Free tools

Free Networking Tools

Practical calculators and converters for subnetting, VLSM, Cisco wildcard masks, IP number systems, and MAC vendor lookup — all running locally in your browser.

Subnet Calculator

Calculate subnet mask, network address, broadcast address, and usable host range instantly. Free, browser-based subnet calculator built for CCNA and Network+ students.

Open tool

VLSM Calculator

Design efficient IP address schemes with our free VLSM calculator. Enter your host requirements and get correctly sized subnets instantly — built for CCNA students.

Open tool

Wildcard Mask

Convert a subnet mask to its wildcard mask instantly, or go the other way. Free tool for Cisco ACLs, OSPF network statements, and CCNA practice.

Open tool

IP Converter

Convert any IPv4 address between decimal, binary, and hexadecimal instantly. Free browser-based tool for subnetting practice and networking students.

Open tool

MAC Lookup

Look up the manufacturer of any device from its MAC address. Free, instant OUI lookup tool — useful for network troubleshooting and security audits.

Open tool