$whois 109.207.13.1 ... inetnum: 109.207.0.0 - 109.207.15.255 netname: Electronic-government descr: OJSC Rostelecom descr: Electronic government of the Russian Federation ...
#iptables -A INPUT -s 109.207.13.0/24 -p tcp -j DROP
Source: https://habr.com/ru/post/191546/
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