Test for free USA Residential Proxies

Try before purchase
To get free test
1. go to http://cosmoproxy.com
2. click FREE PROXY TEST button
3. choose USA Residential Service in drop-down menu
Great website to check IP address country https://app.ipapi.co/bulk/

CURL IP command to check IPs that you get on each port in range (Linux)
for i in {START_PORT_NUM..END_PORT_NUM}; do curl -x IP_SERVER:$i ifconfig.co --connect-timeout 60; done
If you looking to test backconnect rotating worldwide residential proxy mix — visit this page
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