Free Online IT Tools
97+ browser-based utilities for network engineers, sysadmins, and developers. IP lookups, DNS checkers, SSL scanners, subnet calculators, security auditors, and more. No account or signup required.
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Network & IP Tools
22 tools
- IP Address LookupFind geographic location, ISP, and network details for any public IP address.
- DNS Records LookupQuery DNS servers to find A, AAAA, MX, CNAME, TXT, and NS records.
- Whois Domain SearchRetrieve domain registration info, expiry dates, registrar info, and owners.
- Ping & TracerouteCheck latency, estimate packet loss, and trace route hops to any host.
- Port ScannerScan standard ports to audit security profiles of active host domains.
- Subnet & CIDR CalculatorCompute host boundaries, usable ranges, masks, and network IDs.
- BGP / ASN LookupIdentify ASN registrar networks, upstream peers, and IP block allocations.
- MAC Address / OUI LookupDetermine manufacturer, hardware vendor, and device type allocations.
- IPv4 ↔ IPv6 ConverterConvert IP address representations between expanded, compressed, and mapped forms.
- Open Port CheckerAudit status of specific listening ports on target servers or networks.
- IPv6 Subnet CalculatorCompute host boundaries, ranges, and subnets for IPv6 allocations.
- IP Range CalculatorConvert arbitrary IP ranges (start-end) into CIDR blocks.
- VLSM Subnet CalculatorAllocate variable length subnet masks based on required hosts.
- Supernet & CIDR AggregatorSummarize multiple IP ranges and CIDR blocks into a single supernet.
- Wildcard Mask CalculatorCalculate wildcard (inverse) masks for Cisco access control lists (ACLs).
- MTU & MSS CalculatorCalculate TCP Maximum Segment Size (MSS) based on MTU and protocol encapsulation overhead.
- Global Ping TesterPing and check server response latencies from multiple global cities simultaneously.
- BGP Route VisualizerVisualize BGP routing paths, autonomous systems (AS), and upstream internet provider hops.
- TCP Port Banner GrabberEstablish raw TCP connections to query listening services and extract software version banners.
- Network Latency HeatmapMeasure real-time connection latencies to major cloud provider datacenters globally.
- WHOIS History LookupLook up historical WHOIS records to trace administrative changes and ownership timeline.
- Bulk Reverse DNS LookupResolve lists of IP addresses to their reverse DNS PTR hostnames concurrently in bulk.
Security Tools
16 tools
- Password GeneratorCreate strong, customizable cryptographically secure passwords.
- Password Strength CheckerAudit credential health, entropy calculations, and crack time estimates.
- Data Breach CheckerAudit if account email identifiers have been exposed in known data leaks.
- URL Safety & Malware ScannerAudit domains and external URLs against malware, phishing, virus payloads, and threat databases.
- IP Reputation CheckerAnalyze threat level, spam scores, and abuse logs associated with an IP.
- MD5/SHA Hash GeneratorCalculate MD5, SHA-1, SHA-256, and SHA-512 values client-side.
- File Hash CheckerCompute file cryptographic signatures to check integrity against expected hashes.
- SSL Certificate CheckerVerify SSL/TLS installation details, expiry dates, and trust chains of a host.
- Full Website Security ScannerRun a deep audit of SSL, headers, open ports, reputation, cookies, and information disclosure.
- CVE Vulnerability CheckerSearch database records for vulnerabilities matching tech stacks or CVE IDs.
- HTTP Security Headers AnalyzerValidate security header directives and generate server implementation code.
- SSL Security AuditorExamine protocol versions, cipher suite strengths, and HSTS setups.
- CORS Security CheckerTest Access-Control headers, credentials allowances, and reflection safety.
- CSP Analyzer & BuilderInspect Content Security Policy directives and highlight unsafe options.
- DNS Security AnalyzerValidate DNSSEC, DMARC/SPF defenses, and check zone transfer availability.
- Firewall Rule GeneratorGenerate iptables, nftables, ufw, and Windows Firewall rules from a simple form. Export ready-to-paste commands.
Email & Deliverability
6 tools
- Email Header AnalyzerPaste raw email headers to visualize delivery hops, SPF/DKIM/DMARC authentication results, and detect spoofing.
- SPF Record GeneratorBuild a valid SPF TXT DNS record from IP addresses, domains, and includes. Copy-paste ready output.
- DMARC Policy BuilderCreate a DMARC DNS record with policy level, reporting addresses, and alignment mode. Prevent email spoofing.
- DKIM Key GeneratorGenerate RSA DKIM key pairs and the DNS TXT record for your mail server. Keys generated securely in-browser.
- Email Blacklist CheckerCheck if your domain or IP is listed on major spam blacklists (Spamhaus, Barracuda, SORBS, and 50+ others).
- MX Record Propagation CheckerVerify MX record propagation across 20+ global DNS servers simultaneously. Diagnose mail routing issues.
Config Generators
5 tools
- Nginx Config GeneratorGenerate optimized Nginx server blocks for reverse proxies, static sites, PHP, and SSL configurations.
- Apache .htaccess GeneratorGenerate .htaccess files for redirects, custom error pages, caching rules, and security policies.
- SSH Config GeneratorManage multiple SSH hosts by generating formatted SSH client config files.
- SSL/TLS Config GeneratorGenerate hardened SSL/TLS configurations for Nginx, Apache, or HAProxy based on Mozilla guidelines.
- Crontab Validator & TesterValidate cron expressions, translate them to human-readable terms, and estimate next run times.
