---
name: "ne_iaddr_make"
section: "3"
platform: "linux"
package: "neon"
version: "0.37.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/ne_iaddr_make"
---

# ne\_iaddr\_make(3)

functions to manipulate network addresses

## NAME

ne\_iaddr\_make, ne\_iaddr\_cmp, ne\_iaddr\_print, ne\_iaddr\_typeof, ne\_iaddr\_parse, ne\_iaddr\_raw, ne\_iaddr\_put, ne\_iaddr\_reverse, ne\_iaddr\_free - functions to manipulate network addresses

## SYNOPSIS

```
#include <ne_socket.h>
typedef enum {
    ne_iaddr_ipv4 = 0,
    ne_iaddr_ipv6
} ne_iaddr_type;
```

**ne\_inet\_addr \*ne\_iaddr\_make(ne\_iaddr\_type** *type***, const unsigned char \****raw***);**

**int ne\_iaddr\_cmp(const ne\_inet\_addr \****ia1***, const ne\_inet\_addr \****ia2***);**

**char \*ne\_iaddr\_print(const ne\_inet\_addr \****ia***, char \****buffer***, size\_t** *bufsiz***);**

**ne\_iaddr\_type ne\_iaddr\_typeof(const ne\_inet\_addr \****ia***);**

**ne\_inet\_addr \*ne\_iaddr\_parse(const char \****address***, ne\_iaddr\_type** *type***);**

**unsigned char \*ne\_iaddr\_raw(const ne\_inet\_addr \****ia***, unsigned char \****buffer***);**

**ne\_inet\_addr \*ne\_iaddr\_put(ne\_inet\_addr \****ia***, ne\_iaddr\_type** *type***, const unsigned char \****raw***);**

**int ne\_iaddr\_reverse(const ne\_inet\_addr \****ia***, char \****buffer***, size\_t** *buflen***);**

**void ne\_iaddr\_free(ne\_inet\_addr \****ia***);**

## DESCRIPTION

**ne\_iaddr\_make** creates an **ne\_inet\_addr** object from a raw binary network address; for instance the four bytes 0x7f 0x00 0x00 0x01 represent the IPv4 address 127.0.0.1. The object returned is suitable for passing to **ne\_sock\_connect**. A binary IPv4 address contains four bytes; a binary IPv6 address contains sixteen bytes; addresses passed must be in network byte order.

**ne\_iaddr\_cmp** compares two network address objects; returning zero only if they are identical. The objects need not have the same address type; if the addresses are not of the same type, the return value is guaranteed to be non-zero.

**ne\_iaddr\_print** prints a human-readable string representation of a network address into a buffer, for instance the string "127.0.0.1".

**ne\_iaddr\_typeof** returns the type of the given network address object.

**ne\_iaddr\_put** changes an existing network address object to a new raw byte representation given by parameter *type* (which can be different to the current type of the object). The raw data must be of length 4 bytes for an IPv4 address, or 16 bytes for an IPv6 address.

**ne\_iaddr\_parse** parses a string representation of a network address (such as "127.0.0.1" and creates a network address object to represent the parsed address.

**ne\_iaddr\_raw** writes the raw byte representation of a network address to the provided buffer. The bytes are written in network byte order; the buffer must be of suitable length for the type of address (4 bytes for an IPv4 address, 16 bytes for an IPv6 address).

**ne\_iaddr\_reverse** performs a reverse name lookup on the address object, writing the (first) hostname associated with the IP address to the provided buffer. If the hostname is longer than the buffer it will be silently truncated; on success the string written to the buffer is always NUL-terminated.

**ne\_iaddr\_free** releases the memory associated with a network address object.

## RETURN VALUE

**ne\_iaddr\_make** returns NULL if the address type passed is not supported (for instance on a platform which does not support IPv6).

**ne\_iaddr\_print** returns the *buffer* pointer, and never NULL.

**ne\_iaddr\_parse** returns a network address object on success, or NULL on failure to parse the *address* parameter.

**ne\_iaddr\_reverse** returns zero on success or non-zero if no hostname is associated with the address.

**ne\_iaddr\_raw** returns the *buffer* parameter, and never NULL.

**ne\_iaddr\_put** returns the passed in *ia* parameter, or NULL if the address type passed is not supported (for instance on a platform which does not support IPv6).

## EXAMPLES

The following example connects a socket to port 80 at the address 127.0.0.1.

```
unsigned char addr[] = "\0x7f\0x00\0x00\0x01";
ne_inet_addr *ia;
ia = ne_iaddr_make(ne_iaddr_ipv4, addr);
if (ia != NULL) {
    ne_socket *sock = ne_sock_connect(ia, 80);
    ne_iaddr_free(ia);
    /* ... */
} else {
    /* ... */
}
```

## HISTORY

The **ne\_iaddr\_raw** function is available in neon 0.29.0 and later.

The **ne\_iaddr\_put** function is available in neon 0.37.0 and later.

## SEE ALSO

[**ne\_addr\_resolve**(3)](/ne_addr_resolve/3.md)

## COPYRIGHT

Copyright © 2001-2026 Joe Orton\