size_t ipv4_len = 0;
if (is_ipv4_prefix(host, &ipv4_len)) {
    // Cloak the entire IPv4 prefix
    ircd_snprintf(0, result, HOSTLEN, "%s-%X", PREFIX, alpha);
    strncat(result, host + ipv4_len, HOSTLEN - strlen(result) - 1);
    return result;
}