Enumerate all IP addresses on OSX. See: http://stackoverflow.com/questions/21260004/how-to-get-the-ipaddress-of-an-iphone-device-in-universal-application-in-ios

getifaddrs.m

#import <Foundation/Foundation.h>
#import <ifaddrs.h>
#import <arpa/inet.h>

int main(int argc, const char **argv) {
    @autoreleasepool {
        struct ifaddrs *interfaces = NULL;
        if (getifaddrs(&interfaces) == 0) {
            for (struct ifaddrs *ifa = interfaces; ifa; ifa = ifa->ifa_next) {
                char buf[128];
                if (ifa->ifa_addr->sa_family == AF_INET) {
                    inet_ntop(AF_INET, (void *)&((struct sockaddr_in *)ifa->ifa_addr)->sin_addr,
                        buf, sizeof(buf));
                } else if (ifa->ifa_addr->sa_family == AF_INET6) {
                    inet_ntop(AF_INET6, (void *)&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr,
                        buf, sizeof(buf));
                } else {
                    continue;
                }

                NSLog(@"name=%s, family=%u, address=%s",
                    ifa->ifa_name, (unsigned)ifa->ifa_addr->sa_family, buf);
            }
        }
        freeifaddrs(interfaces);
    }
    return 0;
}

Output

2014-01-21 14:57:39.317 getifaddrs[31705:707] name=lo0, family=30, address=fe80::1
2014-01-21 14:57:39.319 getifaddrs[31705:707] name=lo0, family=2, address=127.0.0.1
2014-01-21 14:57:39.319 getifaddrs[31705:707] name=lo0, family=30, address=::1
2014-01-21 14:57:39.320 getifaddrs[31705:707] name=en1, family=30, address=fe80::fa1a:67ff:fe0e:30eb
2014-01-21 14:57:39.320 getifaddrs[31705:707] name=en1, family=2, address=192.168.1.100