If you mean you want to create an address object containing all public IP addresses then you need to create an address group containing the following ranges:
config firewall address edit "publicIP_part_1" set allow-routing enable set subnet 0.0.0.0/5 next edit "publicIP_part_2" set allow-routing enable set subnet 8.0.0.0/7 next edit "publicIP_part_3" set allow-routing enable set subnet 11.0.0.0/8 next edit "publicIP_part_4" set allow-routing enable set subnet 12.0.0.0/6 next edit "publicIP_part_5" set allow-routing enable set subnet 16.0.0.0/4 next edit "publicIP_part_6" set allow-routing enable set subnet 32.0.0.0/3 next edit "publicIP_part_7" set allow-routing enable set subnet 64.0.0.0/3 next edit "publicIP_part_8" set allow-routing enable set subnet 96.0.0.0/6 next edit "publicIP_part_9" set allow-routing enable set subnet 100.0.0.0/10 next edit "publicIP_part_10" set allow-routing enable set subnet 100.128.0.0/9 next edit "publicIP_part_11" set allow-routing enable set subnet 101.0.0.0/8 next edit "publicIP_part_12" set allow-routing enable set subnet 102.0.0.0/7 next edit "publicIP_part_13" set allow-routing enable set subnet 104.0.0.0/5 next edit "publicIP_part_14" set allow-routing enable set subnet 112.0.0.0/5 next edit "publicIP_part_15" set allow-routing enable set subnet 120.0.0.0/6 next edit "publicIP_part_16" set allow-routing enable set subnet 124.0.0.0/7 next edit "publicIP_part_17" set allow-routing enable set subnet 126.0.0.0/8 next edit "publicIP_part_18" set allow-routing enable set subnet 128.0.0.0/3 next edit "publicIP_part_19" set allow-routing enable set subnet 160.0.0.0/5 next edit "publicIP_part_20" set allow-routing enable set subnet 168.0.0.0/6 next edit "publicIP_part_21" set allow-routing enable set subnet 168.0.0.0/8 next edit "publicIP_part_22" set allow-routing enable set subnet 169.0.0.0/9 next edit "publicIP_part_23" set allow-routing enable set subnet 169.128.0.0/10 next edit "publicIP_part_24" set allow-routing enable set subnet 169.192.0.0/11 next edit "publicIP_part_25" set allow-routing enable set subnet 169.224.0.0/12 next edit "publicIP_part_26" set allow-routing enable set subnet 169.240.0.0/13 next edit "publicIP_part_27" set allow-routing enable set subnet 169.248.0.0/14 next edit "publicIP_part_28" set allow-routing enable set subnet 169.252.0.0/15 next edit "publicIP_part_29" set allow-routing enable set subnet 172.0.0.0/12 next edit "publicIP_part_30" set allow-routing enable set subnet 172.32.0.0/11 next edit "publicIP_part_31" set allow-routing enable set subnet 172.64.0.0/10 next edit "publicIP_part_32" set allow-routing enable set subnet 172.128.0.0/9 next edit "publicIP_part_33" set allow-routing enable set subnet 173.0.0.0/8 next edit "publicIP_part_34" set allow-routing enable set subnet 174.0.0.0/7 next edit "publicIP_part_35" set allow-routing enable set subnet 176.0.0.0/4 next edit "publicIP_part_36" set allow-routing enable set subnet 192.0.0.0/9 next edit "publicIP_part_37" set allow-routing enable set subnet 192.128.0.0/11 next edit "publicIP_part_38" set allow-routing enable set subnet 192.160.0.0/13 next edit "publicIP_part_39" set allow-routing enable set subnet 192.169.0.0/16 next edit "publicIP_part_40" set allow-routing enable set subnet 192.170.0.0/15 next edit "publicIP_part_41" set allow-routing enable set subnet 192.172.0.0/14 next edit "publicIP_part_42" set allow-routing enable set subnet 192.176.0.0/12 next edit "publicIP_part_43" set allow-routing enable set subnet 192.192.0.0/10 next edit "publicIP_part_44" set allow-routing enable set subnet 193.0.0.0/8 next edit "publicIP_part_45" set allow-routing enable set subnet 194.0.0.0/7 next edit "publicIP_part_46" set allow-routing enable set subnet 196.0.0.0/6 next edit "publicIP_part_47" set allow-routing enable set subnet 200.0.0.0/5 next edit "publicIP_part_48" set allow-routing enable set subnet 208.0.0.0/4 next edit "publicIP_part_49" set allow-routing enable set subnet 224.0.0.0/4 next edit "publicIP_part_50" set allow-routing enable set subnet 240.0.0.0/4 next end config firewall addrgrp edit "publicIPs" append member "publicIP_part_1" append member "publicIP_part_2" append member "publicIP_part_3" append member "publicIP_part_4" append member "publicIP_part_5" append member "publicIP_part_6" append member "publicIP_part_7" append member "publicIP_part_8" append member "publicIP_part_9" append member "publicIP_part_10" append member "publicIP_part_11" append member "publicIP_part_12" append member "publicIP_part_13" append member "publicIP_part_14" append member "publicIP_part_15" append member "publicIP_part_16" append member "publicIP_part_17" append member "publicIP_part_18" append member "publicIP_part_19" append member "publicIP_part_20" append member "publicIP_part_21" append member "publicIP_part_22" append member "publicIP_part_23" append member "publicIP_part_24" append member "publicIP_part_25" append member "publicIP_part_26" append member "publicIP_part_27" append member "publicIP_part_28" append member "publicIP_part_29" append member "publicIP_part_30" append member "publicIP_part_31" append member "publicIP_part_32" append member "publicIP_part_33" append member "publicIP_part_34" append member "publicIP_part_35" append member "publicIP_part_36" append member "publicIP_part_37" append member "publicIP_part_38" append member "publicIP_part_39" append member "publicIP_part_40" append member "publicIP_part_41" append member "publicIP_part_42" append member "publicIP_part_43" append member "publicIP_part_44" append member "publicIP_part_45" append member "publicIP_part_46" append member "publicIP_part_47" append member "publicIP_part_48" append member "publicIP_part_49" append member "publicIP_part_50" next end