pig is a python based dig which is a famous dns check tool created by isc.org .
usage:
1.query A record pig www.baidu.com or pig www.baidu.com @119.29.29.29
2.query NS record pig baidu.com ns or pig baidu.com @119.29.29.29 ns
3.query CNAME record pig www.163.com cname or pig www.163.com @8.8.8.8 cname