What was interesting to me is the search ID, https://www.serverhunter.com/?search=157-857-0B2 for example. Each change results in a new search ID. If you toggle the same option on and off, the search ID is different every time. I originally thought it was a way to reference a unique combination of the facets but it seems to create a new search session for each query.

The search ID is indeed unique, it's a reference to our database which stores your filters, sort order, and column selections.

We might replace it with something that doesn't require the backend at all, but the URLs will end up quite long if you have a few filters selected.

For now, we figured a short URL is nicer to share with other people. :)

Well, a URL that stays valid would be more important than a short URL? I am assuming that you do garbage collect your DB?

We will change the URL structure in the future, but it'll be backwards compatible - old URLs will continue functioning forever. :)