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peer39_crawler

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Quick Facts

User-Agent:peer39_crawler
Category:SEO Tools
Safety:Safe
Blocking Impact:Varies — Evaluate before blocking
SEO Impact Score:0/10

What is peer39_crawler?

Peer39's crawler analyzes page content to provide contextual advertising data (brand safety, keywords) for advertisers.

Peer39's crawler analyzes page content to provide contextual advertising data (brand safety, keywords) for advertisers. peer39_crawler is a commercial SEO analytics crawler operated by . It builds backlink graphs, crawls for technical SEO issues, and tracks keyword rankings. The user-agent peer39_crawler is well-known and respected in the SEO industry. Blocking it removes your domain from 's index, preventing competitors from analysing your backlink profile via their platform. However, other users also lose visibility into links pointing TO your site — weigh this trade-off carefully.

What happens if you block peer39_crawler?

❓ **Impact Unknown** — The SEO consequences of blocking peer39_crawler are not fully documented. Before blocking, check your analytics to confirm whether this bot generates referral traffic, review your server logs for crawl frequency, and test in a staging environment if possible.
Generally safe to allow; provides legitimate crawling value.

How to block peer39_crawler with robots.txt

<code>User-agent: peer39_crawler</code> — Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.

Block completely (robots.txt)
User-agent: peer39_crawler Disallow: /
Allow all (robots.txt)
User-agent: peer39_crawler Allow: /
Block private only (robots.txt)
User-agent: peer39_crawler Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block peer39_crawler if ($http_user_agent ~* "peer39_crawler") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block peer39_crawler SetEnvIfNoCase User-Agent "peer39_crawler" bad_bot Order Allow,Deny Allow from all Deny from env=bad_bot
Meta robots tag
<meta name="robots" content="noindex, nofollow">
X-Robots-Tag header
X-Robots-Tag: noindex, nofollow

Is peer39_crawler safe to allow?

Yes, peer39_crawler is a **safe and legitimate** crawler. It is operated by , which publicly documents its crawler at an official URL and follows the Robots Exclusion Protocol (RFC 9309). The user-agent string peer39_crawler is verifiable via reverse-DNS lookup on the crawling IP addresses. You can safely allow it unless you have a specific reason to block (e.g., AI training opt-out or SEO tool visibility).
Verify by reverse-DNS lookup: legitimate peer39_crawler requests resolve to 's domain.

What does peer39_crawler do?

Understanding peer39_crawler's purpose helps you decide whether to allow or block it.

Frequently Asked Questions

What is the official user-agent string for peer39_crawler?
The official user-agent string for peer39_crawler is: peer39_crawler. This is the exact string you must use in robots.txt, Nginx, Apache, or Cloudflare firewall rules to target this bot. User-agent matching in robots.txt is case-insensitive, but the string must be spelled correctly. You can verify that a request genuinely comes from peer39_crawler by performing a reverse-DNS lookup on the source IP — legitimate bots resolve back to their operator's domain.
Is peer39_crawler safe?
Yes, peer39_crawler is a **safe and legitimate** crawler. It is operated by , which publicly documents its crawler at an official URL and follows the Robots Exclusion Protocol (RFC 9309). The user-agent string peer39_crawler is verifiable via reverse-DNS lookup on the crawling IP addresses. You can safely allow it unless you have a specific reason to block (e.g., AI training opt-out or SEO tool visibility).
Will blocking peer39_crawler hurt my SEO?
❓ **Impact Unknown** — The SEO consequences of blocking peer39_crawler are not fully documented. Before blocking, check your analytics to confirm whether this bot generates referral traffic, review your server logs for crawl frequency, and test in a staging environment if possible.
How do I block peer39_crawler in robots.txt?
Add the following lines to your /robots.txt file: 
User-agent: peer39_crawler
Disallow: /
This instructs peer39_crawler not to crawl any path on your site. The Disallow: / directive covers the entire domain including subfolders. To only block specific sections, replace / with the path (e.g., Disallow: /blog/). Note: robots.txt is publicly readable — any bot or human can inspect it at yourdomain.com/robots.txt.
Does peer39_crawler respect robots.txt?
Yes — peer39_crawler is a well-behaved bot operated by . It fetches and parses /robots.txt before crawling any page, following RFC 9309.
How do I verify if peer39_crawler is crawling my site?
Search your web server access logs for the string peer39_crawler (case-insensitive grep: grep -i "peer39_crawler" /var/log/nginx/access.log). You can also check Google Search Console → Coverage → Crawl Stats for Googlebot variants. For peer39_crawler specifically, filter by user-agent in your log analysis tool (GoAccess, AWStats, etc.).
What is the crawl frequency of peer39_crawler?
peer39_crawler crawls at a moderate rate. If you notice excessive traffic in your logs, you can add a Crawl-delay directive: 
User-agent: peer39_crawler
Crawl-delay: 10
(10 second delay between requests).
Can I block peer39_crawler from specific pages only?
Yes. Instead of a global Disallow: / you can restrict peer39_crawler to specific paths: 
User-agent: peer39_crawler
Disallow: /private/
Disallow: /staging/
Allow: /
This allows peer39_crawler everywhere except the listed paths. Path matching in robots.txt uses prefix matching — Disallow: /private/ blocks /private/page.html but NOT /public/private/.
Why would I want to block peer39_crawler?
There are two main reasons to block peer39_crawler: 1. **Competitive intelligence**: users (your competitors) can analyse your backlink profile, keyword rankings, and site structure. Blocking prevents this. 2. **Crawl budget**: If your site is large, SEO tool crawlers consume crawl bandwidth without contributing to search rankings. Blocking frees up server resources for search engine bots. The trade-off: you also become invisible in 's backlink database, meaning links pointing TO your site from other domains won't appear in competitor reports either.

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