you won't unbderstand it if I told you
IPv6 is what you are referring to Jambutty.
This explains quite a bit
Quote:
Notation
IPv6 addresses are normally written as eight groups of four hexadecimal digits, where each group is separated by a colon ( . For example, 2001:0db8:85a3:08d3:1319:8a2e:0370:7334 is a valid IPv6 address.
If one or more four-digit group(s) is 0000, the zeros may be omitted and replaced with two colons(:. For example, 2001:0db8:0000:0000:0000:0000:1428:57ab can be shortened to 2001:0db8::1428:57ab. Following this rule, any number of consecutive 0000 groups may be reduced to two colons, as long as there is only one double colon used in an address. Leading zeros in a group can also be omitted (as in ::1 for localhost). Thus, the addresses below are all valid and equivalent:
2001:0db8:0000:0000:0000:0000:1428:57ab
2001:0db8:0000:0000:0000::1428:57ab
2001:0db8:0:0:0:0:1428:57ab
2001:0db8:0:0::1428:57ab
2001:0db8::1428:57ab
2001:db8::1428:57ab
Having more than one double-colon abbreviation in an address is invalid, as it would make the notation ambiguous. i.e., Given 2001:0000:0000:FFD3:0000:0000:0000:57ab, 2001::FFD3::57ab could imply 2001:0000:0000:0000:0000:FFD3:0000:57ab, 2001:0000:FFD3:0000:0000:0000:0000:57ab, or any other similar permutation.
A sequence of 4 bytes at the end of an IPv6 address can also be written in decimal, using dots as separators. This notation is often used with compatibility addresses (see below). This addressing scheme is convenient when dealing with the mixed environment of IPv4 and IPv6 addresses. The general notation is of the form x:x:x:x:x:x:d.d.d.d where the x's are the 6 higher order groups of hexadecimal digits whereas the d's correspond to the decimal digits of lower order octets of the address, as it is in the IPv4 format. For example, ::ffff:12.34.56.78 is the same address as ::ffff:0c22:384e and 0:0:0:0:0:ffff:0c22:384e. Usage of this notation is deprecated and unsupported by numerous applications.
Additional information can be found in RFC 4291 - IP Version 6 Addressing Architecture.
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Literal IPv6 addresses in URLs
In a URL the IPv6-Address is enclosed in brackets. Example:
http://[2001:0db8:85a3:08d3:1319:8a2e:0370:7348]/
This notation allows parsing a URL without confusing the IPv6 address and port number:
https://[2001:0db8:85a3:08d3:1319:8a2e:0370:7344]:443/
This is not only useful but mandated when using shortform:
https://[2001:db8::1428:57ab]:443/
Additional information can be found in "RFC 2732 - Format for Literal IPv6 Addresses in URL's" and "RFC 3986 - Uniform Resource Identifier (URI): Generic Syntax."
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Network notation
IPv6 networks are written using CIDR notation.
An IPv6 network (or subnet) is a contiguous group of IPv6 addresses the size of which must be a power of two; the initial bits of addresses, which are identical for all hosts in the network, are called the network's prefix.
A network is denoted by the first address in the network and the size in bits of the prefix (in decimal), separated with a slash. For example, 2001:0db8:1234::/48 stands for the network with addresses 2001:0db8:1234:0000:0000:0000:0000:0000 through 2001:0db8:1234:ffff:ffff:ffff:ffff:ffff
Because a single host can be seen as a network with a 128-bit prefix, you will sometimes see host addresses written followed with /128.
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I'm surprised you are seeing what you see...
I reckon your client is not ipv6 complient and it 'tried its best' to convert the ipv6 to something in ipv4 format