Trying to ban a user but they still keep getting in via a proxy? Welp here is a list you can try entering in your ban list.

dnai-216-15-34-70.cust.dnai.com:80
barto.blinncol.edu:8080
64.132.101.201:8080
216.125.41.2:80
207.2.54.2:80
machinetransport.com:80
157.91.107.42:8080
12.34.48.126:80
12.34.48.129:8080
206.8.102.102:80
216.102.13.21:80
64.132.101.212:8080
proxy.ia2.marketscore.com:80
216.101.117.161:8000
63.238.139.7:80
64-93-37-226.client.dsl.net:80
216.167.107.64:8080
cmas-tj.cablemas.com:8080
207.225.81.150:80
12.34.48.129:80
webmail.mail-ahoy.com:8000
64.166.74.5:8080
66.64.3.154:80
206.58.182.99:80
216-210-163-62.atgi.net:8080
208.144.37.7:80
12.34.48.126:8080
wsip68-15-137-132.hr.hr.cox.net:80
ensait19.ensait.fr:80
ipd50a24c0.speed.planet.nl:3128
proxy.hs-bremerhaven.de:8080
ot0-69.biwa.ne.jp:80
mailgate.gerrardcars.co.uk:3128
168.11.49.5:8080
148.74.255.104:80
AS7000_1B.sfn.co.jp:8080
ns.dainichi-el.co.jp:80
209.3.144.105:8080
ado.com.mx:80
210.145.17.38:8080
207.35.39.100:80
200.23.209.209:8080
200.34.247.181:80
204.60.171.225:80
206.13.80.4:80
ns.mmko.co.jp:8080
216.112.227.130:8080
www.stdavid.org:8080
63.167.108.38:8080
volun.center-mie.or.jp:80
trojan.gjsd.k12.pa.us:80
amuro.kcg.co.jp:80
200.23.209.209:80
nt-server.trsinc.org:80
64.109.68.66:3128
filter1.sctelcom.net:80
port20.net106.bignet.net:80
206.228.51.3:80
206.105.71.2:80
213.254.184.211:80
2.monfoyer.co.jp:80
host104-139.urbana.edu:80
mail.otsg.com:80
209.3.144.105:80
marvin.cc.fer.hr:80
north.fujicolor-hokuyo.co.jp:8080
mh.sci-tennis.net:80
www.kan-shoku.co.jp:80
64-204-113-98.client.dsl.net:8080
209.11.25.1:80
207.232.162.139:80
207.62.41.10:80
pc2.setoimanamoihcim-unet.ocn.ne.jp:80
cache1.qsi.net.nz:80
193.164.99.165:80
211.76.98.230:8080
wall.nisso-x.co.jp:80
204.184.137.1:80
216.235.32.126:80
tt.tech-t.co.jp:80
216-55-142-30.dsl.san-diego.abac.net:3128
ns.cyberlinks-jp.com:80
202.85.177.223:80
melcache01.powertel.net.au:80
200.75.211.35:80
204.185.138.59:80
mail.sd242.k12.id.us:80
211.15.62.123:8000
209.152.98.155:80
207.225.63.2:8080
209.88.144.24:8080
148.206.101.5:80
2.magicbird.co.jp:80
cm61-10-4-130.hkcable.com.hk:80
210.145.17.38:8180
208.9.78.77:80
202.81.246.7:80
210.145.17.38:8280
194.78.144.179:8080
210.166.174.123:80
node18673.a2000.nl:3128
202.85.153.194:8080
211.17.150.163:80
63.162.212.2:80
195.53.49.197:80
193.5.163.239:8080
210.163.167.162:80
64.3.183.163:8080
193.164.99.105:80
200.23.182.26:80
cncldns1srv.council.net:80
64.5.220.82:80
216.208.168.2:80
209.187.235.30:80
home.fr.clara.net:8080
212.147.107.28:8080
202.39.225.81:8080
202.106.169.20:80
sv.jtcam.co.jp:80
204.196.104.27:80
www.jcn.co.jp:80
194.209.157.111:80
194.106.137.20:80
www.desoto.k12.la.us:80
200.38.161.34:80
207.232.181.253:8080
208.233.33.11:80
195.53.255.242:80
eclipse-1.richmond.k12.nc.us:80
servidor1.eternit.com.co:80
210.239.155.132:8080
193.52.220.2:80
195.171.209.195:8080
www.n-highschool.net:80
212.80.166.163:80
217-5-32-212.winkwll.ll.ftech.net:80
195.94.201.158:80
203.102.215.227:80
dns1.koibuchi.ac.jp:80
silainiai.failanas.lt:8080
193.15.176.34:8000
194.79.171.67:80
dns.lpgc.or.jp:80
212.97.164.130:8080
195.243.124.114:80
210.255.168.50:80
dns1.sgrl.org:80
adsl-63-194-179-202.dsl.snfc21.pacbell.net:80
195.223.151.7:80
ftp.orange.uk.com:8000
heidpark.be:80
