I asked:
I see i can buy maximum 4 additional IPv4, i want to ask if this is an subnet with gateway IP as i think i need subnet.

They answered:
"This datacenter do not offer dedicated VLAN for IP blocks so IPs comes without dedicated subnet"

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So does it mean that IP subnet is in another words "dedicated VLAN"?

By subnet im meaning set of IP addresses which i can assign to an virtual private servers within my physical server. Then these virtual servers IPs will be accessible from internet.