facebookexternalhit
by Meta
Social preview UA + IP range
Fetches a page to build the link preview card shown when someone shares it.
facebookexternalhit is an AI-related crawler operated by Meta.
What it usually means
Meta crawled this page as part of its AI crawling.
How to identify it
User-Agent tokens
facebookexternalhit robots.txt stanza
User-agent: facebookexternalhit How it's verified
Published IP-range endpoints
Currently loaded ranges (sample) Refreshed Jul 20, 2026
57.141.4.0/24157.240.238.0/2457.144.114.0/2357.145.8.0/232a03:2880:f013::/48157.240.12.0/24157.240.14.0/242a03:2880:f16d::/4857.144.178.0/232a03:2880:f158::/48 1 IP source configured
Sources
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