Well, at least they registered Altaba.com. No IP address as of now, though it looks like their mail is handled by Google Apps!
Altaba will still be holding all of the other assets not sold to verizon so this is likely the best way to move forward for whoever is left working for this not quite dead entity once the sale is complete.
$ host Altaba.com
Altaba.com mail is handled by 10 alt4.aspmx.l.google.com.
Altaba.com mail is handled by 1 aspmx.l.google.com.
Altaba.com mail is handled by 5 alt1.aspmx.l.google.com.
Altaba.com mail is handled by 5 alt2.aspmx.l.google.com.
Altaba.com mail is handled by 10 alt3.aspmx.l.google.com.
Here's yahoo.com for reference: $ host yahoo.com
yahoo.com has address 206.190.36.45
yahoo.com has address 98.138.253.109
yahoo.com has address 98.139.183.24
yahoo.com has IPv6 address 2001:4998:58:c02::a9
yahoo.com has IPv6 address 2001:4998:c:a06::2:4008
yahoo.com has IPv6 address 2001:4998:44:204::a7
yahoo.com mail is handled by 1 mta7.am0.yahoodns.net.
yahoo.com mail is handled by 1 mta5.am0.yahoodns.net.
yahoo.com mail is handled by 1 mta6.am0.yahoodns.net.altaba.com. 1800 IN TXT "google-site-verification=vO3De5z6qb-AeM1GmHkcC5dlWA_cw-7WKN5xhcyFFPM"