About this bot
DNSnifferBot is associated with DNSniffer and used for domain intelligence and certificate monitoring.
The primary identifying User-Agent token is DNSnifferBot. Representative HTTP request identity: Mozilla/5.0 (compatible; DNSnifferBot/1.0; +http://dnsniffer.com/crawler).
Directory status: Active. Identity classification: Verified with High confidence.
robots.txt behavior: yes under DNSnifferBot.
Collects domain intelligence, SSL certificate data, subdomain information, link relationships, and security-posture signals.
How to identify this bot
- User-agent and crawler identifiers
-
DNSnifferBotMozilla/5.0 (compatible; DNSnifferBot/1.0; +http://dnsniffer.com/crawler) - Also known as
- DNSnifferBot/1.0
Details
- Kind
- Domain intelligence crawler
- Family
- DNSniffer
- Purpose
- Domain intelligence and certificate monitoring
- Common Use
- Collects domain intelligence, SSL certificate data, subdomain information, link relationships, and security-posture signals.
- Respects robots.txt
- Yes
Verification
- Identity Type
- Officially documented
- Evidence Method
- Match the documented `DNSnifferBot/1.0` User-Agent and corroborate important decisions with operator-controlled context; the operator publishes transparent crawler behavior and robots policy.
- Detection Notes
- DNSnifferBot follows robots.txt and crawl-delay by default and backs off on error responses.
Website controls
- Robots.txt Snippet
User-agent: DNSnifferBot Disallow: /- Apache Rule
RewriteCond %{HTTP_USER_AGENT} "DNSnifferBot" [NC] RewriteRule ^ - [F,L]- Nginx Rule
if ($http_user_agent ~* "DNSnifferBot") { return 403; }