The Subnet Calculator Every Network Engineer Actually Wants

If you work in networking, you know the pain of calculating subnets by hand. Or using three different websites that are all covered in ads.

I built a clean subnet calculator that just works:

Features

• Enter any IP + CIDR prefix (slider from /0 to /32)
• Instantly see: network address, broadcast, first/last host, total hosts, usable hosts
• Subnet mask + wildcard mask in decimal and binary
• IP class detection (A/B/C/D/E)
• Private vs public IP detection
• Reference table with all common CIDR blocks
• Copy any value with one click

Quick Example

192.168.1.0/24:

• Network: 192.168.1.0
• Broadcast: 192.168.1.255
• Usable hosts: 254
• Mask: 255.255.255.0
• Wildcard: 0.0.0.255

Try the Subnet Calculator

No ads. No signup. Runs in your browser.

Also useful:

• DNS Lookup — Query any record type
• WHOIS — Domain registration info
• SSL Checker — Certificate verification

Full toolkit: devtools-site-delta.vercel.app