nmap -A 启用操作系统和版本检测，脚本扫描和路由跟踪功能

 nmap -A xx.xx.IP.xx
Starting Nmap 7.91 ( https://nmap.org ) at 2021-08-18 10:13 CST
Nmap scan report for 39.108.15.161
Host is up (0.075s latency).
Not shown: 989 filtered ports
PORT     STATE  SERVICE        VERSION
22/tcp   open   ssh            OpenSSH 8.0 (protocol 2.0)
| ssh-hostkey: 
|   3072 aa:1f:34:3d:c5:30:7c:36:f3:e6:ba:70:1f:01:a5:04 (RSA)
|   256 de:66:79:0f:ff:1a:a9:64:d7:a9:c2:b7:d4:1e:56:8a (ECDSA)
|_  256 fd:3b:a3:b4:fe:fb:33:a7:a4:cd:dc:aa:30:3e:57:d2 (ED25519)
80/tcp   open   http           nginx
|_http-title: 403 Forbidden
443/tcp  open   ssl/http       nginx
|_http-title: 403 Forbidden
| ssl-cert: Subject: commonName=api.weboss.hk  # 将证书信息都给你了，还是不错的！！！
| Subject Alternative Name: DNS:api.weboss.hk
| Not valid before: 2019-10-25T00:00:00
|_Not valid after:  2020-10-24T12:00:00
|_ssl-date: TLS randomness does not represent time
| tls-alpn: 
|   h2
|_  http/1.1
| tls-nextprotoneg: 
|   h2
|_  http/1.1
888/tcp  open   http           nginx
|_http-title: 403 Forbidden
4000/tcp closed remoteanything
4001/tcp closed newoak
4002/tcp closed mlchat-proxy
4003/tcp closed pxc-splr-ft
4004/tcp closed pxc-roid
4005/tcp closed pxc-pin
4006/tcp closed pxc-spvr