Game says 44. Not sure if that includes the 9 space ships or not.
WoWS Stats & Numbers says 51 after old versions of ships accounted for.
No port slots open. Never gotten one from a container. Been working on Campaigns because I'm *this close* to getting 2 port slots from one. Wish I would have known that 75% off port slots was a rarity when I started playing on New Years because I would have stocked up!