Note on Server IP: Without making an external call, PHP typically cannot determine the server's *public* IP address if it's behind a router or NAT. `$_SERVER['SERVER_ADDR']` usually provides the server's *internal* (private) IP.
Note on Client IP: `$_SERVER['REMOTE_ADDR']` provides the IP address of the *client* (your browser) accessing this page.
Server's (Internal) IP address: 54.37.202.132
MD5 Hash of Server's IP: 39bdadba9698343f7d15639a583ba72d
Client's IP address: 216.73.216.63
MD5 Hash of Client's IP: b482d2430fe7d795e20f29b837c83bb6
Warning: MD5 is not cryptographically secure for sensitive data.
It's used here only to fulfill the specific request. For security-critical applications, consider SHA-256 or bcrypt.