I am not a Networking expert and I have been assigned to setup a system at work for other purposes which will require networking components.
I have a 3 Hosts and each host will be connected to 7 target clients.
These clients will always be changing hence I can’t use their MAC addresses. After quite a bit of research, I have determined that I need a 24-port 100MBit managed Layer3 switch but the details and the setup is what I am concerned with. Let me give a bit of detail for my application, all 3 Hosts will be running the same program and will talk to the target client via this IP formula= 192.168.HOST#.Target#.
Essentially, If I connect all 3 hosts on ports 22,23 & 24, then the targets & the port/IP assigments should be as follows:

Host1(IP:192.168.1.0)->Targets1-7->Ports1-7(IP:192.168.1.1-7)
Host2(IP:192.168.2.0)->Targets8-14->Ports8-14(IP:192.168.2.1-7)
Host3(IP:192.168.3.0)->Targets15-21->Ports15-21(IP:192.168.3.1-7).

I obviously need a DHCP server capabilities and I am not sure if switches come with a built-in DHCP server. I think I need to set this up using VLANs, Trunking & limiting the IP-assignment.

Any help would be very much appreciated & thanks in adanced.
Also, any model/brand recommendations would be helpful as well.

NTnewbie