Developers of bots or scraping tools often use "randomized" lists of these proxies to bypass rate limits or geo-blocks. Contents: A list of proxy endpoints and ports. Analysis Steps

If it looks like user@email.com:password123 , it is a .

If it looks like 192.168.x.x or domain.com , it is a .

These are often used for credential stuffing attacks . Malicious actors take leaked email/password combinations and test them against the IPVanish login page to see which accounts are active.

Are you trying to or performing a security audit ?

Power users or developers often create these to "randomize" their connection. Instead of connecting to the same server every time, a script reads from this text file to pick a random entry.