[#CNetAddr-IsRFC3964]
= xref:CNetAddr.adoc[CNetAddr]::IsRFC3964
:relfileprefix: ../
:mrdocs:

Whether this is an IPv6 6to4 tunnelling address (2002::/16).

== Synopsis

Declared in `<netaddress.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
IsRFC3964() const;
----

== Return Value

True when the address is an IPv6 6to4 tunnelling address.


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