Instructions to allow entire IP Block

[netprophet]

I travel a lot and find myself at a location where the IP address allocated to me changes every few minutes/hours. I am struggling to enter the correct instructions in the WHM/CPanel firewall to allow an entire block of IP addresses. I would like to allow all IP addresses at :-
98.186.XXX.XX
&
172.56.xxx.xxx

How can I do this?
regards