What is Windows command to convert machine name to ip address and vice versa?

A machine with machine name "accounting" and ip "192.168.1.95"

IP -> Machine Name:

tracert 192.168.1.95

or

NBTSTAT  -a 192.168.1.95

Machine Name -> IP

nslookup accounting

or

ping accounting

in window 7 and later versions. to find ipv4 ip by hostname you can try following methods.

For ipv4 (192.168.1.2):

ping hostname -4

For ipv6 (0000:0000:0000:0000:0000):

ping hostname -6