---
name: "dns_name4"
section: "3"
platform: "linux"
package: "libowfat-dev"
version: "0.32-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/dns_name4"
---

# dns\_name4(3)

look up host name

## NAME

dns\_name4 - look up host name

## SYNTAX

**#include \<libowfat/dns.h\>**

int **dns\_name4**(stralloc\* *out*,const char\* *ip*\[4\]);

## DESCRIPTION

dns\_name4 looks up the domain name for the 4-byte IP address in *ip*. It puts the (first) domain name into *out* and returns 0. If the relevant in-addr.arpa domain does not exist in DNS, or has no PTR records, *out* will be empty.

If dns\_name4 has trouble with the DNS lookup or runs out of memory, it returns -1, setting errno appropriately. It may or may not change *out*.

## SEE ALSO

[dns\_name\_packet(3)](/dns_name_packet/3.md), [dns\_name4\_domain(3)](/dns_name4_domain/3.md), [dns\_name6(3)](/dns_name6/3.md), [dns\_ip4(3)](/dns_ip4/3.md)