Python socket.gethostbyaddr(ip)

Question

试图从IP和主机名列表中获取主机名--当它解析IP地址时，我没有得到想要的返回，它仍然只是返回一个IP。

示例: 192.10.20.1输出:查找主机名192.10.20.1，而不是将其转换为主机名。

def reverse_dns(IP):
    try:
        socket.gethostbyaddr(IP)
        print ('Found hostname', IP)
        return (True)
    except socket.error :
        print (IP)
        return (False)

def get_hostname (x) :
    hostname= []

    device = 'is blank'
    for device in x : 
        if reverse_dns(device) :
            hostname.append(device)
    return (hostname)

df['hostname'] = df['ips'].apply(get_hostname)

Answer 1

您需要返回gethostbyaddr()返回的主机名。然后

def reverse_dns(IP):
    try:
        hostname, aliaslist, ipaddrlist = socket.gethostbyaddr(IP)
        print ('Found hostname', IP)
        return hostname
    except socket.error :
        print (IP)
        return (False)

def get_hostname (x) :
    hostname= []

    for device in x : 
        hostname.append(reverse_dns(device) or 'is blank')
    return (hostname)

df['ips'] = df['hostname'].apply(get_hostname)