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htonl(3) Library Functions Manual htonl(3) NAME htonl - Converts an unsigned 32-bit integer from host byte order to In- ternet network-byte order LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <arpa/inet.h> in_addr_t htonl ( in_addr_t hostint) ; STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: htonl(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies a 32-bit integer in host byte order. DESCRIPTION The htonl() (host-to-network long) function converts an unsigned 32-bit integer from host byte order to Internet network-byte order. The Internet network requires address and port reference data in net- work-byte order. Use the htonl() function to convert address and port integers from Internet host byte order to Internet network-byte ordered integers. RETURN VALUES Upon successful completion, the htonl() function returns a 32-bit inte- ger in Internet network-byte order. ERRORS Current industry standards do not define error values for the htonl() function. RELATED INFORMATION Functions: endhostent(3), endservent(3), htons(3), ntohl(3), ntohs(3) Standards: standards(5) Network Programmer's Guide delim off htonl(3)