iptables 1.8.3-2ubuntu5 (s390x binary) in ubuntu focal

 The iptables/xtables framework has been replaced by nftables. You should
 consider migrating now.
 .
 iptables is the userspace command line program used to configure
 the Linux packet filtering and NAT ruleset. It is targeted towards systems
 and networks administrators.
 .
 This package contains several different utilities, the most important ones:
 .
 iptables, iptables-save, iptables-restore (nft-based version)
 .
 iptables, iptables-save, iptables-restore (legacy version)
 .
 ip6tables, ip6tables-save, ip6tables-restore (nft-based version)
 .
 ip6tables, ip6tables-save, ip6tables-restore (legacy version)
 .
 arptables, arptables-save, arptables-restore (nft-based version)
 .
 ebtables, ebtables-save, ebtables-restore (nft-based version)