SplitSignalBot
Semrush •
Web Crawler
What is SplitSignalBot?
Semrush lists SplitSignalBot as the separate identity for SplitSignal, its SEO A/B testing product, and gives a dedicated robots.txt disallow example. This is not the same as the general SemrushBot used to build backlink data. Semrush publishes the bot token on its crawler page but not one fixed full browser-style request header, so the value shown is the documented identifier only.
User Agent String
SplitSignalBot
How to Control SplitSignalBot
Block Completely
To prevent SplitSignalBot from accessing your entire website, add this to your robots.txt file:
# Block SplitSignalBot
User-agent: SplitSignalBot
Disallow: /
Block Specific Directories
To restrict access to certain parts of your site while allowing others:
User-agent: SplitSignalBot
Disallow: /admin/
Disallow: /private/
Disallow: /wp-admin/
Allow: /public/
Set Crawl Delay
To slow down the crawl rate (note: not all bots respect this directive):
User-agent: SplitSignalBot
Crawl-delay: 10
How to Verify SplitSignalBot
Verification Method:
A claimed user-agent can be spoofed. Semrush does not recommend fixed IP blocks; confirm disputed requests with Semrush bot support and log evidence.
A claimed user-agent can be spoofed. Semrush does not recommend fixed IP blocks; confirm disputed requests with Semrush bot support and log evidence.
Learn more in the official documentation.
Detection Patterns
Multiple ways to detect SplitSignalBot in your application:
Basic Pattern
/SplitSignalBot/i
Strict Pattern
/^SplitSignalBot$/
Flexible Pattern
/SplitSignalBot[\s\/]?[\d\.]*?/i
Vendor Match
/.*Semrush.*SplitSignalBot/i
Implementation Examples
// PHP Detection for SplitSignalBot
function detect_splitsignalbot() {
$user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
$pattern = '/SplitSignalBot/i';
if (preg_match($pattern, $user_agent)) {
// Log the detection
error_log('SplitSignalBot detected from IP: ' . $_SERVER['REMOTE_ADDR']);
// Set cache headers
header('Cache-Control: public, max-age=3600');
header('X-Robots-Tag: noarchive');
// Optional: Serve cached version
if (file_exists('cache/' . md5($_SERVER['REQUEST_URI']) . '.html')) {
readfile('cache/' . md5($_SERVER['REQUEST_URI']) . '.html');
exit;
}
return true;
}
return false;
}
# Python/Flask Detection for SplitSignalBot
import re
from flask import request, make_response
def detect_splitsignalbot():
user_agent = request.headers.get('User-Agent', '')
pattern = r'SplitSignalBot'
if re.search(pattern, user_agent, re.IGNORECASE):
# Create response with caching
response = make_response()
response.headers['Cache-Control'] = 'public, max-age=3600'
response.headers['X-Robots-Tag'] = 'noarchive'
return True
return False
# Django Middleware
class splitsignalbotMiddleware:
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
if self.detect_bot(request):
# Handle bot traffic
pass
return self.get_response(request)
// JavaScript/Node.js Detection for SplitSignalBot
const express = require('express');
const app = express();
// Middleware to detect SplitSignalBot
function detect_splitsignalbot(req, res, next) {
const userAgent = req.headers['user-agent'] || '';
const pattern = /SplitSignalBot/i;
if (pattern.test(userAgent)) {
// Log bot detection
console.log('SplitSignalBot detected from IP:', req.ip);
// Set cache headers
res.set({
'Cache-Control': 'public, max-age=3600',
'X-Robots-Tag': 'noarchive'
});
// Mark request as bot
req.isBot = true;
req.botName = 'SplitSignalBot';
}
next();
}
app.use(detect_splitsignalbot);
# Apache .htaccess rules for SplitSignalBot
# Block completely
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} SplitSignalBot [NC]
RewriteRule .* - [F,L]
# Or redirect to a static version
RewriteCond %{HTTP_USER_AGENT} SplitSignalBot [NC]
RewriteCond %{REQUEST_URI} !^/static/
RewriteRule ^(.*)$ /static/$1 [L]
# Or set environment variable for PHP
SetEnvIfNoCase User-Agent "SplitSignalBot" is_bot=1
# Add cache headers for this bot
<If "%{HTTP_USER_AGENT} =~ /SplitSignalBot/i">
Header set Cache-Control "public, max-age=3600"
Header set X-Robots-Tag "noarchive"
</If>
# Nginx configuration for SplitSignalBot
# Map user agent to variable
map $http_user_agent $is_splitsignalbot {
default 0;
~*SplitSignalBot 1;
}
server {
# Block the bot completely
if ($is_splitsignalbot) {
return 403;
}
# Or serve cached content
location / {
if ($is_splitsignalbot) {
root /var/www/cached;
try_files $uri $uri.html $uri/index.html @backend;
}
try_files $uri @backend;
}
# Add headers for bot requests
location @backend {
if ($is_splitsignalbot) {
add_header Cache-Control "public, max-age=3600";
add_header X-Robots-Tag "noarchive";
}
proxy_pass http://backend;
}
}
Should You Block This Bot?
Recommendations based on your website type:
| Site Type | Recommendation | Reasoning |
|---|---|---|
| E-commerce | Optional | Evaluate based on bandwidth usage vs. benefits |
| Blog/News | Allow | Increases content reach and discoverability |
| SaaS Application | Block | No benefit for application interfaces; preserve resources |
| Documentation | Selective | Allow for public docs, block for internal docs |
| Corporate Site | Limit | Allow for public pages, block sensitive areas like intranets |
Advanced robots.txt Configurations
E-commerce Site Configuration
User-agent: SplitSignalBot
Crawl-delay: 5
Disallow: /cart/
Disallow: /checkout/
Disallow: /my-account/
Disallow: /api/
Disallow: /*?sort=
Disallow: /*?filter=
Disallow: /*&page=
Allow: /products/
Allow: /categories/
Sitemap: https://example.com/sitemap.xml
Publishing/Blog Configuration
User-agent: SplitSignalBot
Crawl-delay: 10
Disallow: /wp-admin/
Disallow: /drafts/
Disallow: /preview/
Disallow: /*?replytocom=
Allow: /
SaaS/Application Configuration
User-agent: SplitSignalBot
Disallow: /app/
Disallow: /api/
Disallow: /dashboard/
Disallow: /settings/
Allow: /
Allow: /pricing/
Allow: /features/
Allow: /docs/
Quick Reference
User Agent Match
SplitSignalBot
Robots.txt Name
SplitSignalBot
Category
seo
Respects robots.txt
Yes
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