Amp

handy reference if you need / want to blacklist entire countries.

.ac ? Ascension Island
.ad ? Andorra
.ae ? United Arab Emirates
.af ? Afghanistan
.ag ? Antigua and Barbuda
.ai ? Anguilla
.al ? Albania
.am ? Armenia
.an ? Netherlands Antilles
.ao ? Angola
.aq ? Antarctica
.ar ? Argentina
.as ? American Samoa
.at ? Austria
.au ? Australia
.aw ? Aruba
.az ? Azerbaijan
.ax ? Aland Islands
.ba ? Bosnia and Herzegovina
.bb ? Barbados
.bd ? Bangladesh
.be ? Belgium
.bf ? Burkina Faso
.bg ? Bulgaria
.bh ? Bahrain
.bi ? Burundi
.bj ? Benin
.bm ? Bermuda
.bn ? Brunei Darussalam
.bo ? Bolivia
.br ? Brazil
.bs ? Bahamas
.bt ? Bhutan
.bv ? Bouvet Island
.bw ? Botswana
.by ? Belarus
.bz ? Belize
.ca ? Canada
.cc ? Cocos (Keeling) Islands
.cd ? Congo, The Democratic Republic of the
.cf ? Central African Republic
.cg ? Congo, Republic of
.ch ? Switzerland
.ci ? Cote d'Ivoire
.ck ? Cook Islands
.cl ? Chile
.cm ? Cameroon
.cn ? China
.co ? Colombia
.cr ? Costa Rica
.cs ? Serbia and Montenegro
.cu ? Cuba
.cv ? Cape Verde
.cx ? Christmas Island
.cy ? Cyprus
.cz ? Czech Republic
.de ? Germany
.dj ? Djibouti
.dk ? Denmark
.dm ? Dominica
.do ? Dominican Republic
.dz ? Algeria
.ec ? Ecuador
.ee ? Estonia
.eg ? Egypt
.eh ? Western Sahara
.er ? Eritrea
.es ? Spain
.et ? Ethiopia
.fi ? Finland
.fj ? Fiji
.fk ? Falkland Islands (Malvinas)
.fm ? Micronesia, Federal State of
.fo ? Faroe Islands
.fr ? France
.ga ? Gabon
.gb ? United Kingdom
.gd ? Grenada
.ge ? Georgia
.gf ? French Guiana
.gg ? Guernsey
.gh ? Ghana
.gi ? Gibraltar
.gl ? Greenland
.gm ? Gambia
.gn ? Guinea
.gp ? Guadeloupe
.gq ? Equatorial Guinea
.gr ? Greece
.gs ? South Georgia and the South Sandwich Islands
.gt ? Guatemala
.gu ? Guam
.gw ? Guinea-Bissau
.gy ? Guyana
.hk ? Hong Kong
.hm ? Heard and McDonald Islands
.hn ? Honduras
.hr ? Croatia/Hrvatska
.ht ? Haiti
.hu ? Hungary
.id ? Indonesia
.ie ? Ireland
.il ? Israel
.im ? Isle of Man
.in ? India
.io ? British Indian Ocean Territory
.iq ? Iraq
.ir ? Iran, Islamic Republic of
.is ? Iceland
.it ? Italy
.je ? Jersey
.jm ? Jamaica
.jo ? Jordan
.jp ? Japan
.ke ? Kenya
.kg ? Kyrgyzstan
.kh ? Cambodia
.ki ? Kiribati
.km ? Comoros
.kn ? Saint Kitts and Nevis
.kp ? Korea, Democratic People's Republic
.kr ? Korea, Republic of
.kw ? Kuwait
.ky ? Cayman Islands
.kz ? Kazakhstan
.la ? Lao People's Democratic Republic
.lb ? Lebanon
.lc ? Saint Lucia
.li ? Liechtenstein
.lk ? Sri Lanka
.lr ? Liberia
.ls ? Lesotho
.lt ? Lithuania
.lu ? Luxembourg
.lv ? Latvia
.ly ? Libyan Arab Jamahiriya
.ma ? Morocco
.mc ? Monaco
.md ? Moldova, Republic of
.mg ? Madagascar
.mh ? Marshall Islands
.mk ? Macedonia, The Former Yugoslav Republic of
.ml ? Mali
.mm ? Myanmar
.mn ? Mongolia
.mo ? Macau
.mp ? Northern Mariana Islands
.mq ? Martinique
.mr ? Mauritania
.ms ? Montserrat
.mt ? Malta
.mu ? Mauritius
.mv ? Maldives
.mw ? Malawi
.mx ? Mexico
.my ? Malaysia
.mz ? Mozambique
.na ? Namibia
.nc ? New Caledonia
.ne ? Niger
.nf ? Norfolk Island
.ng ? Nigeria
.ni ? Nicaragua
.nl ? Netherlands
.no ? Norway
.np ? Nepal
.nr ? Nauru
.nu ? Niue
.nz ? New Zealand
.om ? Oman
.pa ? Panama
.pe ? Peru
.pf ? French Polynesia
.pg ? Papua New Guinea
.ph ? Philippines
.pk ? Pakistan
.pl ? Poland
.pm ? Saint Pierre and Miquelon
.pn ? Pitcairn Island
.pr ? Puerto Rico
.ps ? Palestinian Territories
.pt ? Portugal
.pw ? Palau
.py ? Paraguay
.qa ? Qatar
.re ? Reunion Island
.ro ? Romania
.ru ? Russian Federation
.rw ? Rwanda
.sa ? Saudi Arabia
.sb ? Solomon Islands
.sc ? Seychelles
.sd ? Sudan
.se ? Sweden
.sg ? Singapore
.sh ? Saint Helena
.si ? Slovenia
.sj ? Svalbard and Jan Mayen Islands
.sk ? Slovak Republic
.sl ? Sierra Leone
.sm ? San Marino
.sn ? Senegal
.so ? Somalia
.sr ? Suriname
.st ? Sao Tome and Principe
.sv ? El Salvador
.sy ? Syrian Arab Republic
.sz ? Swaziland
.tc ? Turks and Caicos Islands
.td ? Chad
.tf ? French Southern Territories
.tg ? Togo
.th ? Thailand
.tj ? Tajikistan
.tk ? Tokelau
.tl ? Timor-Leste
.tm ? Turkmenistan
.tn ? Tunisia
.to ? Tonga
.tp ? East Timor
.tr ? Turkey
.tt ? Trinidad and Tobago
.tv ? Tuvalu
.tw ? Taiwan
.tz ? Tanzania
.ua ? Ukraine
.ug ? Uganda
.uk ? United Kingdom
.um ? United States Minor Outlying Islands
.us ? United States
.uy ? Uruguay
.uz ? Uzbekistan
.va ? Holy See (Vatican City State)
.vc ? Saint Vincent and the Grenadines
.ve ? Venezuela
.vg ? Virgin Islands, British
.vi ? Virgin Islands, U.S.
.vn ? Vietnam
.vu ? Vanuatu
.wf ? Wallis and Futuna Islands
.ws ? Western Samoa
.ye ? Yemen
.yt ? Mayotte
.yu ? Yugoslavia
.za ? South Africa
.zm ? Zambia
.zw ? Zimbabwe