Netstat will show open connections by IP and port. Nslookup will resolve domains to IP addresses (DNS). Ipconfig /all will show you the default gateway and your MAC addresses but not the MAC of another network device. arp -a will show the Address Resolution Protocol (ARP) table, which will include the ARP for your default gateway.
The Address Resolution Protocol (ARP) is a communication protocol used for discovering the link layer address associated with a given IPv4 address, a critical function in the Internet protocol suite. ARP was defined in 1982 by RFC 826, which is Internet Standard STD 37.
ARP is used for mapping a network address such as an IPv4 address, to a physical address, such as a MAC address. ARP has been implemented with many combinations of network and data …