IP to AS routing data query script
Python client for IP to ASN lookup services
aslookup is a client utility for two of the public IP/AS query services operated by the following organizations:
- Shadowserver -- https://www.shadowserver.org/wiki/pmwiki.php/Services/IP-BGP
- Team Cymru -- http://www.team-cymru.org/IP-ASN-mapping.html
The client implements both a simple Python module (aslookup) as well as a CLI
as-lookup). The lookups are currently done using DNS, which works
well for a one-off lookups. It is not optimized for bulk lookups over the
Currently only IPv4 addresses are looked up. The client also maintains a listing of IP networks which are unroutable internet addresses, typically special use ranges in RFCs. In this way it can both filter out addresses from queries which are a waste of time, as well as provide context to the user on the address.
The app has been tested on Python 3. The script requires the dnspython package. If missing, it will be installed automatically.
It's best to install the program into a Python virtualenv.
Recommended installation from PyPI using pip (make sure to use the pip or python command from your target Python 3 environment)!
pip3 install aslookup
The Python module defaults to querying the Shadowserver data service. The
desired service may be specified by passing the service parameter to
from aslookup import get_as_data ip = '220.127.116.11' get_as_data(ip, service='cymru')
It is possible to provide multiple IP addresses as arguments to the script, or to send them as a list on standard input, in which cases the script loops over them and returns output on separate lines. When providing invalid IPv4 addresses as arguments, the script reports the problem on standard error and exits with an error. When providing input on stdin, the error is reported on standard output but execution is not aborted.
as-lookup 18.104.22.168 22.214.171.124
A list of test values for the script is included in the file
This can be useful to validate included IP prefix classifications and see the
as-lookup < test_input.txt
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
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