http://mnaxv2amcoysm63cdjtjmfown65muwicvle4n3cxjxp6azsyphe4k5ad.onion
IP Checker can be used to discover open TCP ports vulnerable for attack, or check if an IP is online/offline by sending a "ping" query, this can give useful information, like how effective our attacks are against a target, or what ports we need to attack.