ntohl

The ntohl function converts a u_long from TCP/IP network order to host byte order (which is little-endian on Intel processors).

Syntax

u_long ntohl(
         u_long netlong
)  

Parameters

netlong
Type: u_long 

[in]

A 32-bit number in TCP/IP network byte order.

Return value

Type: u_long 

The ntohl function returns the value supplied in the netlong parameter with the byte order reversed. If netlong is already in host byte order, then this function will reverse it. It is up to the application to determine if the byte order must be reversed.

Remarks

The ntohl function takes a 32-bit number in TCP/IP network byte order (the AF_INET or AF_INET6 address family) and returns a 32-bit number in host byte order.

The ntohl function can be used to convert an IPv4 address in network byte order to the IPv4 address in host byte order. This function does not do any checking to determine if the netlong parameter is a valid IPv4 address.

The ntohl function does not require that the Winsock DLL has previously been loaded with a successful call to the WSAStartup function.

(Microsoft Store apps): This API is supported.

Requirements

Header: Declared in winsock2.h.

Library: Use ws2_32.lib.