Localtonet tools

SOCKS5 UDP tester

Check a SOCKS5 proxy for connectivity and working UDP relay.

Your SOCKS5 proxies

One per line. Check up to 50 at a time.

0 / 50

Proxy address or list

All entries are tested as SOCKS5. See input formats.

Options Login, import

Username (optional)

Password (optional)

Shared login is added to plain host:port entries. Entries with their own login keep it.

Import a plain text list from a URL

Import replaces the list above. Public HTTP and HTTPS URLs on ports 80 or 443 only.

Checks run from Localtonet’s server. Use a publicly reachable proxy address.

Input formats & help

Getting started

How to check a proxy

For a single check, paste one address. For a bulk check, put each proxy on its own line. Login can be included in the address or added under Options.

Local addresses such as 127.0.0.1 and private network IPs cannot be checked by this public tool. Use the external address supplied by your proxy provider.

Accepted formats

Address: host:port
Address with login: host:port:user:password
Login before address: user:password@host:port
Explicit protocol: socks5://user:password@host:port
IPv6 address: [2001:db8::1]:1080

Formats are examples, not working proxies. Use percent encoding for special characters in URL credentials.

Understand your results

Read your results

What the check tells you

Online, offline or not checked

Online confirms a successful connection. Offline, timed out, invalid and not checked have different causes. Read the result’s reason before changing your proxy settings.

UDP confirmation

“UDP confirmed” means the SOCKS5 relay returned a response. “Relay accepted” means it accepted UDP ASSOCIATE, but a round trip was not confirmed. These are different results.

IP, location & response time

Exit IP is the address seen through the proxy. A proxy-host location is labeled separately. Response time comes from the Localtonet server and may differ from your device.

Why can TCP work while UDP fails?

SOCKS5 handles TCP and UDP separately. A proxy may accept TCP connections while UDP is disabled, filtered, or unable to return a response. Expand a result to see the relay and test log.

What is included in the download?

The text file includes the working entries in your current result filter, using the addresses and any login you submitted. Keep that file private if your proxies require credentials.