Freeware: Rdns

NiX - Linux Proxy Checker 1.3.3NIX is a proxy checker that supports HTTPS CONNECT and SOCKS 4, 4a, and 5. It is multi-threaded and supports country detection, protocol auto-detection, and delay information, and has filters based on IP subnet mask, port, and Rdns .

Ping Range 2.0Ping Range is an address scanner. It uses ICMP packets to determine if a device is active on an address and attempts to audit the devices it discovers, for their MAC address and HOSTNAME.