[CyberNinja]

hakoriginfinder :Tool to discover the origin host behind a reverse proxy. Useful for bypassing WAF and other reverse proxy servers.

How does it work?
This tool will first make a HTTP request to the hostname/URL that you provide and store the response, then it will make a request to every IP address that you provide via HTTP (80) and HTTPS (443) by default (more ports can be given via option), with the Host header set to the original host(:port). Each response is then compared to the original using the Levenshtein algorithm to determine similarity. If the response is similar, it will be deemed a match.

https://github.com/hakluke/hakoriginfinder

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[Godblessed]

there is no need to scan an entire IP range. This is noisy and takes a lot of time, instead you can check already available databases like shodan and others for doing this.