Nobody has an answer for that and I guess @roelandp is the one operating that site (If I'm not wrong). It has been down for maintenance for a very long time.
There are a few alternatives block explorers that can be used and the below is a decentralized version of a block explorer that is open source. The same is being hosted by multiple witnesses. You can give it a try.
https://hivescan.info/
https://hafscan.techcoderx.com/
https://explore.openhive.network/
Ausbitbank and Peakd also have their own block explorer. You can give that a try too.
I think roadscape is/was behind the site-
I have been using hiveblockexplorer. I will try the ones you suggest, thanks.