子域名在线扫描 -- dnsdumpster

https://dnsdumpster.com/

Starting Nmap 7.40 ( https://nmap.org ) at 2022-01-23 01:34 UTC
Nmap scan report for mx210.baidu.com (123.125.66.210)
Host is up.
PORT     STATE    SERVICE
21/tcp   filtered ftp
22/tcp   filtered ssh
23/tcp   filtered telnet
80/tcp   filtered http
110/tcp  filtered pop3
143/tcp  filtered imap
443/tcp  filtered https
3389/tcp filtered ms-wbt-server
Nmap done: 1 IP address (1 host up) scanned in 3.83 seconds