Proxy authentication: username and password or IP whitelist?

Use a username and password unless you have a reason not to: it works from any network, from any number of machines, and on most providers the username is also where you pick a country or keep a session. Whitelist your IP instead when the software cannot send a proxy password (Chrome with a SOCKS proxy, for one) and your connection has a fixed public address of its own. Whitelisting lets in everything that leaves from that address, so never whitelist an address you share with other people. Neither method encrypts your traffic.

Answer · The live comparison uses prices checked up to Oct 24, 2026; every figure in the text keeps the date it was checked.

How each one works

Username and password. For an HTTP proxy, the proxy answers a request that carries no login with status 407, “Proxy Authentication Required”, and your software sends the request again with the username and password in a Proxy-Authorization header (RFC 9110, section 11.7). Most tools do this for you once you put the login in the proxy address, as in http://user:pass@host:port. For a SOCKS5 proxy, the login is a short exchange at the start of each connection (RFC 1929).

IP whitelist (allowlist). You give the provider the public IP address your requests leave from, and its servers let in every connection from that address without asking for a login. Nothing is sent with the request; the address is the login.

What each one is good and bad at

A home connection’s public address usually changes from time to time, and many mobile and some home providers put lots of customers behind one shared public address (carrier-grade NAT, Wikipedia). Whitelisting such an address breaks when it changes and, while it lasts, opens your plan to strangers on the same address. A cloud server with an address assigned to it, or an office line with a fixed one, is what whitelisting suits.

You do not always have to choose. Some providers let you require both, so a request needs the login and must also come from an address on your list: Bright Data’s allowlist sets the addresses “permitted accessing your zone” on top of the zone’s own login (Bright Data docs). A leaked password then works nowhere else.

The login is not encryption

The standard HTTP login, “Basic”, sends the username and password encoded, not encrypted; its own standard calls it “not a secure method of user authentication” (RFC 7617, section 4). The SOCKS5 login sends the password in clear text too (RFC 1929). That stays true when the site you visit uses HTTPS: the page is encrypted end to end, but the login goes to the proxy first, outside that encryption, unless your connection to the proxy is itself encrypted. Treat a proxy password as one that can be seen on the network between you and the provider: give it its own password, used nowhere else, and change it if it shows up in a shared file.

What it does to the price

Nothing directly: providers do not charge for one method over the other. Where it costs money is the limits. Some plans state how many addresses you may whitelist or how many separate logins (sub-users) you get, and the number grows with the plan, as the box above shows. A team that needs a login per person, or a fleet of servers that each need whitelisting, can be pushed into a bigger plan than its traffic needs. Check that number before you compare prices; the residential comparison ranks plans by what they cost at your amount.

Setting it up

• In code and command-line tools: put the login in the proxy address (http://user:pass@host:port, or socks5h://user:pass@host:port), and keep it out of the script itself, in an environment variable.
• In a browser: Chrome and Firefox ask for the login when an HTTP proxy demands one. For a SOCKS proxy in Chrome, whitelist your IP or use the provider’s HTTP address (Chromium proxy documentation).
• Whitelisting: look up your public address from the machine that will use the proxy, add that address in the provider’s dashboard, and remove it when the machine goes.

SOCKS4 vs SOCKS5 explains why the SOCKS version decides whether a password is possible at all.