nc扫描端口

nc可以用来扫描端口，但是各个系统之间版本差别较大

centos7：

nc 不支持-r，i.e. 无法扫描端口范围。如果只测试一个端口可以用nc

[root@baidu ~]# nc -4vzw 1 www.baidu.com 81 Ncat: Version 7.50 ( https://nmap.org/ncat ) Ncat: Connection to 39.156.66.18 failed: Connection timed out. Ncat: Trying next address... Ncat: Connection timed out. [root@baidu ~]# nc -4vzw 1 www.baidu.com 80 Ncat: Version 7.50 ( https://nmap.org/ncat ) Ncat: Connected to 39.156.66.18:80. Ncat: 0 bytes sent, 0 bytes received in 0.03 seconds.

范围扫描可以用nmap

yum install nmap -y [root@baidu ~]# nmap -sS -p 79-81 www.baidu.com Starting Nmap 6.40 ( http://nmap.org ) at Nmap scan report for www.baidu.com (39.156.66.14) Host is up (0.0073s latency). Other addresses for www.baidu.com (not scanned): 39.156.66.18 PORT STATE SERVICE 79/tcp filtered finger 80/tcp open http 81/tcp filtered hosts2-ns Nmap done: 1 IP address (1 host up) scanned in 1.32 seconds

mac:

nc 支持-r，但是超时不用-w，这个nc忘了是不是系统自带的了，版本号都没查到

root@baidu ~ % nc -rvz -i 1 -G 1 39.156.66.18 79-81 Connection to 39.156.66.18 port 80 [tcp/http] succeeded! nc: connectx to 39.156.66.18 port 81 (tcp) failed: Operation timed out nc: connectx to 39.156.66.18 port 79 (tcp) failed: Operation timed out

百度承受了很多测试的责任，能力越大责任越大啊，哈哈蛤

其他的系统暂时未尝试，大家如果有好的方法欢迎留言