Host-Extract – Host/IP Pattern Extractor Tool! This little ruby script tries to extract all IP/Host patterns in page response of a given URL and JavaScript/CSS files of that URL. With -v option, you can ask the tool to output. view-source snippets for each IP/Domain extracted. This will shorten your manual analysis time. The tool may give you false positives when there are some words like – main-site_ver_10.1.1.
Source: https://thehackernews.com/2011/03/host-extract-hostip-pattern-extractor.html