Certificate Tools
5 tools
- SSH Key GeneratorGenerate cryptographically secure SSH key pairs (RSA or ECDSA) client-side in your browser.
- SSL Certificate DecoderDecode and inspect X.509 certificates to verify Common Name, Issuer, validity dates, and public key data.
- SSL Certificate ConverterConvert SSL certificates between PEM (Base64) and DER (binary) formats client-side.
- CSR GeneratorGenerate standard Certificate Signing Requests (CSR) and private keys client-side to request SSL certificates.
- Self-Signed Certificate GeneratorCreate local self-signed SSL/TLS certificates and private keys instantly in-browser for development and testing.
AI-Powered Tools
5 tools
- AI Config File ExplainerPaste server configuration scripts (Nginx, Apache, SSH, Firewall) and get detailed line-by-line explanations in plain English.
- AI Error Code DecoderPaste application error logs, crash details, or exit codes to diagnose root causes and generate step-by-step resolution checklists.
- AI Log File AnalyzerPaste server, container, or web application log blocks to summarize event logs, parse error patterns, and flag system anomalies.
- AI Script ExplainerPaste Bash shell scripts, Python, or PowerShell files to analyze operational flows, lines of logic, and inspect security risks.
- AI Regular Expression GeneratorDescribe what text you want to match in plain English and automatically compile valid regex patterns, token guides, and tests.
Website & Server Tools
5 tools
- Website Uptime CheckerAudit server status, response headers, and delay parameters.
- HTTP Headers InspectorInspect response headers and verify active browser security metrics.
- Redirect Chain TracerFollow full navigation hops, redirect headers, and detect loops.
- Page Speed AnalyzerRequest Core Web Vitals performance parameters for desktop and mobile.
- Broken Link CheckerScan and verify links on a target page for 404s and errors.
Developer Tools
12 tools
- JSON Formatter & ValidatorFormat, validate, beautify, and minify JSON data with real-time error highlights.
- Base64 Encoder/DecoderEncode plain text or files to Base64 formats and decode back instantly.
- JWT Analyzer & DecoderParse tokens to audit active headers, claims, payloads, and signatures.
- Regex Tester & DebuggerEvaluate regular expressions, capture matches, and check group bindings.
- URL Encoder & DecoderSanitize query inputs, escape parameters, or decode URL paths.
- HTML Entity ConverterEscape markup text characters to HTML entities to secure code rendering.
- Unix Timestamp ConverterTranslate epochs to local dates and follow real-time clock tickers.
- UUID/GUID GeneratorGenerate single or bulk RFC 4122 compliant UUID v1 and v4 keys.
- Cron Expression BuilderConstruct visual schedules, view human translations, and next execution runs.
- Code Beautifier / MinifierFormat and minify HTML, CSS, JavaScript, JSON, and SQL codes in-browser.
- Text Diff CheckerInspect side-by-side block differences, additions, and line alterations.
- Markdown to HTMLConvert markdown text to standard parsed HTML markup code.
Conversion & Calculation
21 tools
- Number Base ConverterTranslate integers between binary, octal, decimal, and hexadecimal bases.
- File Size ConverterConvert size volumes between byte increments (KB, MB, GB, TB, PB).
- Bandwidth CalculatorEstimate transfer times for file sizes across varying link network speeds.
- RAID CalculatorCalculate capacity allocations, drive limits, and performance indexes.
- HTTP Status Code ReferenceInteractive reference of HTTP headers, protocols, and standard status codes.
- Cloud Cost EstimatorEstimate VM compute, storage, and outbound egress costs for standard cloud servers.
- Multi-Cloud Compute ComparisonCompare compute instance specs and costs side-by-side between AWS, Azure, and GCP.
- AWS EC2 Instance Cost CalculatorCalculate AWS EC2 monthly costs based on region, instance type family, OS, and pricing plans.
- Cloud Storage & Egress Cost EstimatorCompute standard cloud storage, storage tier classes, and monthly egress data transfer fees.
- Kubernetes Cluster Cost CalculatorEstimate Kubernetes cluster control plane, worker node compute, storage, and load balancer costs.
- Serverless Function Cost CalculatorCalculate monthly serverless function costs (AWS Lambda, Azure Functions) based on memory and executions.
- Reserved vs On-Demand ROI CalculatorCompute the break-even timeline and net savings of purchasing reserved cloud instances vs on-demand.
- Cloud Migration TCO CalculatorCompare physical on-premises datacenter hosting costs (servers, space, power) vs cloud migration.
- Auto Scaling Cost Savings EstimatorCompare dynamically scaling VM clusters vs static peak-provisioned VM infrastructure costs.
- FinOps Cost Savings & Ingestion EstimatorEstimate log ingestion costs and identify savings from reclaiming idle compute, load balancers, and unattached disks.
- SLA Uptime & Allowed Downtime CalculatorCalculate daily, weekly, monthly, and yearly allowed downtime based on SLA uptime percentages.
- Error Budget CalculatorCompute allowed error count, remaining budget, and burn rate based on SLO uptime targets.
- Server Capacity & Resource Sizing CalculatorEstimate CPU cores, RAM, and bandwidth resources needed for target peak concurrent users.
- Auto Scaling Threshold CalculatorCalculate recommended scale-out and scale-in thresholds based on target CPU workload capacities.
- Incident Cost CalculatorEstimate total financial impact of IT downtime including revenue loss, labor overhead, and SLA penalties.
- Backup RPO/RTO CalculatorEvaluate backup frequencies and system restore rates against target RPO/RTO disaster recovery objectives.
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