With the help of a couple of prefix aggregation tools [1] [2], the BASH shell, and the RIPE database, it is straightforward to block any Autonomous System with,

With the help of a couple of prefix aggregation tools [1] [2], the BASH shell, and the RIPE database, it is straightforward to block any Autonomous System with, e.g: $ ASN=32934; for IP in 4 6; do \ whois -h riswhois.ripe.net \!${IP/4/g}as${ASN} |\ sed -n '2 p' | tr \ \\n | aggregate${IP/4/} |\ while read NET; do echo ip${IP/4/}tables -I OUTPUT -d ${NET} -j REJECT;\ done; done (note this command uses echo to show the command it could execute) [1] aggregate http://packages.ubuntu.com/source/xenial/aggregate http://packages.ubuntu.com/source/xenial/aggregate [2] aggregate6 https://github.com/job/aggregate6 https://github.com/job/aggregate6