mail.komvux.partille.se:80
kitaro.webserve.ne.jp:80
213.8.66.227:80
196.40.22.179:80
209.227.71.72:80
195.68.114.2:8080
proxy.ozemail.com.au:8080
mail.allanboyle.co.nz:80
62.159.159.114:8080
200.41.234.241:80
dns2.mdsnet.it:80
203.151.40.4:80
163.29.26.60:8080
mail.ism-sa.fr:8080
211.20.195.43:3128
212.143.137.12:80
61.137.78.78:80
217.59.205.26:3128
203.53.209.66:80
mail.kantor.gr:80
202.138.200.18:80
211.20.195.43:80
218.44.151.218:80
193.95.25.22:80
203.41.81.65:80
195.3.110.122:80
proxy.bashedu.ru:8080
202.190.118.20:8080
internet-server.ebf.com.br:80
200.195.52.193:80
194.78.16.73:8000
200-168-28-78.dsl.telesp.net.br:6588
203.185.212.10:80
209.88.62.54:80
218.44.134.139:80
202.28.68.18:80
212.205.150.5:80
proxy.digitelone.com:8080
212.244.182.67:80
AToulouse-201-2-1-35.abo.wanadoo.fr:80
customer-148-235-65-65.uninet.net.mx:80
proxy.dmn.com.au:8080
proxy.digitelone.com:80
203.154.206.18:8080
200.242.216.150:3128
211.100.0.34:80
195.53.242.35:80
200.24.4.235:80
namesn.wadakogyo.co.jp:8080
194.229.165.179:80
proxy.ual.es:3128
200.14.253.245:80
217.144.0.5:80
213.32.49.5:80
202.28.95.1:80
195.56.183.77:80
210.196.156.202:80
63.107.245.2:3128
195.226.230.67:80
211.99.29.226:8080
206.28.59.106:80
195.57.8.133:80
212.35.243.2:8080
210.235.125.65:80
195.226.230.66:80
61.142.169.98:80
211.100.0.34:8088
fw-serv2.vogel-lube.com:80
svr1.nms.ne.jp:80
193.91.205.91:3128
195.68.114.9:8080
195.255.125.82:80
node15b21.a2000.nl:3128
200.75.42.4:80
212.77.192.17:80
212.80.166.163:8080
195.70.242.210:8080
200.13.225.220:8080
mail.cla.gov.tw:80
62.161.141.23:80
212.137.21.169:80
ns.proserv.co.jp:80
adsl-63-198-132-140.dsl.lsan03.pacbell.net:3128
ns.taiyoshoji.co.jp:80
mail.cotecna.com.pe:80
mail.gedrat.net:80
dsl-64-130-207-133.telocity.com:8080
wall.golf.bs-sports.co.jp:80
mail.koibuchi.ac.jp:80
awhina.rnzfb.org.nz:80
63.98.0.177:80
www.childrenpalace.edu.vn:3128
sealperu.com:80
200.203.159.2:80
207.225.63.2:80
211.236.159.150:8080
210.175.52.100:8080
enteleca-2.dsl.easynet.co.uk:80
ns.tcj-t.co.jp:80
193.49.167.147:80
194.65.77.1:80
211.20.195.43:8080
TSE-SERVER-DNS.tse-net.co.jp:80
194.206.1.44:80
ns.t-artworks.com:80
6gym-kalam.mes.sch.gr:80
server.shepherd.k12.mt.us:80
202.28.68.18:8080
pandora.teimes.gr:8080
dns.jdm.ne.jp:80
lion.kk-tack.co.jp:80
131.165.109.34:80
211.236.159.134:8080
ftp0.plato.co.jp:80
192.117.167.145:80
217.89.45.74:8080
210.243.4.6:80
203.199.64.132:8080
202.129.20.8:80
novagweb.novag.com.mx:80
216-24-57-100.win.net:80
204.184.252.121:80
164.58.28.250:80
ns.shirakabaso.com:80
r207.3.119-18.adinet.com.uy:80
station13.mdsl.com.lb:8080
4lyk-tripol.ark.sch.gr:80
217.89.43.98:8080
209.27.61.36:80
210.196.156.203:80
196.40.43.34:80
dns1.fj-net.co.jp:80
ns.komzg.co.jp:80
210.12.103.24:3128
sv1.ura.co.jp:80
202.106.102.85:8080
196.40.9.146:80
217.57.155.254:80
211.75.54.10:3128
202.110.225.196:80
194.90.133.201:80
195.22.199.146:3128
200.199.249.66:80
200.35.89.146:8080
202.103.37.101:3128
200.44.56.110:80
200.241.164.67:80
adsl-63-204-68-202.dsl.scrm01.pacbell.net:80
168.187.156.241:8080
ip-dns.mckinley.co.jp:8080
210.190.110.13:80
202.9.145.106:8080
dns1.town.nakajima.ehime.jp:80
node13a45.a2000.nl:3128
203.30.170.6:81
212.38.131.30:80
212.0.120.252:8080
is-server.kcs.ac.yu:80
server3.telekom.hr:80
195.22.169.129:80
202.9.170.161:8080
