The destination network address of this route, part of the table index. NOTE: this column's SYNTAX is IpAddress (a plain 32-bit IPv4 address) rather than the InetAddress type used everywhere else in this RIPng (IPv6) MIB -- the whole Routes table appears copy-pasted from an IPv4 RIP MIB template without being adapted for IPv6, so treat the address format here with caution. The source DESCRIPTION here is only the placeholder text "Description." (SLE-RIPng-MIB is 100% placeholder/empty DESCRIPTION file-wide), so this reading is inferred from the object name, SYNTAX, and its position in the RIPng control-table pattern.