your crawl budget. Every bot request consumes server resources. Understanding what Cert Chief crawls helps you prioritize the crawlers that matter.

Log Verification

To verify Cert Chief traffic in your live traffic data:

  1. Search access logs for the user-agent strings listed above
  2. Check if the IP addresses match documented ranges (if provided by Chief Tools)
  3. Verify the crawl pattern matches documented behavior
  4. Use reverse DNS lookup for additional verification if available

Note: Observed behavior in production environments may differ from official documentation. Live traffic monitoring provides the only reliable verification of actual bot behavior.

Undocumented Information

The following information is not officially documented for Cert Chief:

  • crawl request pattern
  • IP verification method
  • JavaScript rendering

Official Documentation

View Official Cert Chief Documentation →

Information sourced from official documentation. Content generated with AI assistance.