https://nmap.org/
公司實驗室的機器 IP有時候飄來飄去，這時候就可以靠 nmap來找到需要的機器。
掃描指定機器的常用埠
nmap 192.168.1.10
Starting Nmap 7.95 ( https://nmap.org ) at 2026-07-14 17:52 CST
Nmap scan report for renegade-ThinkPad-L13 (192.168.1.10)
Host is up (0.000069s latency).
Not shown: 998 closed tcp ports (conn-refused)
PORT STATE SERVICE
22/tcp open ssh
3389/tcp open ms-wbt-server
Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds
掃描子網路 (192.168.1.0 to 192.168.1.255)
nmap 192.168.1.0/24
掃描指定的埠
nmap -p 22 192.168.1.10
Starting Nmap 7.95 ( https://nmap.org ) at 2026-07-14 17:53 CST
Nmap scan report for renegade-ThinkPad-L13 (192.168.1.10)
Host is up (0.000052s latency).
PORT STATE SERVICE
22/tcp open ssh
Nmap done: 1 IP address (1 host up) scanned in 0.03 seconds
偵測每個埠上運行的服務
nmap -sV 192.168.1.10
Nmap scan report for renegade-ThinkPad-L13 (192.168.1.10)
Host is up (0.000069s latency).
Not shown: 998 closed tcp ports (conn-refused)
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 10.0p2 Ubuntu 5ubuntu5.4 (Ubuntu Linux; protocol 2.0)
3389/tcp open ms-wbt-server Microsoft Terminal Service
Service Info: OSs: Linux, Windows; CPE: cpe:/o:linux:linux_kernel, cpe:/o:microsoft:windows
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 11.24 seconds
掃描子網路下所有 port 22的狀態為 open的機器
nmap -p 22 -T4 --open -oG - 192.168.1.10
# Nmap 7.95 scan initiated Tue Jul 14 18:16:59 2026 as: nmap -p 22 -T4 -oG - 192.168.1.0/24
Host: 172.31.97.112 (renegade-ThinkPad-L13) Status: Up
Host: 172.31.97.112 (renegade-ThinkPad-L13) Ports: 22/open/tcp//ssh///
# Nmap done at Tue Jul 14 18:16:59 2026 -- 1 IP address (1 host up) scanned in 0.03 seconds
- -T4 加速掃描速度
- --open 只列出狀態為 open的 port
- --oG - 輸出grepable的格式到console
