public ip addresses

Hi, correct if I’m
wrong but on a home network with just a few pcs and laptop that uses a small router/ modem there is usually one public Ip address and the router split/shares the internet and acts like a DHCP server and assigns private Ip addresses to all the devices. On a large corporate network, one that spans to several building or across a city, etc. does it work that same way. One public Ip address and several private Ip addresses or do they usually have several public Ip addresses.