Subnetting Drill

A timed drill for IPv4 subnetting math.
Do as many as possible within a fixed time.

Network address▾
Find the network address, the first address in that subnet.
Broadcast address▾
Find the broadcast address, the last address in that subnet.
First/last usable host▾
Find the first and last usable host addresses in that subnet.
Usable host count▾
Find how many usable host addresses that subnet has.
Subnet mask▾
Write the subnet mask in dotted decimal.
Same subnet?▾
Decide whether two IP addresses fall in the same subnet.
Duration:
Prefix range: From to
No timer. Shows the worked solution after every question.

s s : skip the current question

Shift + Q : end the session early