We just signed up with a new ISP and we got a static IP from them.

Our previous ISP just gave one IP and we were able to configure our web server using that. Now, we have got this new IP with a slash notation. This type is new to me. When I used the CIDR calculator, it gave me the following results:

    202.184.7.52/30
    IP: 202.184.7.52
    Netmask: 255.255.255.252
    Number of hosts: 2
    Network address: 202.184.7.52
    Broadcast address: 202.184.7.55

Can someone please help me by explaining what these are? I could not understand what the number of hosts means. Is that telling that I can use two different IP for DNS (A) records? Also, which one should I setup in my router? The network address or broadcast address?

Thank you very much for any answer you may provide.