By default, ESXi is configured to receive the IP address for the management console through the Dynamic Host Configuration Protocol (DHCP). If no DHCP server is present in your network, the hypervisor doesn't obtain an IP, and you won't be able to connect.
Assigning a dynamic IP address to ESXi is not a recommended configuration because management and services are linked to specific IP addresses assigned to the server. If the IP changes (after rebooting the host or for an expired lease), some services may not work as expected. If the server has multiple physical network interface controllers (NICs) installed and the DHCP assigns an IP address to an NIC linked to a wrong vSwitch, you may experience connectivity ...