zlookup was a website based in the United Kingdom. As of now zlookup is not available. The domain on which it was hosted is no longer renewed by the owner.
It is highly unlikely that the current owner will renew the zlookup website.
Note: There are many websites which keep on appearing with other domain extensions. But the original website is not available.
And as of: February 7, 2023, this site is still not available on the Internet.