As far as I remember this is auto-generated name of network if you do not name explicitly this network. You can check in file
/usr/samples/tcpip/networks for sample file about network naming in AIX.
Here is extract from AIX documentation (7.1):
The /etc/networks file contains information about the known networks
that comprise the DARPA Internet. Each network is represented by a
single line in the networks file. The format for the entries in the
networks file is:
Name Number Aliases
The fields are described as follows: Item Description Name Specifies
an official network name. Number Specifies a network number. Aliases
Specifies any unofficial names used for the network.
Items on a line are separated by one or more spaces or tab characters.
Comments begin with a # (pound sign). Routines that search the
networks file do not interpret characters from the beginning of a
comment to the end of that line. Network numbers are specified in
dotted-decimal notation. A network name can contain any printable
character except a field delimiter, new-line character, or comment
The networks file is normally created from the official network
database maintained at the Network Information Center (NIC). The file
can be modified locally to include unofficial aliases or unknown
networks.This file is part of TCP/IP in Network Support Facilities.
Edit: So they are the same interface, the same route, the same network
en0 65390 link#2 e2.f9.3a.a8.fc.2 1205 0 71 0 0
en0 65390 10.140.128 nix-aix71-vs02-v 1205 0 71 0 0