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Anycasting allows you to have multiple servers in different data centers all share the same IP. IRCNow currently uses BuyVM, which provides anycasting free of charge for customers that purchase 3 VMs with them provided they are all in different data centers.
The benefit is that, whenever a user connects to your network, he will request from the server that is closest to him, reducing the latency of the connection.
To set up anycasting, you simply need to configure /etc/hostname.if0:
Suppose
inet 192.0.2.1 255.255.255.0 inet alias 192.1.0.1 255.255.255.255 inet6 ffef:6400:0000:0000:: 48 #inet6 autoconf