ant-html (Kuaishou) User Agent: What It Is & How to Block

01 · Operator

Who operates ant-html

Company: Kuaishou
Type: Social preview bot
Official docs: knownagents.com

02 · Behavior

What ant-html does

ant-html usually makes a single request shortly after a URL is shared on a Kuaishou service. It reads page metadata to build previews and feed entries. It does not normally crawl further.

03 · Impact

Why ant-html matters for your site

If you allow it

Builds previews when your links are shared on Kuaishou
Low request volume

If you block it

Little value if you have no audience on Kuaishou
Reported not to follow robots.txt

04 · Allow

How to allow ant-html

robots.txt

User-agent: ant-html
Allow: /

Cloudflare

# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "ant-html")
Action:     Skip › All Super Bot Fight Mode rules

# Also check Security › Bots: "Block AI bots" can block it regardless of robots.txt.

WordPress

# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: ant-html
Allow: /

nginx

# nginx serves every user agent by default.
# Make sure no rule like this blocks it:
# if ($http_user_agent ~* "ant\-html") { return 403; }

Apache

# Apache serves every user agent by default.
# Make sure .htaccess has no rule like this:
# RewriteCond %{HTTP_USER_AGENT} ant\-html [NC]
# RewriteRule .* - [F,L]

05 · Block

How to block ant-html

ant-html has been reported to ignore robots.txt. Block it at your CDN or web server as well.

robots.txt

# ant-html has been reported to ignore robots.txt.
# Add a Cloudflare, nginx or Apache rule as well.
User-agent: ant-html
Disallow: /

Cloudflare

# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "ant-html")
Action:     Block

WordPress

# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: ant-html
Disallow: /

nginx

# In your server { } block:
if ($http_user_agent ~* "ant\-html") {
    return 403;
}

Apache

# .htaccess
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ant\-html [NC]
RewriteRule .* - [F,L]
</IfModule>

06 · User agents

User agents we see for ant-html

The user agent published by the operator:

Mozilla/5.0 (compatible; ant-html/1.0; +https://kuaishou.com/bot)

07 · Verification

Is it really ant-html?

ant-html’s operator publishes no IP ranges or hostnames, so requests cannot be verified. Treat the user agent as a claim, and watch your logs for unusual request rates.

FAQ

Questions about ant-html

Who operates ant-html?

ant-html is operated by Kuaishou. Its user agent links to kuaishou.com/bot.

Why does ant-html visit my site?

It usually fetches a page right after someone shares its URL on a Kuaishou service, to build a preview.

How do I block ant-html?

Block the ant-html user agent at your server or firewall. Known Agents reports that it does not follow robots.txt.

ant-html is Kuaishou’s social preview bot