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

Practice mode

No timer. Shows the worked solution after every question.

s s : skip the current question

Tap Skip to skip the current question

Tap End to end the session early

Shift + Q : end the session early

Press Enter to continue

Session complete