How many IPs can I whitelist?

It depends on the provider. CleanProxies ISP and ISP subnet proxies accept 1 to 20 IPv4 addresses.

Why did my whitelisted proxy stop working?

Your public IP has most likely changed, for example after a router restart, on a VPN or on a different network. Check your current IP and update the list.

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What Is IP Whitelisting for Proxies?

IP whitelisting, also called IP allowlisting, is a way to authenticate to a proxy by the address you connect from. You register your public IP with the provider, and the proxy accepts connections from that address without a username or password.

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how it works

How IP whitelisting works

Every TCP connection carries the IP address of the machine that opened it. When a connection reaches a whitelisted proxy, the proxy compares that source address with the list on your account. A match is let through; anything else is refused or answered with 407 Proxy Authentication Required. The proxy URL then needs no credentials: http://HOST:PORT.

The address that counts is your public IPv4 address as the proxy sees it, not the private address of your laptop such as 192.168.1.20. Behind a home router, an office firewall or a cloud NAT gateway, that is the router's or gateway's address. Check it with what is my IP from the same machine and network that will use the proxy, and register the IPv4 address rather than an IPv6 one.

1
Secret in your code or config
IP whitelisting
None
Username:password
Credentials in every proxy URL
2
Works from a new machine
IP whitelisting
Only after you add its IP
Username:password
Yes, straight away
3
Tools without proxy login fields
IP whitelisting
Works
Username:password
May not work
4
Dynamic home IP or CGNAT
IP whitelisting
Breaks, or is shared with other subscribers
Username:password
Unaffected

why it matters

Why IP whitelisting matters for proxy users

Whitelisting suits fixed servers and tools that cannot send a Proxy-Authorization header, such as some browser launch flags and desktop apps. It is a poor fit for laptops that move between networks.

CleanProxies supports IP whitelisting of 1 to 20 IPv4 addresses on static ISP proxies and ISP subnet proxies; rotating residential and mobile proxies use username:password.

IP whitelisting: what it means for you

If your ISP uses CGNAT, your public IP is shared with other subscribers, so whitelisting it would let them use your proxies too. Use credentials instead.
Serverless functions and autoscaling servers often leave through changing addresses; give them a fixed outbound IP or use credentials.
When a working setup suddenly returns 407, check whether your public IP changed before anything else.

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Dedicated IPs on US carrier ASNs with unlimited bandwidth and threads, never shared.

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Dedicated static IPs registered to US and Canadian ISPs. The address stays the same for as long as you hold it, with unlimited bandwidth and HTTP(S) or SOCKS5 access.

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