IPv4 is 32 bits IP address that we use commonly, it can be 192.168.8.1, 10.3.4.5 or other 32 bits IP addresses. IPv4 can support up to 232 addresses, however the 32 bits IPv4 addresses are finishing to be used in near future, so IPv6 is developed as a replacement. IPv6 is 128 bits, can support up to 2128 addresses to fulfill future needs with better security and network related features. Here are some examples of IPv6 address: 1050:0:0:0:5:600:300c:326b ff06::c3 0:0:0:0:0:0:192.1.56.10 there are 100 countries with IPv6 allocations! Nigeria was the 100th country to receive one! The first 100 countries with IPv6 allocations: Andorra Angola Argentina Armenia Asian Pacific Australia Austria Bahrain Bangladesh Belgium Bermuda Bolivia Brazil Bulgaria Cameroon Canada Chile China Colombia Costa Rica Croatia Cuba Cyprus Czech Republic Denmark Dominican Republic Egypt Estonia Europe Finland France Germany Greece Guatemala Haiti Hong Kong Hungary Iceland India Indonesia International Iran Ireland Israel Italy Japan Kenia Korea Latvia Lithuania Luxembourg Macao Malawi Malaysia Malta Mauritius Mexico Monaco Morocco Netherlands, The New Zealand Nicaragua Nigeria Norway Oman Pakistan Panama Papua New Guinea Paraguay Peru Philippines Poland Portugal Qatar Romania Russia Saudi Arabia Serbia and Montenegro Singapore Slovakia Slovenia South Africa Spain Sudan Sweden Switzerland Taiwan Tanzania Thailand Tunisia Turkey Ukraine United Arab Emirates United Kingdom (Great Britain) United States Uruguay Vatican City Venezuela Vietnam Yugoslavia