So an IPv6 address is made of 128/4 = 32 hexadecimal digits. the usual hex dotted representation groups 4 hex and separate these groups using a ':'. So an IPv6 address is made of 8 4hex groups divided by : the notation allows to represent one of more 4 hex consecutive groups made of all zeroes with a ::
https://supportforums.cisco.com/discussion/10874741/valid-ipv6-address
IPv4 addresses may be represented in any notation expressing a 32-bit integer value. They are most often written in the dot-decimal notation, which consists of four octets of the address expressed individually in decimal numbers and separated by periods.
https://en.wikipedia.org/wiki/IPv4
An IP address is a set of numbers that identify your computer on a network. IPV4, the traditional numbering scheme, uses four integers ranging from zero to 255 and set apart by periods. For example, 204.120.0.15 is a valid IPV4 address.
http://smallbusiness.chron.com/ip-address-invalid-68006.html
2002:7654:a1ad:0061:81af:ccc1. Here we see only 6 4-hex groups, no :: appears in the middle to represent all zero groups so it is too short. an IPv6 prefix is represented with a final ::/prefix length. this is not a valid IPv6 address because it is too short, it could be an IPv6 prefix if written as: 2002:7654:a1ad:61:81af:ccc1::/96. see.
https://supportforums.cisco.com/discussion/10874741/valid-ipv6-address
Internet Protocol version 4 (IPv4) is the fourth version of the Internet Protocol (IP). It is one of the core protocols of standards-based internetworking methods in the Internet, and was the first version deployed for production in the ARPANET in 1983.
https://en.wikipedia.org/wiki/IPv4
Decomposition of the quad-dotted IPv4 address representation to its binary value. IPv4 uses 32-bit (four-byte) addresses, which limits the address space to 4294967296 (232) addresses. This limitation stimulated the development of IPv6 in the 1990s, which has been in commercial deployment since 2006.
https://en.wikipedia.org/wiki/IPv4
The message Invalid IP Address indicates a problem with your computer's network setup. Every computer that uses an Ethernet-type network, such as the Internet, has an Internet Protocol address that lets other computers communicate with it. Without a valid IP address your computer cannot use the network.
http://smallbusiness.chron.com/ip-address-invalid-68006.html
What is a Valid IP Address? A valid IP address must be in the form of xxx.xxx.xxx.xxx, where xxx is a number from 0-255. There are a few reserved addresses (RFC 1918) that cannot be used. 10.x.x.x cannot be used along with 192.168.x.x, 172.16.0.0 to 172.31.255.255.
http://www.noip.com/support/knowledgebase/what-is-a-valid-ip-address/
F is ok it is the unspecified address like 0.0.0.0 in IPv4. E is a valid network address. C is ok. B begins with 2002 so it is reserved for 6to4 tunnel which is a /48 and the last bits are derived from IPv4 address so here this is an invalid address. D is a deprecated address but still valid imho. A is a /8 so not a valid address. So I would say A and B are invalid ones. Regards. Alain.
https://learningnetwork.cisco.com/thread/34410
Home/Knowledge Base/DNS. A valid IP address must be in the form of xxx.xxx.xxx.xxx, where xxx is a number from 0-255. There are a few reserved addresses (RFC 1918) that cannot be used. 10.x.x.x cannot be used along with 192.168.x.x, 172.16.0.0 to 172.31.255.255.
http://www.noip.com/support/knowledgebase/what-is-a-valid-ip-address/
what are valid ipv4 address
A valid Internet Protocol Version 4 address is the address in the form of xxx.xxx.xxx.xxx, where xxx is a number from 0 to 255.