What is search.marginalia.nu?
search.marginalia.nu is a web crawler for Marginalia Search, a noncommercial search engine that focuses on indexing old websites, personal websites, and blogs. The search engine helps content that struggles with discoverability in the SEO-optimized web. You can set up Agent Analytics to see when search.marginalia.nu visits your website.
Category
| Example User Agent | search.marginalia.nu |
| Operated By | Marginalia |
| Triggered By | Automated crawl |
| Used for AI Model Training | Not expected |
| Affects AI Chat & Search Visibility | Possibly |
| Expected To Follow Robots.txt | Yes |
Why Is search.marginalia.nu Visiting My Website?
search.marginalia.nu is adding new or changed pages to its search index. It may have discovered your site through links, a sitemap, or direct submission.
Should I Block search.marginalia.nu?
No, unless you want to remove your pages from that search engine. search.marginalia.nu supplies its index, so blocking it can eliminate your visibility and organic traffic there. Nearly every website should allow this category. For context, 7% of the top websites we track currently have robots.txt rules for search.marginalia.nu.
How Do I Block search.marginalia.nu Using Robots.txt?
Add this rule to your robots.txt file to block search.marginalia.nu from accessing your website, or use Automatic Robots.txt to block all search engine crawlers at once. You can customize which pages are blocked by swapping out / for a different path.
User-agent: search.marginalia.nu # https://knownagents.com/agents/search-marginalia-nu
Disallow: /Insights for search.marginalia.nu
As of October 29, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the top 1000 websites and their robots.txt files.
Robots.txt Compliance
Country of Origin
Robots.txt Blocked Percentage
Frequently Asked Questions
What Traffic Patterns Should I Expect From search.marginalia.nu?
search.marginalia.nu follows an algorithmic schedule shaped by your site's popularity, update cadence, and domain authority. It generally spreads requests across recurring crawl passes, throttles itself to limit server load, and respects crawl rules more reliably than most other bots.
Does search.marginalia.nu Follow Robots.txt Rules?
search.marginalia.nu is expected to follow robots.txt rules, so a disallow rule is the appropriate first step if you want to block it. Automatic Robots.txt can add and maintain that rule, while Agent Analytics lets you verify whether search.marginalia.nu respects it.
Is search.marginalia.nu Used for AI Model Training?
Not ordinarily. search.marginalia.nu is not categorized as an AI training scraper or data provider, so AI model training is not its expected purpose.
Does Blocking search.marginalia.nu Affect AI Search or Citations?
Blocking search.marginalia.nu can remove your pages from the search engine it supplies. That may also affect AI products that rely on the same index, but it does not directly control unrelated AI search services.
Does search.marginalia.nu Access Private Content?
No special access. search.marginalia.nu can reach only content available to anonymous visitors and does not sign in. Make sure sensitive content is not public by mistake.
How Can I Verify a Request From search.marginalia.nu?
Agent Analytics tracks search.marginalia.nu visits in real time. You can also check your server logs for requests whose user-agent string contains "search.marginalia.nu". Look for recurring passes that revisit changed pages and discover new ones. Because search.marginalia.nu does not publish a verification method, any client can claim its identity and a log match is only a clue.
How Is search.marginalia.nu Different From Other Marginalia Agents?
Marginalia operates separate agents for different purposes, so each agent should be evaluated and controlled independently.
- Marginalia Search: Marginalia Search is a search engine crawler operated by Marginalia.