100% free · runs in your browser
Free tools for network & security people
Calculate, convert, generate and look things up in seconds. Every tool runs on your own device, and nothing you type is uploaded.
Network calculators
Subnet calculatorNetwork, broadcast, host range, wildcard and binary for any IPv4 address.VLSM plannerSplit one network into right-sized subnets for each team or link.Wildcard mask calculatorConvert a prefix or subnet mask to the wildcard mask used in ACLs and OSPF.IPv4 converterConvert an IPv4 address to binary, hexadecimal and a 32-bit number, and back.IPv6 expand & compressShow the full and shortest forms of any IPv6 address, and its type.Download time calculatorHow long a file takes to transfer at a given connection speed.CIDR / supernet calculatorCombine contiguous networks into one summary route to keep routing tables small.VoIP bandwidth calculatorBandwidth needed for a number of simultaneous calls with G.711, G.729 and other codecs.PoE power budget calculatorPower loss, voltage drop and switch budget for PoE devices by cable type and distance.Switch config generatorBuild a secure Cisco access-switch configuration: VLANs, access and trunk ports, SSH and Spanning Tree protection.ACL builderCreate a Cisco extended access list from simple rules, with wildcard masks worked out for you.
Security tools
Hash calculatorMD5, SHA-1, SHA-2, SHA-3, RIPEMD-160 and CRC32 for text, hex or files, with HMAC and verify.Password generatorCreate strong random passwords. Generated on your device, never sent anywhere.Password strength checkerSee how strong a password is, how long it would take to crack, and how to improve it. Checked only on your device.Encryption & decryption toolEncrypt or decrypt text locally with AES-256, AES-128, Triple DES or DES.TOTP / 2FA code simulatorGenerate time-based one-time codes, like an authenticator app, from a secret.Is this link safe? checkerCheck a suspicious link for common phishing warning signs, without opening it.
Reference & converters
Base64 encode & decodeEncode text to Base64 or decode Base64 back to text.Common port lookupSearch well-known TCP and UDP port numbers and the services that use them.MAC address formatterConvert a MAC address between formats, see what kind of address it is and look up the manufacturer (OUI).URL encoder & decoderEncode or decode URLs and query strings, and split a URL into its parts.Hex & ASCII converterConvert text to hexadecimal bytes and hex back to readable text.
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Coming soon
- CV builder for IT roles
- Interview question bank
- Study timetable planner
- Firewall rule builder
- DNS record explainer