Free Online Proxy Tools
Know a proxy works before your job depends on it: free tools to test proxy lists, see the IP that websites see and check a domain's IPv6 support, with no signup.
ColdProxy's free online proxy tools cover three checks: the Proxy Checker tests each proxy's IPv4 and IPv6 reachability, exit IP and location; the IP Address Checker shows the public IP your connection exposes; and the IPv6 Checker shows, before you buy IPv6 proxies, whether a target site publishes IPv6 addresses. None needs a signup.
Which proxy tool should you use?
Pick by what you have in hand: a proxy list goes into the Proxy Checker, your own connection into the IP Address Checker, and a target domain into the IPv6 Checker.
| Tool | Best for | What you enter | What you get |
|---|---|---|---|
| Proxy Checker | Bulk checking IPv4 and IPv6 reachability, exit IP, and location before production. | One or more proxies, one per line, as HOST:PORT, HOST:PORT:USER:PASS or USER:PASS@HOST:PORT (IP address or hostname) | IPv4 and IPv6 reachability, exit IP, country, region, city, and failure reason |
| IP Address Checker | Checking your public IPv4 and IPv6 address, ISP and location, and confirming that a VPN or proxy hides your IP. | No input required | Live public IPv4 and IPv6, ISP, ASN, city, country, timezone, coordinates, browser, and operating system |
| IPv6 Checker | Checking whether a domain, its mail servers, and its nameservers are IPv6-ready, and whether its DNS points to a recognised CDN. | A domain name or full URL | A, AAAA, MX, and NS lookup results, every IPv6 address found, and a CDN line that reports when public DNS points to one of the selected providers |
Checked your target with the IPv6 Checker? If it publishes IPv6 addresses, deploy with USA Residential IPv6 or Datacenter IPv6 proxies. If it has none but its DNS points to a recognised CDN such as Cloudflare, Fastly, or Akamai, read the IPv6 reachability guide before you choose. If it has neither, use Residential IPv4 proxies instead.
Why use proxy tools?
Proxy tools help you verify that your setup works correctly before running production workflows. Testing early saves time and catches dead proxies, wrong exit locations and missing IPv6 support before they turn into failed requests or bad data. For a step-by-step check, follow the proxy verification guide.
- Verify proxy masking. Confirm that a proxy changes the visible IP address and exits from the expected location before you put it into a scraper, bot, or QA workflow.
- Check geo-targeting. Verify that your connection exits from the correct country and city when a workflow depends on region-specific pricing, ads, or localized content.
- Catch issues before deploy. Spot dead or timed-out proxies, malformed proxy lines, and missing AAAA records before they break a live job, a monitoring run, or an IPv6 rollout.
Frequently asked questions
Proxy tools help you check, troubleshoot and manage proxies and the connections around them. ColdProxy's free proxy tools cover three common checks: the Proxy Checker tests whether proxies work and where they exit, the IP Address Checker shows the IP your connection exposes, and the IPv6 Checker shows whether a site publishes IPv6 addresses.
Start with the IP Address Checker to see what websites currently see when you connect. Then use the Proxy Checker to validate any proxy lists before you run them in production. If you plan to deploy IPv6 proxies, run the IPv6 Checker on your target domain first to see whether it publishes IPv6 addresses or its DNS points to a recognised CDN.
No. All three tools are open to anyone. There is no signup, no login, no credit card, and no email capture. Open the tool, run your test, close the tab.
You can bookmark every tool, and two of them accept a pre-filled check, but no link carries a saved result. The Proxy Checker accepts a proxy via the ?proxy= query parameter and the IPv6 Checker accepts a domain through ?domain=, so opening a shared link runs the check again. For the Proxy Checker that input is the whole proxy line, including any username and password in it.
Yes. All three tools are fully responsive and work in any modern mobile browser, including Chrome for Android and Safari on iOS. The same features available on desktop work on mobile with no reduced functionality.
No. The tools are diagnostics for proxies and domains you provide; they do not give you access to ColdProxy's proxies. To try ColdProxy on your own targets, buy the shortest period: hourly on Residential IPv4 (Unmetered) or Residential IPv6, daily on Datacenter IPv6, or a monthly traffic pack on Residential IPv4 (GB Based). Free trials of the proxies may be available after individual review; ask on Telegram or in a support ticket.
Yes. The IP Address Checker shows your public IPv4 and IPv6 addresses side by side when your network has both. The Proxy Checker works with IPv4 and IPv6 proxy endpoints and reports reachability, exit IP, and location. The IPv6 Checker is purpose-built for IPv6 and returns every AAAA record it finds.
Test ColdProxy proxies with the same checker
Try ColdProxy for as little as an hour, then paste your proxies into the Proxy Checker and see their reachability, exit IP and location for yourself. Residential IPv4 (Unmetered) in 195+ countries and USA Residential IPv6 sell hourly plans, Datacenter IPv6 across 45+ locations starts daily, and Residential IPv4 (GB Based) sells monthly traffic packs. Both IPv6 plans serve targets on IPv6 or a supported CDN. A 99.9% network success rate stands behind every plan, and free trials may be available after individual review.