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A Python STUN client for getting NAT type and external IP (RFC 3489)

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A Python STUN client for getting NAT type and external IP

This is a fork of pystun originally created by gaohawk (

PyStun follows RFC 3489:

A server following STUN-bis hasn’t been found on internet so RFC3489 is the only implementation.


To install the latest version:

$ pip install pystun

or download/clone the source and install manually using:

$ cd /path/to/pystun/src
$ python install

If you’re hacking on pystun you should use the ‘develop’ command instead:

$ python develop

This will make a link to the sources inside your site-packages directory so that any changes are immediately available for testing.


From command line:

$ pystun
NAT Type: Full Cone
External IP: <your-ip-here>
External Port: 54320

Pass –help for more options:

% pystun --help
usage: pystun [-h] [-d] [-H STUN_HOST] [-P STUN_PORT] [-i SOURCE_IP]
              [-p SOURCE_PORT] [--version]

optional arguments:
  -h, --help            show this help message and exit
  -d, --debug           Enable debug logging (default: False)
                        STUN host to use (default: None)
  -P STUN_PORT, --host-port STUN_PORT
                        STUN host port to use (default: 3478)
  -i SOURCE_IP, --interface SOURCE_IP
                        network interface for client (default:
                        port to listen on for client (default: 54320)
  --version             show program's version number and exit

From Python:

import stun
nat_type, external_ip, external_port = stun.get_ip_info()

This will rotate through an internal list of STUN servers until a response is found. If no response is found you will get “Blocked” as the nat_type and None for external_ip and external_port.

If you prefer to use a specific STUN server:

nat_type, external_ip, external_port = stun.get_ip_info(stun_host='')

If you prefer to use a specific STUN server port:

nat_type, external_ip, external_port = stun.get_ip_info(stun_port=3478)

You may also specify the client interface and port that is used although this is not needed:

sip = "" # interface to listen on (all)
port = 54320 # port to listen on
nat_type, external_ip, external_port = stun.get_ip_info(sip, port)

Read the code for more details…



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