“Boring” explanation from the dig manual page:

> The IN and CH class names overlap with the IN and CH top level domain names. Either use the -t and -c options to specify the type and class, use the -q the specify the domain name, or use "IN." and "CH." when looking up these top level domains.

Off-topic: I got excited when I saw the nicely coloured output from dig which makes it more readable. I thought that maybe the author has some new version that’s not yet available on Ubuntu LTS. Unfortunately, the nice colours are from judicious use of highlight.js¹ – one good reason to have uMatrix configured to allow first-party JavaScript!

¹ https://highlightjs.org/

There's also stuff like this, which will postprocess & color output from any command: https://github.com/garabik/grc, or https://github.com/armandino/TxtStyle