Plan Cloud VPC CIDR Blocks

Size AWS/GCP/Azure VPC and subnet CIDR ranges before you provision.

Hakuna kuingia kinachohitajika

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.

Cloud VPC tips

☁️

AWS VPCs accept /16 to /28. Plan your VPC CIDR and per-subnet CIDRs here before running Terraform — resizing later is painful.

💡

Cloud providers reserve ~5 addresses per subnet (not just 2), so subtract a little more from the usable count for AWS/Azure.

🎯

Leave room between subnet ranges for future expansion; don't pack /24s back-to-back if you might need to grow one.

Jinsi Inavyofanya Kazi

Ingiza

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

Chakata

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

Pakua

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

Kwa nini utumie yetu?

✓Bure kabisa — bila gharama zilizofichwa, kamwe

✓Hakuna akaunti, barua pepe, au kuingia kinachohitajika

✓Faili hazitoki kwenye kifaa chako kamwe

✓Hakuna kikwazo cha ukubwa wa faili kabisa

✓Hakuna alama za maji kwenye matokeo yoyote

Also check out…

🖧

Subnet Planning for Network Admins

Plan IP allocation, calculate usable hosts, and si

🎓

Subnetting Practice for IT Students

Check your subnetting homework and CCNA practice p

🏠

Home Lab & Self-Hosting Subnets

Plan IP ranges for your home network, VLANs, Docke

🛡️

CIDR Ranges for Firewall Rules

Convert IP ranges to CIDR notation for firewall al

Maswali Yanayoulizwa Mara Kwa Mara

Back to Subnet / CIDR Calculator