I think I found the domain name of #Threads, #Meta's new #Fedi-enabled service, also codenamed #Project92, #P92, and #Barcelona.
URL: https://threads.net
IPv4: 157.240.22.63
IPv6: 2a03:2880:f231:c5:face:b00c:0:43fe (note "face:b00c")
Looking up threads.net returns #Instagram's logo, the title "Barcelona" and "this page isn't available" (probably because it's not open yet).
I'd recommend every #MastoAdmin #FediAdmin in the #FediPact to #FediBlock them before they go live on the #Fediverse!