It's a dynamic dns subdomain, which appears to have lapsed. It's not likely to return back to what it was.
You can get a good estimate of when tx will clear by watching the climbing or falling trend here:
https://jochen-hoenicke.de/queue/#2d
Select the fee range that matches the tx fee.
If your fee is low then you will need to wait until the graph trends down for you to have a chance.
Topic: mempool.us.to/tx.html (Read 447 times)
Anybody know when this site is coming back?
Estimates blocks until txid passes
Estimates blocks until txid passes
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