Version 18.104.22.168 (07/27/2020) changes how we store IP addresses.
As part of our effort to minimize the data that we hold on users, we're now hashing (and peppering) the IP addresses that we store.
This follows a change two months ago where we hashed (bcrypt) email addresses.
The reason that we store any IP addresses is so that we can detect networks of malicious accounts, which means that we need the hash of two identical IPs to be the same. We can't realistically salt the IP addresses, because then the values for two identical IPs would not match. We will reconsider this in the future.