1. 前言
   工作中有时要查询域名解析和获取域名相关IP归属地信息
2. 安装依赖
   python2:
   pip install dnspython
   python3:
   python3 -m pip install -i https://pypi.douban.com/simple/ dnspython3
3. 脚本内容
   #!/usr/bin/env python#coding:utf-8 import dns.resolverimport urllibimport chardetimport sysimport re ip_list = []query_domain = sys.argv[1]#query_domain = raw_input('Please input a domain: ') # 先查询是否有CNAME，如果有则通过CNAME获取到A记录；如果没有直接获取A记录，然后返回到一个列表中def get_iplist(domain):    try:        cn = dns.resolver.query(domain,'CNAME')        for i in cn.response.answer:            for j in i.items:                cname_domain = j.to_text()         print '========================================'        print '    CNAME  --->', cname_domain        print '========================================'    except:        pass    else:        A = dns.resolver.query(cname_domain,'A')        for i in A.response.answer:            for j in i.items:                try:                    ip_list.append(j.address)                except:                    get_iplist(str(j))             try:        A = dns.resolver.query(domain,'A')        for i in A.response.answer:            for j in i.items:                ip_list.append(j.address)    except:        pass    return ip_list # 通过调用ip138.com来获取IP归属地信息def get_ipbelong(domain_ip):    url = 'http://ip138.com/ips138.asp?ip=%s&action=2' % domain_ip    content = urllib.urlopen(url).read()    typeEncode = sys.getfilesystemencoding()    infoencode = chardet.detect(content).get('encoding','utf-8')    html = content.decode(infoencode,'ignore').encode(typeEncode)    ip = re.findall(r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}',html)    result = re.findall(r'(
   .*?
   )',html)    belong = result[0][14:-5]    print '%-*s--->%*s' % (18,ip[0],20,belong)  if __name__ == '__main__':    get_iplist(query_domain)    for ip in ip_list:        get_ipbelong(ip)
4. 使用
   python domain2ip.py www.baidu.com