OSINT port scanner

Features:

    +Zero request from your machine to target
    +Possible to use as much thread as number of IP addresses
    +Threads splits IP addresses between them and scans at the same time
    +Can scan port ranges and single port

Usage:

    For single port:        python3 portscan.py <Subnet> <Thread Number> <Port>
    For multiple ports:     python3 portscan.py <Subnet> <Thread Number> <Starting Port> <End Port>

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