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+PR_GetProtoByNumber
+===================
+
+Looks up a protocol entry based on protocol's number.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prnetdb.h>
+
+   PRStatus PR_GetProtoByNumber(
+     PRInt32 protocolnumber,
+     char* buffer,
+     PRInt32 bufsize,
+     PRProtoEnt* result);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``protocolnumber``
+   The number assigned to the protocol.
+``buffer``
+   A pointer to a scratch buffer for the runtime to return result. This
+   buffer is allocated by the caller.
+``bufsize``
+   Number of bytes in the ``buffer`` parameter. The buffer must be at
+   least :ref:`PR_NETDB_BUF_SIZE` bytes.
+``result``
+   On input, a pointer to a :ref:`PRNetAddr` structure. On output, this
+   structure is filled in by the runtime if the function returns
+   ``PR_SUCCESS``.
+
+
+Returns
+~~~~~~~
+
+The function returns one of the following values:
+
+-  If successful, ``PR_SUCCESS``.
+-  If unsuccessful, ``PR_FAILURE``. You can retrieve the reason for the
+   failure by calling :ref:`PR_GetError`.