loc.gov/programs/web-archiving

archiver loc\.gov\/programs\/web-archiving

Government web archiver preserving cultural content for long-term access

About this crawler

loc.gov/programs/web-archiving is a web crawler identified by the regular-expression pattern loc\.gov\/programs\/web-archiving in the User-Agent request header. It is categorised as archiver. Use the regex above to detect, log, allow, or block loc.gov/programs/web-archiving traffic in your web server, CDN edge rules, or robots.txt.

Block-rate · top 25k sites

No block-rate data for this crawler.

Technical details

Name
loc.gov/programs/web-archiving
Pattern
loc\.gov\/programs\/web-archiving
Tags
archiver
Reference
https://www.loc.gov/programs/web-archiving/for-site-owners
Added
2026/04/17
Instances
1 known sample(s)

Sample User-Agent strings

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36 (+https://www.loc.gov/programs/web-archiving/for-site-owners/)

Block this crawler

robots.txt — disallow loc.gov/programs/web-archiving:

User-agent: loc.gov/programs/web-archiving Disallow: /

Apache .htaccess — return 403:

RewriteEngine On RewriteCond %{HTTP_USER_AGENT} loc\.gov\/programs\/web-archiving [NC] RewriteRule .* - [F,L]

Nginx — return 403 inside a server block:

if ($http_user_agent ~* "loc\\.gov\\/programs\\/web-archiving") { return 403; }
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