IPTables IPset List Creation Blocking Usage

You can use the following commands.
!/usr/bin/env bash
## apt install ipset -y

ipset -N my_test_list iphash
ipset -A my_test_list 5.252.204.226/29
iptables -A INPUT -m set --match-set my_test_list src -j DROP

ipset -A my_test_list 5.252.204.226

## delete ipset list
ipset -X mytest_list

## Save permanently
ipset save > /etc/ipset.conf

To clear all conditions:
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -t filter -F
iptables -t raw -F
iptables -t nat -F
iptables -t mangle -F
ipset -F
ipset -X