https://github.com/cckuailong/hostscan

不开放到外网的业务，如测试业务原来DNS解析到外网，但是后来删除了A记录（nginx后的业务没删除，转移到了内网访问）

./hostscan -d 127.0.0.1 -i 1.1.1.1./hostscan -D input/hosts.txt -I input/ips.txt -O out/output.txt -T 5 -t 10

./hostscan --help  / )( \ /  \ / ___)(_  _)/ ___) / __) / _\ (  ( \) __ ((  O )\___ \  )(  \___ \( (__ /    \/    /\_)(_/ \__/ (____/ (__) (____/ \___)\_/\_/\_)__)        Usage of ./main:  -D string        Hosts in file to test  -I string        Nginx Ip in file to test  -O string        Output File (default "result.txt")  -T int        Thread for Http connection. (default 3)  -d string        Host to test  -i string        Nginx IP  -t int        Timeout for Http connection. (default 5)  -v    Show hostscan version

https://github.com/fofapro/Hosts_scan

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