Safe Data Scrapers

Crawlspace

Operator not verified

Quick Facts

User-Agent:
Crawlspace
Category:
Data Scrapers
Safety:
Safe
Blocking Impact:
Low - No SEO ranking impact
SEO Impact Score:
2/10

What is Crawlspace?

A crawler associated with digital archiving or data preservation.

A crawler associated with digital archiving or data preservation. Crawlspace is a data aggregation crawler. Unlike search bots or AI crawlers, its purpose is typically to collect content for private datasets, price monitoring, or research. Blocking Crawlspace via robots.txt or at the server level has NO negative SEO impact. If you see excessive crawl volume from this bot in your logs, a hard block is recommended.

What happens if you block Crawlspace?

✅ **Minimal Impact** - Blocking Crawlspace has no meaningful effect on your search engine rankings or organic traffic.
Generally safe to allow; provides legitimate crawling value.

How to block Crawlspace with robots.txt

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

Block completely (robots.txt)
User-agent: Crawlspace Disallow: /
Allow all (robots.txt)
User-agent: Crawlspace Allow: /
Block private only (robots.txt)
User-agent: Crawlspace Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block Crawlspace if ($http_user_agent ~* "Crawlspace") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block Crawlspace SetEnvIfNoCase User-Agent "Crawlspace" 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 Crawlspace safe to allow?

Yes, Crawlspace is a **safe and legitimate** crawler. Its operator is not publicly documented. It follows the Robots Exclusion Protocol (RFC 9309). The user-agent string Crawlspace 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 Crawlspace requests resolve to unknown's domain.

What does Crawlspace do?

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

  • Extracts content, prices, or data from websites
  • May be used for competitive intelligence
  • Often operates without explicit permission
  • Can increase server load and bandwidth usage
  • May violate terms of service or copyright

Frequently Asked Questions

What is the official user-agent string for Crawlspace?
The official user-agent string for Crawlspace is: Crawlspace. 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 Crawlspace by performing a reverse-DNS lookup on the source IP - legitimate bots resolve back to their operator's domain.
Is Crawlspace safe?
Yes, Crawlspace is a **safe and legitimate** crawler. Its operator is not publicly documented. It follows the Robots Exclusion Protocol (RFC 9309). The user-agent string Crawlspace 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 Crawlspace hurt my SEO?
✅ **Minimal Impact** - Blocking Crawlspace has no meaningful effect on your search engine rankings or organic traffic.
How do I block Crawlspace in robots.txt?
Add the following lines to your /robots.txt file: 
User-agent: Crawlspace
Disallow: /
This instructs Crawlspace 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 Crawlspace respect robots.txt?
Yes - Crawlspace is a well-behaved bot. It fetches and parses /robots.txt before crawling any page, following RFC 9309.
How do I verify if Crawlspace is crawling my site?
Search your web server access logs for the string Crawlspace (case-insensitive grep: grep -i "Crawlspace" /var/log/nginx/access.log). You can also check Google Search Console → Coverage → Crawl Stats for Googlebot variants. For Crawlspace specifically, filter by user-agent in your log analysis tool (GoAccess, AWStats, etc.).
What is the crawl frequency of Crawlspace?
Crawlspace crawls at a moderate rate. If you notice excessive traffic in your logs, you can add a Crawl-delay directive: 
User-agent: Crawlspace
Crawl-delay: 10
(10 second delay between requests).
Can I block Crawlspace from specific pages only?
Yes. Instead of a global Disallow: / you can restrict Crawlspace to specific paths: 
User-agent: Crawlspace
Disallow: /private/
Disallow: /staging/
Allow: /
This allows Crawlspace everywhere except the listed paths. Path matching in robots.txt uses prefix matching - Disallow: /private/ blocks /private/page.html but NOT /public/private/.
Is Crawlspace causing high server load?
If Crawlspace is generating excessive requests, you can: 1. Add Crawl-delay: 30 below the User-agent directive in robots.txt. 2. Rate-limit the user-agent via Nginx's limit_req_zone or Apache's mod_ratelimit. 3. Block it outright at Cloudflare WAF with rule: http.user_agent contains "Crawlspace". 4. Use fail2ban to auto-block IPs exceeding request thresholds.

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