The dynamic dns for mobile devices

It has been released the new version of the app DnsUp! The most important novelty concerns the possibility of tracing the ip of the mobile device on which the application is installed.
The system automatically attaches the device to the first host on the list. Through the configuration panel the user can change this choice and eventually suspend the association between the host and the device.

The other important novelty concerns the possibility to configure a host directly from the application. The system checks for the presence of at least one host: if there is nothing to be found, asks the user to set one up so you can start working immediately.

Remain the features of the previous version, then the host monitor, and ip broadcast. This is very useful to know at any moment the state of health of the system and intervene promptly in case some host may be blocked, for example because it is expired the period of validity of the subscription or because they were sent too many ip offences.

Since 2007, the year of the launch of the smartphone from Apple, the growth of mobile devices connected in the network has been exponential.
Before this date had already been highlighted, the problem related to the exhaustion of IpV4 addresses and the need to switch to IpV6, the event that has not yet occurred.
The arrival of the smartphone has been fatal because it is immediately understood that the number of required resources would not be adequate to cover the increasing demand (2.5 billion expected in 2019).
If we consider that IpV4 provides 4 billion addresses, and that he was already in a crisis, you understand that you are due to put in field right from the strategy to hide the smartphone to the Internet!

It seems paradoxical, but the majority of the smartphone is not seen directly from the Internet because she lives in the subnetworks.
This simple stratagem enabled him to overcome the obstacles dictated by the limitations of IpV4 and put in the network a potentially infinite number of devices.
As we will see later to be in a subnet has some disadvantages that do not involve those who have the good fortune to have a public ip.
Who provides the connection to the internet, typically the telephony operators, have some public IP and many private IP. The latter are used to identify the mobile devices allowing him to interact with the web.
This system can be compared to that of a home or corporate network typically find a router that has the public IP and many devices, computers, printers, etc... identified by a private IP, one for each.
The public IP has a cost (usually included in the fee for telephone monthly), while the private IP are free because they are managed directly by the owner of the subnet (often unknowingly as in the case of home networks).

The solution just must be good in the majority of cases, that is when from your smartphone I need access to the Internet, for example, to search for information on the Web or to send messages.
If, instead, from the Internet I need access to the smartphone, the situation is complicated because the devices in a subnet are not directly accessible by requests that arrive from the outside.

The IP associated to the device, the same IP that is logged on DnsUp, it is usually the IP subnet. You can see, in fact, that the record of registration shows a source IP different than the recording because the first one is public (owned by the service provider) while the second is the private assigned to the smartphone.
However, if the two addresses coincide, then it is confirmed that the used IP is really public, and allows the accessibility of a mobile device.