way1: re-run "smit mktcpip" and fill the correct values.
way2: command line
chdev -l en0 -a netmask="255.255.0.0"
then check routing table (netstat -rn) and correct it if needed.
You can flush the routing table (route -fn) then rebuild it using cfgmgr (after that check default route).
Both ways use local console or any other network interface for your tty, as the connection might hang.
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