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IP Block Lists Aggregator

A Python tool that downloads IP block lists from various sources and builds configurations for network equipments and firewalls.


Installation using pip:

$ pip install blocklistsaggregator

Editable Installation using your GitHub forked repository and virtualenv:

$ mkdir blocklistsaggregator
$ cd blocklistsaggregator
$ virtualenv venv
$ source venv/bin/activate
$ pip install -e git+


It's a command line tool, the --help is your friend! Some examples are worth a thousand words.

  • Download and display entries from all the configured block lists:

  • Only from Ransomware Tracker RW_IPBL and DROP:

    $ --lists rw_ipbl drop
  • Download entries from all the configured lists and save them in JSON format into all.json:

    $ -f json -o all.json
  • Read the previously saved entries from all.json and display them in a Cisco IOS prefix-list style:

    $ -i all.json -f cisco-ios
  • From the previously saved entries, filter out those falling in and those with a prefix-len shorter than /24 and save them into cisco.acl in a Cisco ACL style with name BADGUYS:

    $ -i all.json --exclude --exclude-ipv4-shorter-than 24 -o cisco.acl -f cisco-ios --cisco-cfg-element acl_source --cisco-cfg-element-name BADGUYS
  • Prepare an ip route <network> <mask> null0 command for each IPv4 entry in DROP:

    $ --lists drop -4 --lines-format "ip route {network} {netmask} null0"
  • Download standard block lists and output them in a Mikrotik address-list format into addMalwareIPs.rsc; save lists into /tmp and, in case of failure during one of the next executions, reuse them to build the output:

    $ blocklistsaggregator --output addMalwareIPs.rsc --output-format mikrotik --mikrotik-address-list-name addressListMalware --lists-storage-dir /tmp/ --recover-from-file


Error logging and reporting can be configured in order to have feedback about BlockListsAggregator's activity. The --logging-config-file option can be set to the path of a configuration file in Python's logging.fileConfig() format. An example is provided within the distrib/log.ini file (here the file hosted on GitHub).

Source block lists

The following block lists are currenly implemented:

Warning for RW_DOMBL and RW_URLBL: the program extracts the domain names reported into these lists to resolve the IP addresses and uses them for the output. This may result in an overblocking behaviour because these filters should be applied with a more granular level than layer-3 addresses. These lists are not used by default unless explicitly given via the command line --lists or --lists-include arguments.

A list of block-lists can be found on

Output options

The following output formats are currenly implemented:

  • JSON
  • lines (with macros)
  • Cisco IOS prefix-list
  • Cisco IOS ACL (source-based, destination-based, permit/deny actions)
  • Mikrotik RouterOS address-list


This tool is currently in beta: some field tests have been done but it needs to be tested deeply and on more scenarios.

Moreover, contributions (fixes to code and to grammatical errors, typos, new features) are very much appreciated.

Bug? Issues?

But also suggestions? New ideas?

Please create an issue on GitHub at


Pier Carlo Chiodi -

Blog: Twitter: @pierky


A Python tool that downloads IP block lists from various sources and builds configurations for network equipments and firewalls.








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