> $ sudo nmap -v -p 8000 192.168.5.20                                                                                              
Place your finger on the fingerprint reader
Starting Nmap 7.94 ( https://nmap.org ) at 2024-04-04 11:42 +08
Initiating Ping Scan at 11:42
Scanning 192.168.5.20 [4 ports]
Completed Ping Scan at 11:42, 0.19s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 11:42
Completed Parallel DNS resolution of 1 host. at 11:42, 0.00s elapsed
Initiating SYN Stealth Scan at 11:42
Scanning dover-livingroom-cam1.guillaumea.fr (192.168.5.20) [1 port]
Completed SYN Stealth Scan at 11:42, 0.01s elapsed (1 total ports)
Nmap scan report for dover-livingroom-cam1.guillaumea.fr (192.168.5.20)
Host is up (0.086s latency).

PORT     STATE  SERVICE
8000/tcp closed http-alt

> $ sudo nmap -v -p 8000 192.168.5.20                                                                                                                                                                                                        
Starting Nmap 7.94 ( https://nmap.org ) at 2024-04-04 18:21 +08
Initiating Ping Scan at 18:21
Scanning 192.168.5.20 [4 ports]
Completed Ping Scan at 18:21, 0.29s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 18:21
Completed Parallel DNS resolution of 1 host. at 18:21, 0.00s elapsed
Initiating SYN Stealth Scan at 18:21
Scanning dover-livingroom-cam1.guillaumea.fr (192.168.5.20) [1 port]
Discovered open port 8000/tcp on 192.168.5.20
Completed SYN Stealth Scan at 18:21, 0.01s elapsed (1 total ports)
Nmap scan report for dover-livingroom-cam1.guillaumea.fr (192.168.5.20)
Host is up (0.25s latency).

PORT     STATE SERVICE
8000/tcp open  http-alt

Read data files from: /usr/bin/../share/nmap
Nmap done: 1 IP address (1 host up) scanned in 0.39 seconds
           Raw packets sent: 5 (196B) | Rcvd: 2 (84B)