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 communications protocol used for discovering the link layer address associated with a given IPv4 address, a critical function in Internet Protocol (IP) computer networks. ARP was defined in 1982 by RFC 826, which is Internet Standard STD 37.
ARP is used for mapping a network address (e.g. an IPv4 address) to a physical address like a MAC address. ARP has been implemented with many combinations of network and data link …