Network IP Diagnostics & Subnet Calculator
Inspect public IP details, calculate IPv4 CIDR subnet masks (usable IP ranges, network broadcast addresses, wildcard masks), and convert IP addresses.
Key Features
- Public IP address detector with location ISP details
- IPv4 Subnet Calculator (CIDR notation /24, /16, usable host ranges)
- IP address binary, hexadecimal, and decimal converters
- Port and protocol reference lookup table
- 100% free tool for network engineers and IT students
How to Use My Public IP & Browser Network Diagnostics
- View your detected public IP address and ISP details.
- Enter an IPv4 address and CIDR prefix (e.g. 192.168.1.1/24) in the Subnet tab.
- View network address, broadcast address, netmask, and total host capacity.
Frequently Asked Questions
What is CIDR notation in IP subnets?
CIDR (Classless Inter-Domain Routing) notation uses a slash suffix (e.g. /24) to represent the number of network bits in an IP subnet mask.
How many usable IP hosts are available in a /24 subnet?
A /24 subnet has 256 total IP addresses, yielding 254 usable host IP addresses (excluding network and broadcast IPs).
Is my local IP address exposed to external servers?
No, calculations are performed client-side inside your browser.
Is this network tool free?
Yes, 100% free with no registration.