If you do not want to create new interfaces, just new IP addresses, use these commands:
ip addr add 33.33.33.38/28 brd + dev eth0
ip addr add 33.33.33.39/28 brd + dev eth0
ip addr add 33.33.33.40/28 brd + dev eth0
# Replace the IP addresses and subnet masks as you desire.
The IP addresses will go away upon rebooting. You may want multiple IP addresses on new “semi-virtual” interfaces on a Linux server.
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