What is heritrix?
heritrix is an archiver operated by Internet Archive. Agent Analytics can track when it visits your website.
Category
Expected Behavior
heritrix returns on a cadence to capture full snapshots of your pages for the historical record. Expect complete page fetches rather than metadata checks, at a frequency that rises with your site's popularity and how often your content changes.
Overview
| Operated By | Internet Archive |
| Expected To Follow Robots.txt | Yes |
| Insights Last Updated | July 6, 2026 |
Robots.txt Blocked Percentage
Country of Origin
Robots.txt Blocking Trend
As of July 6, 2026, 1% of top websites block heritrix in their robots.txt files.
Overall Archiver Traffic
As of July 6, 2026, 0.1% of all web traffic came from archivers.
Top Visited Website Categories
This data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the world's top 1000 websites and their robots.txt files.
heritrix's User Agent
| User Agent | Mozilla/5.0 (compatible; heritrix/3.7.0 +http://webarchiv.cz/kontakty) |
Access other known user agents and IP addresses using the Enterprise API.
How To Block heritrix
Add this rule to your robots.txt file to block heritrix from accessing your entire website. You can customize which pages are blocked by swapping out / for a different path.
User-agent: heritrix # https://knownagents.com/agents/heritrix
Disallow: /Frequently Asked Questions
Should I Block heritrix?
Almost never. heritrix preserves snapshots of your pages so the record survives redesigns, migrations, and dead links. Blocking only stops new captures. Snapshots that already exist stay public until you ask the archive itself to remove them. For comparison, 1% of the top websites we track already have robots.txt rules for heritrix.
Does heritrix Respect Robots.txt?
Yes. heritrix is expected to honor robots.txt rules, so a disallow rule is the right first move. Automatic Robots.txt adds and maintains that rule for you, and Agent Analytics confirms heritrix actually honors it.
Does heritrix Access Private Content?
It archives only what any anonymous visitor can see. Anything public at crawl time can stay retrievable in heritrix's archive long after you take it down.
Why Is heritrix Visiting My Website?
heritrix is preserving your pages as part of the historical record. Visits recur on a schedule so the archive can capture how your content changes over time.
How Can I Tell if heritrix Is Visiting My Website?
Agent Analytics tracks heritrix visits in real time alongside every other known AI agent, crawler, and scraper. You can also check your server logs for requests whose user agent string contains "heritrix". Look for periodic full page captures that recur on a schedule. Keep in mind that heritrix doesn't publish a verification method, so any client can claim its user agent string and a log match is a hint rather than proof.