These are examples of addresses that I have come across while I have been reading about IPv6. Sometimes finding a invalid/bad address will take a bit longer until we all get comfortable with the shorthand and conventions of a properly formatted IPv6 address. If you have one that you dont see here, email it to me and I will add it.
|1200:0000:AB00:1234:0000:2552:7777:1313||Yes||Hex characters are valid in IPv6|
|1200::AB00:1234::2552:7777:1313||No||Can only use :: once in an address|
|[2001:db8:0:1]:80||Yes||Example of IPv6 address specifying a port number|
|http://[2001:db8:0:1]:80||Yes||Example of URL specifying a port number|
|21DA:D3:0:2F3B:2AA:FF:FE28:9C5A||Yes||Leading 0′s can be dropped from each quartet|
|1200:0000:AB00:1234:O000:2552:7777:1313||No||Invalid character in field of what looks to be all 0′s|