Block dns lookup

I setup a connection with PPP for testing and everything is working fine.
I have a pi setup not doing anything and if i just leave it running i use about 350Kb of data on the sim card every hour. this will add up over the month to like 100mb of data with no usage.
i ran iftop and see is what runs ever 10-30 secs or so using up some data.
how can i block this lookup. the main goal is to use as little data as possible as we will have a mqtt connection transmitting data back but if there is no mqtt data to send we dont want excess data being wasted.

Hi @gt1,

Which module are you using? Are you connected over PPP all the time? Do you use the reconnect.service? Are you using MQTT based on the AT command manual of the modules?