System Administration Guide, Volume 3

ipnodes Database

The ipnodes database contains the IPv6 addresses and host names of machines on your network. If you use the NIS, NIS+, or DNS name services, the ipnodes database is maintained in a database designated for host information. For example, on a network running NIS+, the ipnodes database is maintained in the host table. For more information about the ipnodes database, see "/etc/inet/ipnodes File".