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# PR_ConvertIPv4AddrToIPv6
Converts an IPv4 address into an (IPv4-mapped) IPv6 address.
## Syntax
```{code}
#include <prnetdb.h>
void PR_ConvertIPv4AddrToIPv6(
PRUint32 v4addr,
PRIPv6Addr *v6addr
);
```
## Parameters
The function has the following parameters:
`v4addr`
: The IPv4 address to convert into an IPv4-mapped IPv6 address. This
must be specified in network byte order.
`v6addr`
: A pointer to a buffer, allocated by the caller, that is filled in
with the IPv6 address on return.