Converting an IP Address string to exactly 4 bytes in Python

Question

So this is very simple, but I'm having trouble getting this to work. I want to, for example, if the incoming IP address string is '168.108.114.22', convert this to a bytes object like:

\xA8\x6C\x72\x16

Basically each part of the IP address is converted to it's hexadecimal equivalent.

I've tried so many ways but couldn't get what I want. String manipulation, using socket.inet_aton, packing, etc. I want to be able to send these bytes over a socket and then receive and parse them at the other end, but I am having trouble just getting my bytes object created and looking like that.

Martin Evans · Accepted Answer · 2015-10-21 05:49:47Z

4

Python's inet_aton function should do what you need, it does return a string containing exactly 4 bytes:

import socket

print socket.inet_aton('168.108.114.22')
print socket.inet_aton('65.66.67.68')

These would display:

¨lr
ABCD

And to convert the four characters back again using inet_ntoa:

print socket.inet_ntoa('\xA8\x6C\x72\x16')
print socket.inet_ntoa('ABCD')

Giving:

65.66.67.68

edited Oct 21, 2015 at 5:49

answered Oct 20, 2015 at 21:21

Martin Evans

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2 Comments

user2055216 Over a year ago

How would I convert this back to the IP address on the other end of the socket? If I sent it through this way, after converting using inet_aton.

Pynchia Over a year ago

ntoa i.e. network-to-ascii (they all come from good ol' C)

Pynchia · Accepted Answer · 2015-10-20 21:24:12Z

1

this

ip='168.108.114.22'

b_out = bytes(map(int,ip.split('.')))
print(b_out)

on python 3 produces

b'\xa8lr\x16'

which should be what you are looking for, if I understand correctly.

Note: there are more specific and optimized utility functions to manipulate IP addresses

edited Oct 20, 2015 at 21:24

answered Oct 20, 2015 at 21:01

Pynchia

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