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# PR_NETDB_BUF_SIZE
Recommended size to use when specifying a scratch buffer for
{ref}`PR_GetHostByName`, {ref}`PR_GetHostByAddr`, {ref}`PR_GetProtoByName`, or
{ref}`PR_GetProtoByNumber`.
## Syntax
```{code}
#include <prnetdb.h>
#if defined(AIX) || defined(OSF1)
#define PR_NETDB_BUF_SIZE sizeof(struct protoent_data)
#else
#define PR_NETDB_BUF_SIZE 1024
#endif
```