iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4
nft 'add rule ip nat postrouting oifname "eth0" counter snat to 1.2.3.4'

iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4-1.2.3.6
nft 'add rule ip nat postrouting oifname "eth0" counter snat to 1.2.3.4-1.2.3.6'

iptables-translate -t nat -A postrouting -p tcp -o eth0 -j SNAT --to 1.2.3.4:1-1023
nft 'add rule ip nat postrouting oifname "eth0" ip protocol tcp counter snat to 1.2.3.4:1-1023'

iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4 --random
nft 'add rule ip nat postrouting oifname "eth0" counter snat to 1.2.3.4 random'

iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4 --random --persistent
nft 'add rule ip nat postrouting oifname "eth0" counter snat to 1.2.3.4 random,persistent'