I had a requirement to view detailed network information for all host NICs under a vCenter server. The following command generates the required information (including MTU, IP and MAC addresses) and exports this to a .CSV file;
Get-VMHostNetworkAdapter | select VMhost, Name, IP, SubnetMask, Mac, PortGroupName, vMotionEnabled, mtu, FullDuplex, BitRatePerSec | Export-Csv C:\VMHostNetworkDetails.csv