It depends on subnet mask that was used to append your IP addresses. Some examples below to shad some light on syntax.

Ex 1.

ip a |grep global

inet xx.xx.150.114/29 brd xx.xx.150.119 scope global eth0
inet xx.xx.150.115/29 brd xx.xx.150.119 scope global secondary eth0:0
inet xx.xx.150.116/29 brd xx.xx.150.119 scope global secondary eth0:1
inet xx.xx.150.117/29 brd xx.xx.150.119 scope global secondary eth0:2
inet xx.xx.150.118/29 brd xx.xx.150.119 scope global secondary eth0:3

Then /etc/ips should be looking as the following:

xx.xx.150.114:255.255.255.248:xx.xx.150.119
xx.xx.150.115:255.255.255.248:xx.xx.150.119
xx.xx.150.116:255.255.255.248:xx.xx.150.119
xx.xx.150.117:255.255.255.248:xx.xx.150.119
xx.xx.150.118:255.255.255.248:xx.xx.150.119

Ex 2.

ip a |grep global

inet xx.xx.121.250/32 brd xx.xx.121.250 scope global vlan3009:cp50
inet xx.xx.121.251/32 brd xx.xx.121.251 scope global vlan3009:cp51
inet xx.xx.121.252/32 brd xx.xx.121.252 scope global vlan3009:cp52
inet xx.xx.121.253/32 brd xx.xx.121.253 scope global vlan3009:cp53
inet xx.xx.121.254/32 brd xx.xx.121.254 scope global vlan3009:cp54

The /etc/ips should be looking as the following

xx.xx.121.250:255.255.255.255:xx.xx.121.250
xx.xx.121.251:255.255.255.255:xx.xx.121.251
xx.xx.121.252:255.255.255.255:xx.xx.121.252
xx.xx.121.253:255.255.255.255:xx.xx.121.253
xx.xx.121.254:255.255.255.255:xx.xx.121.254

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