Subnetting Practice for IT Students

Check your subnetting homework and CCNA practice problems instantly.

Ez da saioa hasi behar

IPv4 address

Prefix

/0/8/16/24/32

254

Usable hosts

256

Total addresses

Network address192.168.1.0/24

Usable host range192.168.1.1 – 192.168.1.254

Broadcast address192.168.1.255

Subnet mask255.255.255.0

Wildcard mask0.0.0.255

Mask (binary)11111111.11111111.11111111.00000000

IP classC

Address typePrivate (RFC 1918)

IPv4 subnetting reference. /31 and /32 are handled per RFC 3021 (point-to-point and single-host). All math runs locally in your browser.

IT Students tips

🎓

Studying for CCNA / Network+? Work the problem by hand, then verify network, broadcast, and host range here.

💡

The binary mask and wildcard mask help connect the dot-decimal notation to what's happening bit-by-bit.

🎯

Practice the /25, /26, /27, /28 boundaries — these are the most common exam questions.

Nola Funtzionatzen Du

Sartu

Enter your data into the tool above. Everything stays local to your browser.

Prozesua

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Deskargatu

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

Zergatik erabili gurea?

✓Erabat doakoa, ezkutuko kosturik, inoiz

✓Ez da konturik, posta elektronikorik edo saioa hasteko beharrik

✓Fitxategiak ez dira inoiz zure gailutik irteten

✓Ez dago fitxategien tamaina mugarik

✓Ez dago ur-markarik edozein irteeratan

Also check out…

🖧

Subnet Planning for Network Admins

Plan IP allocation, calculate usable hosts, and si

🏠

Home Lab & Self-Hosting Subnets

Plan IP ranges for your home network, VLANs, Docke

☁️

Plan Cloud VPC CIDR Blocks

Size AWS/GCP/Azure VPC and subnet CIDR ranges befo

🛡️

CIDR Ranges for Firewall Rules

Convert IP ranges to CIDR notation for firewall al

Maiz egiten diren galderak

Back to Subnet / CIDR Calculator