TCP SYN port scan (Default)
nmap 192.168.1.1 -sS
TCP connect port scan
Default without root privilege
-sT
nmap 192.168.1.1 -sT
UDP port scan
-sU
nmap 192.168.1.1 -sU
TCP ACK port scan
nmap 192.168.1.1 -sA
TCP Window port scan
-sW
nmap 192.168.1.1 -sW
TCP Maimon port scan
-sM
nmap 192.168.1.1 -sM