root@proxmox:/# apt search iptables | grep installed
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
ebtables/stable,now 2.0.11-4+b1 amd64 [installed]
fail2ban/stable,now 0.11.2-2 all [installed]
ipset/stable,now 7.10-1 amd64 [installed]
iptables/stable,now...