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There are many NTP servers like time.google.com time.cloudfare.com and so on . Do these services log ip addresses of the visitors?Have heard that http servers do log ip addresses and though not related to this qestion , removal of ip address is required by GDPR.

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It's not common for NTP servers to keep log data of requests from clients, although they can.

Computers configured to synchronize with certain NTP server aren't considered visitors as with web sites, because the setup is typically more permanent.

IP addresses aren't (necessarily) PII per GDPR, unless they are used as Online identifiers for profiling and identification (Recital 30). That would be highly unlikely with NTP, as there wouldn't even be point in profiling NTP users.

Esa Jokinen
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Network Time wouldn't have personal data, so it would be a moot point. Here's the wiki page for you to read.

https://en.wikipedia.org/wiki/General_Data_Protection_Regulation

Mark Scheck
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  • The Wikipedia article of GDPR is an awfully wide and unofficial source compared to narrow perspective in the question. Therefore, it's not that useful as a reference here. – Esa Jokinen Nov 06 '20 at 16:47
  • An IP address in conjunction of a timestamp is a personal data. In many cases even the ip alone address is a personal data. – Daniel Nov 06 '20 at 16:52
  • An IP and a timestamp is not personally identifiable information in regards to NTP! Unless it can be correlated to a name and address. I didn't want to include the regs themselves since they are quite heavy reading. But I'll try and find some others to improve the answer. – Mark Scheck Nov 07 '20 at 08:33