Networking & IT Tools
Subnet calculators, IP tools, and lookup references for everyday networking and sysadmin tasks.
- Subnet Calculator
Calculate network address, broadcast address, and host range from an IP and CIDR prefix. Free, instant.
- IP Validator
Check if an IP address is valid IPv4 or IPv6, and see its type. Free, instant.
- MAC Generator
Generate random, locally-administered MAC addresses for testing. Free, instant.
- CIDR to Subnet Mask
Convert between CIDR notation and dotted-decimal subnet masks. Free, instant.
- Port Lookup
Look up common well-known port numbers and their services. Free, instant.
- Binary IP Converter
Convert an IPv4 address between decimal and binary notation. Free, instant.
- Wildcard Mask Calculator
Calculate the wildcard mask (inverse subnet mask) from a CIDR prefix. Free, instant.
- Download Time Calculator
Estimate download or transfer time from file size and connection speed. Free, instant.