w130.z064002214.chi-il.dsl.cnc.net:3128
210.162.201.115:80
195.75.131.66:8080
200.231.33.233:80
203.93.222.250:80
202.9.170.161:80
203.200.75.165:80
195.130.88.40:80
203.58.25.15:80
www.nisshin-syouji.co.jp:80
ns.itac-ao.co.jp:80
216.72.63.198:8080
office.socrates.co.jp:80
63.112.134.2:80
202.9.136.40:8080
203.130.192.162:80
210.255.65.2:80
193.188.95.146:8080
63.109.255.6:80
196.37.155.66:80
2tee-lamias.fth.sch.gr:80
www.mccann.com.ve:80
202.9.136.40:80
sah2.ye:8080
194.78.66.68:8080
inet01.mr.undp.org:8080
203.197.39.238:80
203.82.192.2:8080
ns.ashikaga-jc-h.ed.jp:8080
61.133.71.205:8080
193.227.168.211:80
cage-e0.peoria.il.bwsys.net:80
203.43.65.211:80
213.29.92.10:3128
196.20.1.37:8080
211.0.82.51:80
202.77.116.14:80
mail.usclcargo.com.hk:80
202.148.3.65:8080
mail.dataform.it:80
ns.reuse.or.jp:80
proxy.druknet.net.bt:8080
proxy.urim.knet.co.il:80
intersv.musashiogose-h.ed.jp:80
200.241.73.130:8080
1sek1-kalam.mes.sch.gr:80
server.scheiber.sulinet.hu:80
ns.jukenkogyo.co.jp:80
192.117.177.142:80
195.42.143.23:3128
shimizu-e-intsv.town.shimizu.fukui.jp:80
202.28.37.4:80
195.22.230.28:8080
194.70.193.128:8080
210.175.125.34:80
ns.h-rc.co.jp:8080
210.254.8.52:8000
195.96.146.114:80
194.74.201.10:8080
61.152.212.248:80
213.29.15.102:3128
dns1.gifukogyo.co.jp:80
140.125.241.1:3128
dns1.sysrun.co.jp:80
www.qdh.or.jp:80
195.47.14.193:80
200.30.47.70:8080
200.30.47.70:80
client-d.visual-park.co.jp:80
211.20.68.74:80
mail1.found.co.jp:80
202.8.227.94:80
www.monolith-prime.co.jp:80
sdsl-64-7-12-211.dsl.chi.megapath.net:80
ns.tew-j.com:80
uptime-nt3.uptime.co.za:80
195.18.91.10:80
211.5.152.98:3128
dns.hartwell.co.jp:8080
server.erkel-bp.sulinet.hu:80
bmihms-s.ozemail.com.au:80
64.123.185.66:80
ras1.cssh.qc.ca:8080
mail.riddellsports.com:80
abeto.accion.com.mx:80
102.227.gdsl.nwc.net:80
server.feketei-ajka.sulinet.hu:80
61.143.6.68:3128
mail.microhard.co.za:8080
ns.ccccc5.com:80
proxy.parlacen.org.gt:80
dial43-227.movinet.com.uy:80
pc188.krebank.main-link.net:80
211.20.154.178:80
210.178.112.1:80
210.179.44.193:8000
211.34.192.250:80
211.35.78.36:80
ittgs002.ittkokusai.co.jp:80
211.35.78.36:8080
210.178.187.250:80
207.167.236.137:80
210.217.5.171:8080
cache.luanda.mstelcom.com:80
pbc.edu.gd:80
206.97.255.82:8080
203.37.71.14:80
211.21.41.2:3128
195.8.1.29:80
proxy.globalctg.net:8080
arado.ctejedor.com.ar:80
192.150.249.114:80
212.98.254.4:80
211.20.164.186:3128
mail.date.com.hk:80
lu3-isdn001.ats.it:80
2.amemuranet.co.jp:80
168.187.154.130:80
210.90.3.43:8080
202.29.4.252:8080
202.129.12.8:8080
195.3.81.47:80
210.249.97.251:80
250.211008164.ccn.ne.jp:80
210.74.254.35:80
211.75.40.186:80
202.9.145.106:80
194.204.236.195:8080
210.176.230.29:80
202.28.37.4:3128
202.39.21.122:80
195.146.49.17:80
10gym-laris.lar.sch.gr:80
211.75.52.106:3128
waroona.wa.edu.au:80
ns.factornet.co.jp:80
dhcp-130.fegs.org.ve:80
ns1.nissinhkltd.com.hk:80
200.44.121.34:80
normandintransit.com:80
210.145.104.3:8080
204.191.243.1:80
202.97.200.98:8080
192.116.162.68:80
tum-56k-158.tpgi.com.au:80
uni-comm.ca:80
ns.smmgnt.co.jp:8080
ns.21-zentsu.com:80
24.132.153.105:3128
server1.lavallette.k12.nj.us:80
211.0.113.202:80
dns.wit.pref.chiba.jp:8080
194.225.166.1:80

hmmm, that's a nifty idea but on the other hand there's probably 50 times that many proxies out there