Here are some quick tools and scripts I’ve put together over the years:
dWHO.IS Lookup
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Pingdom Probe IPs
Pingdom helpfully offer a RSS feed of their monitoring nodes.
I created a simple script which extracts the IPs from this XML feed and present a list of IPs in both plain-text and HTML.
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VAT Number Validation
Simple validator for EU VAT numbers to see immediately if it’s valid.