Looks great but these services have a tendency to come and go. Bad actors just end up hammering it. But I've been using icanhazip.com for years and it's still going strong.
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If the software behind the service is available and looks like it'll be easily usable for years because it has few to no dependancies that are likely to deprecated, I might actually commit the effort to memory and use it for all similar demands, similar to how I keep track of specific CLI *nix tools which I can rest assured, even if there are no updates and potential security issues, most are going to be usable at some future date in a pinch.