As far as I know, you can not compare telephone data and ip addresses here, this are two different things for the law.
First: telefondata and ip addresses have to be collected by the provider (ISP and mobile company where you get your access) and not the hoster (= Service provider of some sort of content).
I do not think that, lets say an illegal gun shop, shares the ip addresses of their buyers with the police - but the telecom company has to.
http://fm4v3.orf.at/stories/1776727/index.html
This may show the direction I am thinking of.
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https://www.it-law.at/wp-conte…rratsdatenspeicherung.pdf
Here they say "Host-Provider" ... hmmm....