PortScan

A portscan is a form of network reconnaissance that is often used by attackers as a prelude to an attack.

Type	Description
Portscan Detection	A one-to-one portscan in which an attacker uses one or a few hosts to scan multiple ports on a single target host.
Port Sweep	A one-to-many portsweep in which an attacker uses one or a few hosts to scan a single port on multiple target hosts.
Decoy Portscan	A one-to-one portscan in which the attacker mixes spoofed source IP addresses with the actual scanning IP address.
Distributed Portscan	A many-to-one portscan in which multiple hosts query a single host for open ports.