Directory/Categories/Security/DNSnifferBot

DNSnifferBot

GoodBotVerifiedBOT

Platform for domain intelligence that provides comprehensive domain and subdomain discovery services. Operated by DNSniffer.

Operator website ↗

GoodBot

Assessment

Security

What is DNSnifferBot?

DNSnifferBot is operated by DNSniffer to power their domain intelligence and security auditing platform. It systematically crawls websites to collect data on SSL certificates, subdomain structures, and inter-domain relationships, which are then used to provide security insights and vulnerability alerts to users. The bot is designed with transparency in mind, adhering to standard web protocols including robots.txt and adaptive backoff strategies when encountering server errors.

Helpful — The bot is transparent, respects robots.txt, and provides clear mechanisms for site owners to control or block its activity.

Identification

Bot name

DNSnifferBot

Operator

DNSniffer

How we rated this bot

Verified by Cloudflare, which confirms who runs it, with no widespread reports of abuse.

Names itself honestly

Yes

Verified by Cloudflare

Yes

Says it follows robots.txt and opt-outs

Yes

Ignores site rules

None found

Disguises itself or evades blocks

None found

Overloads sites

None found

How widely people complain

No complaint about this bot in the evidence

Reddit discussion

There is no Reddit discussion of this bot in the evidence

What we read

Why it crawls your site

The bot crawls the web to maintain an up-to-date database of domain infrastructure and security posture. By indexing certificate data and link relationships, it enables DNSniffer to alert site owners to expired SSL certificates, misconfigurations, and potential security risks. Operators can verify the bot's identity through its consistent user-agent string and the publicly documented crawling policies provided on the DNSniffer website.

Block or allow DNSnifferBot

Block it

Add a Disallow rule for DNSnifferBot in your robots.txt file. You can also block at the server level using your web server configuration or CDN firewall rules to filter requests matching the user-agent string.

# Block DNSnifferBot from crawling your entire site
User-agent: DNSnifferBot
Disallow: /

# Allow DNSnifferBot full access
User-agent: DNSnifferBot
Allow: /