For example you have been assigned :

54.39.92.191

and

54.39.92.189

Here is ip a readout:

root@contractout:/var/lib/vz/template/iso# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group defaul                                                                                                                                                                                                                                             t qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: eno3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state                                                                                                                                                                                                                                              UP group default qlen 1000
    link/ether 0c:c4:7a:c8:76:ae brd ff:ff:ff:ff:ff:ff
    altname enp3s0f0
3: eno4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen                                                                                                                                                                                                                                              1000
    link/ether 0c:c4:7a:c8:76:af brd ff:ff:ff:ff:ff:ff
    altname enp3s0f1
4: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP grou                                                                                                                                                                                                                                             p default qlen 1000
    link/ether 0c:c4:7a:c8:76:ae brd ff:ff:ff:ff:ff:ff
    inet 142.44.212.192/24 scope global vmbr0
       valid_lft forever preferred_lft forever
5: tap100i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast                                                                                                                                                                                                                                              master fwbr100i0 state UNKNOWN group default qlen 1000
    link/ether 2e:71:17:63:af:19 brd ff:ff:ff:ff:ff:ff
6: fwbr100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP                                                                                                                                                                                                                                              group default qlen 1000
    link/ether 5a:40:8e:1b:8a:e7 brd ff:ff:ff:ff:ff:ff
7: fwpr100p0@fwln100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue                                                                                                                                                                                                                                              master vmbr0 state UP group default qlen 1000
    link/ether be:6d:0e:18:91:8d brd ff:ff:ff:ff:ff:ff
8: fwln100i0@fwpr100p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue                                                                                                                                                                                                                                              master fwbr100i0 state UP group default qlen 1000
    link/ether 5a:40:8e:1b:8a:e7 brd ff:ff:ff:ff:ff:ff
root@contractout:/var/lib/vz/template/iso# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: eno3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UP group default qlen 1000
    link/ether 0c:c4:7a:c8:76:ae brd ff:ff:ff:ff:ff:ff
    altname enp3s0f0
3: eno4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 0c:c4:7a:c8:76:af brd ff:ff:ff:ff:ff:ff
    altname enp3s0f1
4: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 0c:c4:7a:c8:76:ae brd ff:ff:ff:ff:ff:ff
    inet 142.44.212.192/24 scope global vmbr0
       valid_lft forever preferred_lft forever
5: tap100i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master fwbr100i0 state UNKNOWN group default qlen 1000
    link/ether 2e:71:17:63:af:19 brd ff:ff:ff:ff:ff:ff
6: fwbr100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 5a:40:8e:1b:8a:e7 brd ff:ff:ff:ff:ff:ff
7: fwpr100p0@fwln100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
    link/ether be:6d:0e:18:91:8d brd ff:ff:ff:ff:ff:ff
8: fwln100i0@fwpr100p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr100i0 state UP group default qlen 1000
    link/ether 5a:40:8e:1b:8a:e7 brd ff:ff:ff:ff:ff:ff

Next you need to :

sudo nano /etc/network/interfaces

1. Add the new IP addresses: Add the new IP addresses to the vmbr0 interface. Your configuration should look something like this:

auto lo
iface lo inet loopback

iface eno3 inet manual

auto vmbr0
iface vmbr0 inet static
    address 142.44.212.192/24
    gateway 142.44.212.254
    bridge-ports eno3
    bridge-stp off
    bridge-fd 0
    hwaddress 0C:C4:7A:C8:76:AE

iface vmbr0 inet6 static
    address 2607:5300:203:25c0::1/128
    gateway 2607:5300:203:25ff:ff:ff:ff:ff

# Add the new IP addresses here
up ip addr add 54.39.92.191/24 dev vmbr0
up ip addr add 54.39.92.189/24 dev vmbr0

ave and exit: Save the file and exit the text editor (in nano, you can do this by pressing Ctrl+X, then Y, and Enter).

Restart the networking service: Restart the networking service to apply the changes:

sudo systemctl restart networking

Verify the new IP addresses: Check if the new IP addresses have been added successfully:

ip addr show vmbr0

This should add the two new IP addresses to your vmbr0 interface.