Network Helper app for iPhone and iPad

On the Resolving tab you can see all IP addresses that belong to a domain of your choice. Additionally it is possible to choose suggested service, that is being used by this domain. It is worth noting that there is a significant difference between domains www.example.com and example.com. Resolving request is being sent to the DNS server.
On the ‘Reverse IP’ tab you can look up which domain is associated with requested IP address. It is also possible to specify a port numerical number to see his associated letter name. IPv4 and IPv6 are both supported.
On the ‘Interfaces’ tab you can see all available network interfaces on your device at the current moment. To update this information you can simply switch to another tab and then come back. Number of available interfaces may depend on the fact of being connected to a Wi-Fi or not, whether you have cellular connection or not.
On the ‘Byte order’ tab you can see which byte order you have on your current device. By the way, byte order in the internet is Big-Endian.