Network engineering toolkit
48 tools for subnetting, addressing, config and diagnostics
36 of the 48 run offline and never leave your browser. The other 12 query DNS, TLS, WHOIS or vendor lookups, and each one names the host it contacts before it sends.
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48 of 48 tools shown
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The ones people open first14Subnet CalculatorCalculate network addresses, broadcast addresses, and host ranges for IPv4 and IPv6CalculatorsVLSM PlannerPlan Variable Length Subnet Masking with optimal allocation and minimal wasteCalculatorsBandwidth CalculatorCalculate transfer times, throughput, and bandwidth requirementsCalculatorsCable CalculatorCalculate signal loss for fiber optic and copper cables with TIA standards complianceCalculatorsRouting ToolsConfigure OSPF, EIGRP, static routes, and administrative distancesNetwork ConfigWireless ToolsChannel planning, interference analysis, and WiFi configurationNetwork ConfigNetwork TesterTest RTT, throughput, and connectivity to user-defined endpointsDiagnosticsSends dataPing & TracerouteTest network connectivity and trace packet paths to destinationsDiagnosticsSends dataWiFi QR GeneratorGenerate QR codes for instant WiFi connection on smartphonesGeneratorsSecurity Headers CheckerAnalyze HTTP security headers and get recommendationsDiagnosticsSends dataHash GeneratorGenerate and verify cryptographic hashes (SHA-256, SHA-384, SHA-512, SHA-1)Dev ToolsPassword GeneratorGenerate cryptographically secure random passwordsDev ToolsJSON FormatterFormat, validate, and minify JSON dataDev ToolsRegex TesterTest and debug regular expressions with live highlightingDev Tools
Calculators
Network calculation tools8Subnet CalculatorCalculate network addresses, broadcast addresses, and host ranges for IPv4 and IPv6VLSM PlannerPlan Variable Length Subnet Masking with optimal allocation and minimal wasteMTU CalculatorCalculate MTU and header overhead for various network stacksBandwidth CalculatorCalculate transfer times, throughput, and bandwidth requirementsCable CalculatorCalculate signal loss for fiber optic and copper cables with TIA standards complianceData Unit ConverterConvert between bits, bytes, and all data size units (SI and IEC)Uptime/SLA CalculatorCalculate allowed downtime based on SLA uptime percentageNetwork CalculatorCalculate latency, throughput (BDP), and perform IP math operations
IP Tools
IP address manipulation and conversion6IP Address ConverterConvert IPv4 addresses between binary, decimal, hexadecimal, and dotted-decimal formatsIP Range EnumeratorList all IP addresses within a CIDR block with network detailsIPv6 ToolsIPv6 address manipulation, compression, and EUI-64 generationIP Conflict CheckerDetect IP and MAC conflicts from ARP tables, DHCP leases, and inventoriesSends dataMAC Address FormatterConvert MAC addresses between formats and analyze propertiesSubnet Mask ConverterConvert between CIDR notation, dotted decimal, and wildcard masks
Network Config
Network configuration generators4VLAN ManagerDesign and manage VLANs with switch configuration templatesRouting ToolsConfigure OSPF, EIGRP, static routes, and administrative distancesACL GeneratorGenerate standard and extended access control lists with validationWireless ToolsChannel planning, interference analysis, and WiFi configuration
Diagnostics
Network testing and diagnostics11Network TesterTest RTT, throughput, and connectivity to user-defined endpointsSends dataDNS ToolsDNS over HTTPS client with multiple provider support and cachingSends dataPing & TracerouteTest network connectivity and trace packet paths to destinationsSends dataPort ScannerScan network hosts for open ports and running servicesSends dataSSL/TLS CheckerAnalyze SSL certificates, expiry dates, and TLS configurationSends dataWHOIS LookupLook up domain registration and IP block ownership informationSends dataEmail DiagnosticsCheck MX records, SPF, DKIM, and DMARC configurationsSends dataHTTP Headers AnalyzerAnalyze HTTP response headers and security configurationSends dataSecurity Headers CheckerAnalyze HTTP security headers and get recommendationsSends dataRedirect CheckerTrace HTTP redirect chains and analyze URL redirectionsSends dataUser Agent ParserParse and analyze browser user agent strings
Generators
Generate configurations and codes2Reference
Reference materials and lookups6Reference HubComprehensive networking reference including ports, protocols, and standardsOUI LookupLook up MAC address vendor information using IEEE OUI databaseSends dataPort ReferenceQuick reference for common network ports and servicesCIDR ReferenceComplete CIDR notation cheat sheet with subnet masks and host countsProtocol ReferenceIP protocol numbers and ICMP types referenceIPv6 ReferenceIPv6 address types, prefixes, and format reference
Dev Tools
Developer and IT utilities11Hash GeneratorGenerate and verify cryptographic hashes (SHA-256, SHA-384, SHA-512, SHA-1)Password GeneratorGenerate cryptographically secure random passwordsBase64 Encoder/DecoderEncode and decode Base64 text and files, in both RFC 4648 alphabetsURL Encoder/DecoderEncode, decode, and build URLs with query parametersJSON FormatterFormat, validate, and minify JSON dataJWT DecoderDecode and inspect JSON Web TokensUnix Timestamp ConverterConvert between Unix timestamps and human-readable datesCron Expression ParserParse and understand cron expressionsRegex TesterTest and debug regular expressions with live highlightingColor ConverterConvert colors between HEX, RGB, HSL, and CMYK formatsLorem Ipsum GeneratorGenerate placeholder text for designs and mockups