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A major problem in IT security is compromised user accounts. This happens through phishing, customer database breaches at large companies, spreading incidents in collaborating infrastructures, etc. Unless attackers execute actions that trigger alarms (ex. bulk spam mail), it is difficult to detect that an account has been compromised. To address this problem CERN, Google, Apple and others have implemented tools that helps their users detect potentially malicious logins to their acconts. Nikhef provides this functionality through the: Login from unusual location warning system.

When you connect to Nikhef services over the internet, the warning system checks if the remote IP address used to sign in to Nikhef is from a known/trusted pool of IP addresses. If the remote IP address/user account combination is unknown to the system, it sends a mail to the user, with the time and place (geo location remote IP) of the sign-in. If you do not recognize the time/remote IP geolocation you are then asked to contact Nikhef-Helpdesk.
If you do not react, the system will automatically add domain of the IP address stated in the warning message to the trusted pool. At the beginning you will receive a few mails from the warning system, in particular if you are using Nikhef mail on your mobile devices (phones, tablets, etc). The mails will get less once the usual domains are added to the trusted pool for you.

Internet geo-location data is approximate, and for residential connections in the Netherlands may be deliberately misplaced to preserve your privacy. If your internet service provider (ISP) name matches the name of the network, and the location is given as the Netherlands, this is more accurate that the geo-location information.
Some ISPs operate under different brand names, or use network address space from subsidiaries. For example, KPN is also known as "Telfort", "Hi", or "DirectADSL". Your Ziggo subscription may show up as "UPC", "A2000", or "@Home", Connexion busses use Tele-2 as a provider, et cetera. Contact the Helpdesk of Nikhef CSIRT in case of doubt.