Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
Ip2region is a offline IP location library with accuracy rate of 99.9% and 0.0x millseconds searching performance. DB file is ONLY a few megabytes with all IP address stored. binding for Java,PHP,C,Python,Nodejs,Golang,C#,lua. Binary,B-tree,Memory searching algorithm