What is BLEXBot?
It collects and checks the links on pages to map how sites link to each other, for internet marketers. SE Ranking now documents BLEXBot.
Crawls for an SEO product: backlink indexes, site audits, rank data. It sends no visitors; blocking it is common and harmless.
SE Ranking says BLEXBot makes at most one request every 3 seconds and can take up to 10 minutes to stop after a robots.txt change.
BLEXBot user agent
SE Ranking documents this user agent for BLEXBot. Version numbers in it change over time, so match on the name, not the whole string.
Mozilla/5.0 (compatible; BLEXBot/1.0; +https://help.seranking.com/en/blex-crawler)Should you block BLEXBot?
Block it freely if the load bothers you. It sends no visitors; the only cost is that the tool’s users, your competitors included, see less of your site.
How to block BLEXBot in robots.txt
Add a group for its token to robots.txt at the root of your site.
A bot follows only the group that names it, so it ignores your User-agent: * rules once it has a group of its own. Repeat any paths you also want kept from it there.
User-agent: BLEXBot
Disallow: /How to verify a request is really BLEXBot
Anyone can send any user agent, so the string alone proves nothing.
Or check by reverse DNS: look up the hostname of the request’s IP, confirm it ends in seranking.com, then look that hostname up again and confirm it points back to the same IP.
See when BLEXBot reads your site
Bots don’t run JavaScript analytics, so a script tag never sees them. invisit records crawler reads on the server instead, through its server SDK or a Cloudflare Worker, and shows which bots read which pages, next to your visitors.
Checked against SE Ranking’s own documentation on . Something changed? Write to help@invisit.dev.