Get IP from specific URL in Spring Boot App

At least you need to extract domain name or base url from the request. Then, use that domain name to get the IP Address via Java's InetAddress class.

Code :

@RequestMapping("/extract")
public void extract(HttpServletRequest request) throws MalformedURLException {
    String domainName = ServletUriComponentsBuilder.fromRequestUri(request)
        .replacePath(null)
        .build()
        .toUriString();
    InetAddress ip = InetAddress.getByName(new URL(domainName).getHost());
    System.out.println(ip);
}