How to get Windows Primary and Secondary DNS using Python?

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My Python program needs the following machine information to work:

DNS Primario.
DNS Secundário.

How can I get this information using Python?

python

  • You can use wmi to retrieve this information.

  • How do I get DNS with this wmi?

  • Take a look at the correct answer to this thread: https://stackoverflow.com/questions/4904047/how-can-i-get-the-default-gateway-ip-with-python

  • Buddy, you can’t even find the word DNS in that answer you recommended.

  • @thegrapevine , nor search what query WMI provides to search for DNS?

1 answer

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I don’t know if it’s on the ground windows or linux, but already done using Windows, you can run a ipconfig /all using python and grab all the settings information from your network interface:

import subprocess

ipconfig = subprocess.check_output(["ipconfig", "/all"])

DNS_ip = []


InDns=False

for line in ipconfig.split(b'\n'):
    if b"DNS" in line and b"Servidores" in line:
        DNS_ip.append(line.split(b' : ')[1].strip().decode('UTF-8'))
        InDns=True
    if b":" not in line and InDns:
        InDns=False
        DNS_ip.append(line.strip().decode('UTF-8'))



print(DNS_ip)

The above example returns my primary and secondary DNS servers:

C:\Python33>python.exe achaDNS.py
['8.8.8.8.', '4.4.4.4']

Run in Windows10 PT-BR if Win is in English it is very likely that you will have to exchange the IF "Servers" for "Server", I am using Python version 33, if it is on Linux or MAC it will not work ...

  • Dear Ederwander, your code looks really good, I just don’t understand why you did it b' : ' instead of ' : ' (the same goes for b"DNS" and b"Servidores"), there are no characters to escape from, agree that it is redundancy? I know that it does not affect anything, but it also does not seem to be necessary. Rest for Windows Server (or even desktop) in Portuguese this very good.

  • the b is necessary because when you perform ipconfig = subprocess.check_output(["ipconfig", "/all"])the return produces an instance for the byte type, so I’m comparing the strings using the same type, notice that at the end I convert the string to utf8 using a decode('UTF-8')

  • You’re absolutely right dear It was my mistake!

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