Y!J
Yahoo Japan search engine web crawler bot
About this crawler
Y!J is a web crawler identified by the regular-expression pattern Y!J in the User-Agent request header. It is categorised as search-engine. Use the regex above to detect, log, allow, or block Y!J traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.065%
Technical details
- Name
- Y!J
- Pattern
Y!J- Tags
- search-engine
- Reference
- https://www.yahoo-help.jp/app/answers/detail/p/595/a_id/42716/~/%E3%82%A6%E3%82%A7%E3%83%96%E3%83%9A%E3%83%BC%E3%82%B8%E3%81%AB%E3%82%A2%E3%82%AF%E3%82%BB%E3%82%B9%E3%81%99%E3%82%8B%E3%82%B7%E3%82%B9%E3%83%86%E3%83%A0%E3%81%AE%E3%83%A6%E3%83%BC%E3%82%B6%E3%83%BC%E3%82%A8%E3%83%BC%E3%82%B8%E3%82%A7%E3%83%B3%E3%83%88%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6
- Added
- 2015/05/26
- rDNS suffixes
.yahoo.co.jp,.yahoo.com,.yahoo.net- Instances
- 6 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely Y!J with forward-confirmed reverse DNS: the client IP's PTR record must end in one of the suffixes below and a forward A/AAAA lookup of that hostname must return the same IP. UA strings alone are spoofable; FCrDNS is not.
.yahoo.co.jp.yahoo.com.yahoo.net
Sample User-Agent strings
Y!J-ASR/0.1 crawler (http://www.yahoo-help.jp/app/answers/detail/p/595/a_id/42716/)
Y!J-BRJ/YATS crawler (http://help.yahoo.co.jp/help/jp/search/indexing/indexing-15.html)
Y!J-PSC/1.0 crawler (http://help.yahoo.co.jp/help/jp/search/indexing/indexing-15.html)
Y!J-BRW/1.0 crawler (http://help.yahoo.co.jp/help/jp/search/indexing/indexing-15.html)
Mozilla/5.0 (iPhone; Y!J-BRY/YATSH crawler; http://help.yahoo.co.jp/help/jp/search/indexing/indexing-15.html)
Mozilla/5.0 (compatible; Y!J SearchMonkey/1.0 (Y!J-AGENT; http://help.yahoo.co.jp/help/jp/search/indexing/indexing-15.html))
Block this crawler
robots.txt — disallow Y!J:
User-agent: Y!J
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Y!J [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Y!J") {
return 403;
}
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