Restoring certain APN settings after a wipe or a flash drive ROM is a thing, which bothers almost every user and takes much of your time as well. Xda senior members CarpeNoctem have developed an APN Generator, which generates an XML backup that contains all the APN data. You can then easily export all your data or even import your data after flashing your ROM or complete wipe.
The developer is collecting all the database of the well-known APN settings. Though the work isn’t yet completed but it will be done soon. So for all those users who have wasted their time in re-entering the APN settings after flashing or after wiping off the data, should say thanks to the developer who have made this and saved precious time of many users out there.
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Source: xda Developers