Return MOTD/player count based on which IP the player is joining with?

I'm making a plugin to sort of replicate the functions of Bungeecord for PC. I used the LoginPacket to get the IP the player is joining with and Player#transfer to send them to the correct IP based on the subdomain, but I can't figure out where I can do the same with the server info.

I just need to know what packet or event to listen for so I can get the IP they joined with and send back playercount and stuff. In Spigot for PC there's a ServerListPingEvent for this.