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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It is a GitHub project, there's already an issue for the UK:
https://github.com/mpolden/echoip/issues/130
Perhaps you ought to open one for Norway? (I don't think it would be appropriate for me to do it because I am not seeing the issue, not being in Norway.)
I had some auto-tests for VPN app which were relying on similar web-service to check own IP address. One day service become unavailable and autotests got broken. IIRC it was (https://canihazip.com/s)
I decided to solve this task in a fast and reliable fashion, so I made a tool which discovers own IP address using major public STUN servers: https://github.com/Snawoot/myip
Program issues parallel queries to public STUN servers to determine public IP address and returns result as soon as quorum of matching responses reached.
Works fast and reliable, especially compared to services requiring HTTPS:
user@dt1:~> time curl https://api.ipify.org