Network Tools
Network tools
Calculators work it out in your browser. Lookups and checks run on the RouteLearn server, because a web page can't query DNS or test a remote port by itself. Each tool explains its result and links to the lesson behind it.
Most used
- IPv4 Subnet CalculatorWork out the network address, broadcast address, and usable host range.
- VLSM CalculatorPlan different-sized subnets across one network.
- What Is My IPSee your public IP address right now.
- DNS LookupLook up any DNS record for a domain name.
- Port CheckerCheck if a port is open on a host.
- SSL Certificate CheckerCheck if a website's SSL certificate is valid, and when it expires.
IP Tools
Runs on the RouteLearn serverLook up, convert, and check IP addresses.
- What Is My IPSee your public IP address right now.
- Website to IPFind the IP address behind a website name.
- IP LookupSee who owns an IP address, its network, country and hostname.
- IP Blacklist CheckCheck if an IPv4 address is on spam blocklists.
- WHOIS LookupFull WHOIS record for any domain or IP address.
Subnet Tools
Runs in your browserEasy calculators for subnetting, CIDR, and VLSM.
- IPv4 Subnet CalculatorWork out the network address, broadcast address, and usable host range.
- IPv6 Subnet CalculatorNetwork, range and subnets for any IPv6 prefix, plus compress and expand.
- CIDR CalculatorSwitch between CIDR notation and subnet masks.
- VLSM CalculatorPlan different-sized subnets across one network.
- Wildcard Mask CalculatorTurn a subnet mask into its wildcard mask.
- Subnetting PracticeUnlimited subnetting drills with worked solutions.
DNS Tools
Runs on the RouteLearn serverLook up DNS records and see how fast changes spread.
Network Tools
Runs on the RouteLearn serverFind and fix connection problems.
Security Tools
Runs on the RouteLearn serverCheck certificates, email security, and headers.
- SSL Certificate CheckerCheck if a website's SSL certificate is valid, and when it expires.
- SPF CheckerCheck a domain's SPF record, which helps stop fake emails.
- DMARC CheckerCheck a domain's DMARC record, which helps block email spoofing.
- Security Headers CheckerCheck the security headers a website is using.
Calculators
Runs in your browserBandwidth, transfer time, and other networking math.