Free Networking Tools
The networking math, handled. These free tools calculate subnets and CIDR ranges, work with IP addresses, generate MAC addresses and give you a handy port reference — all in your browser.
Subnet Calculator
Calculate subnet details from an IP and CIDR.
CIDR Calculator
Convert CIDR notation to an IP range and netmask.
MAC Address Generator
Generate random MAC addresses in any format.
Network Port Reference Guide
Search common TCP/UDP ports and their services.
IP Subnet Calculator
Work out network, broadcast and host range from an IP.
IPv4 Converter
Convert IPv4 between decimal, integer, binary and hex.
IPv6 Expander & Compressor
Expand or compress any IPv6 address.
DNS Record Generator
Produce correctly formatted DNS zone records.
Wildcard Mask Calculator
Convert between subnet and wildcard masks.
Networking tools — questions
Are these networking tools free?
Yes — free, no signup, and they run locally in your browser.