A python script to query and quickly ban whole prefixes for any given autonomous system.

• Lookup the owner of an IP address:

  $ python asnban.py --ip 192.0.2.1
  192.0.2.1 - ASNA - NA
  

• List all the prefixes for an ASN:

  $ python asnban.py --asn 64496
  24.92.187.0/24
  

• List all the prefixes for an ASN and generate iptables -j DROP commands:

  $ python asnban.py --asn 64496 --iptables
  iptables -A INPUT -s 24.92.187.0/24 -j DROP
  

• List all the prefixes for an ASN and generate ufw deny from commands:

  $ python asnban.py --asn 64496 --ufw
  ufw insert 1 deny from 24.92.187.0/24
  

• Combine both steps and generate commands to block all the prefixes of the AS who owns the given IP address:

  $ python asnban.py --ban 192.0.2.1 --iptables
  iptables -A INPUT -s 192.0.2.0/24 -j DROP
  iptables -A INPUT -s 192.0.3.0/24 -j DROP
  [... etc ...]