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nmap -p- -Pn -n 172.28.128.3

-p-: you can specify -p- to scan ports from 1 through 65535.

-Pn: Treat all hosts as online — skip host discovery

-n/-R: Never do DNS resolution/Always resolve [default: sometimes]

 

nmap -sV -T4 -p-65535 172.28.128.3

Adding the -sV option enables Nmap version detection, which is trained to look for these clues (among others).

-T4 prohibits the dynamic scan delay from exceeding 10 ms for TCP ports and -T5 caps that value at 5 ms.

-p-65535: scan all ports to 65535

Reference to values for T: T Table

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