scanner
Filterbit - OPSWAT Metascan Demo
http://www.filterbit.com/
Online malware scan
http://virusscan.jotti.org/
Virus.Org :: Malware Scanning Service
http://scanner.virus.org/
VIRUSTOTAL - Free Online Virus and Malware Scan
https://www.virustotal.com/
VirusTotal is a free virus and malware online scan service
knock - subdomain scan
http://knock.gianniamato.it/
Angry IP scanner - program for analyzing networks
https://angryip.org/
Very fast and small ip scanner, port scanner, and network scanner in one, helpful for analyzing networks and scanning ports
SoftPerfect Network Scanner: fast and free network scanner
http://www.softperfect.com/products/networkscanner
Fast multi-threaded IPv4/IPv6 scanner with an extensive range of options and advanced features for system administrators and general users.