What a proxy list contains
Each entry identifies one proxy server with a hostname or IP address and a port. Private lists may also include proxy authentication credentials. Common formats include:
HOST:PORT
USERNAME:PASSWORD@HOST:PORT
http://USERNAME:PASSWORD@HOST:PORTA list may carry extra fields such as protocol, country, city, provider, last test time and current status. The field order varies between tools, so check the required import format. Treat any list containing credentials as sensitive data.
How software uses a proxy list
A proxy list doesn’t route traffic by itself. Your browser, scraper or proxy manager must load it and choose an endpoint for each connection.
- Parse the host, port and optional credentials.
- Select an endpoint manually, randomly or by location.
- Send the request through that endpoint.
- Record failures and remove unhealthy entries.
If credentials are missing or invalid, an HTTP proxy may return 407 Proxy Authentication Required, while other proxy protocols report authentication failures differently. Connection failures can also mean the endpoint is offline, overloaded or no longer accepting traffic.
Proxy list vs proxy pool
A list is stored endpoint data. A proxy pool is the active system that selects, tests and manages those endpoints.
| Proxy list | Proxy pool | |
|---|---|---|
| Form | File, text or database rows | Managed set of endpoints |
| Selection | Your tool chooses | Pool logic chooses |
| Health data | May become stale | Usually updated during use |
A rotating proxy can hide the pool behind one gateway. You connect to one host and port while the service changes the exit IP, so you don’t need to import every endpoint.
How to check a proxy list
- Test connectivity: confirm that each host and port accepts connections within your timeout.
- Check the observed exit IP: compare it with the expected exit-IP metadata, or confirm that it changes or remains fixed as configured. The gateway endpoint and exit IP may differ.
- Check location and reputation: claimed locations can be wrong, while poor IP reputation can cause blocks or challenges.
- Measure recent results: track latency, successful requests and authentication failures instead of trusting old status labels.
Free public lists often contain unstable, misconfigured or unknown proxies. Their operators can observe connection metadata and any plaintext HTTP traffic. Don’t send passwords, account cookies or private data through an untrusted endpoint. Respect site terms, robots.txt and rate limits regardless of how many proxies are available.
FAQ
Are free proxy lists safe?
Not necessarily. Public proxies may be unreliable or operated by unknown parties, so avoid using them for sensitive traffic or authenticated accounts.
What format does a proxy list use?
It depends on the tool. Common formats are HOST:PORT, USERNAME:PASSWORD@HOST:PORT and a full proxy URL, sometimes followed by location or status fields.
Does a proxy list rotate IP addresses automatically?
No. A list only stores endpoints. Your software or a managed rotating gateway must decide when to switch between them.