Free tools and calculators to check, fix, and understand your network — plus simple lessons to learn how it all works. Made for network engineers, sysadmins, and IT students.
Every tool and every lesson is free. No account, no payment, no trial period.
Every tool is here because it solved a real problem — not just a random list of utilities.
Every tool links to a simple explanation of what it does and why it matters.
Tools
Calculators and live checks that run in your browser or on the RouteLearn servers. No sign-up, no limits for normal use.
Look up, convert, and check IP addresses.
5 tools
Explore →Easy calculators for subnetting, CIDR, and VLSM.
6 tools
Explore →Look up DNS records and see how fast changes spread.
4 tools
Explore →Find and fix connection problems.
4 tools
Explore →Check certificates, email security, and headers.
4 tools
Explore →Bandwidth, transfer time, and other networking math.
3 tools
Explore →Work out the network address, broadcast address, and usable host range.
See your public IP address right now.
Look up any DNS record for a domain name.
Check if a port is open on a host.
Switch between bandwidth units and work out real speed.
Switch between CIDR notation and subnet masks.
Learn
Two free courses with diagrams, real commands and quizzes. Start with the fundamentals, then move on to CCNA.