Free network, DNS & security tools
69 tools for sysadmins, DevOps and developers. Most run entirely in your browser, so nothing you paste is uploaded.
Popular tools
All categories
Network Connectivity & Diagnostics6
- BGP / ASN Prefix LookupExplore BGP routing and autonomous systems.
- BGP Looking GlassVisualize global BGP AS-PATH routing from multiple Route Collectors.
- ICMP Ping TestCheck network reachability and latency.
- TCP Port ScannerScan open ports on any target host.
- Visual IP TracerouteMap the network path to any server.
- What is my IP? (Geolocator)Geolocate any public IP address instantly.
IP Abuse & Reputation3
Subnets & IP Addressing6
- CIDR / Subnet Overlap AnalyzerCompare two lists of IP subnets to identify overlapping IP ranges and routing collisions.
- CIDR IP Range ExplorerList all IPs within a CIDR block.
- IPsec VPN Crypto Profile MatcherCompare IKE and IPsec configurations to find configuration mismatches.
- IPv4 Subnet CalculatorCalculate CIDR network boundaries.
- IPv6 Subnet Expander & CompressorFormat and expand IPv6 addresses.
- MAC Address Vendor OUI LookupIdentify the hardware vendor of a MAC.
DNS Records & Lookup4
DNS Security & Delegation3
- ACME DNS-01 Challenge DebuggerTrace and validate Let's Encrypt / ACME TXT records across global resolvers to troubleshoot certificate renewal failures.
- DNS Zone Health CheckDiagnose zone delegation: SOA serial sync, authority, open recursion and TCP support per nameserver.
- DNSSEC Chain ValidatorVerify DNSSEC cryptographic chains.
OSINT & Recon3
Email Security4
- DKIM Record GeneratorGenerate RSA key pairs and public DNS records for DKIM.
- DMARC & SPF Record GeneratorCreate secure email policies.
- Email Authentication Header AnalyzerPaste a received email's raw source to see its real SPF, DKIM and DMARC authentication results and alignment.
- Email Security AuditAudit your domain's email hygiene.
Identity Protocols5
Password & Secrets3
Cryptography & SSL/TLS7
- Advanced SSL/TLS Deep ScanDeep inspection of TLS certificate chains.
- CSR Payload GeneratorCreate Certificate Signing Requests.
- PEM / X.509 DecoderDecode SSL/TLS certificates.
- PFX / PKCS#12 GeneratorSecurely generate .pfx or .p12 files from PEM certificates and private keys 100% locally in your browser.
- RSA Key Pair GeneratorGenerate strong RSA keys locally.
- Self-Signed Certificate GeneratorGenerate secure self-signed X.509 certificates and RSA private keys directly in your browser.
- SSL Certificate & Key MatcherVerify if a Private Key, SSL Certificate, and CSR belong together by comparing their cryptographic RSA Modulus.
Web & API Debugging9
- Browser Info & UA PrintAnalyze your browser's fingerprint.
- CORS Security Preflight TesterTest Cross-Origin Resource Sharing.
- cURL Command BuilderBuild complex curl HTTP requests.
- HAR Network Log AnalyzerAnalyze HTTP Archive network logs.
- Regex Regular Expression TesterTest and debug regular expressions.
- Security Headers ScannerScan HTTP response security headers.
- URL Components & Query InspectorParse and inspect URL parameters.
- URL Redirect Chain TrackerTrace HTTP 301/302 redirect chains.
- User-Agent Parser & SpooferParse and spoof User-Agent strings.
Data Formats & Codecs10
- Base64 File Encoder/DecoderConvert files to Base64 data URIs.
- Bulk UUID/GUID GeneratorGenerate massive lists of UUIDs.
- Code Diff Viewer & ComparatorCompare two blocks of code.
- Cryptographic HashesCalculate MD5, SHA-1, SHA-256 and more.
- HTML & XML BeautifierFormat and indent markup languages.
- Pretty JSON FormatterFormat, validate and minify JSON.
- SQL Raw Query FormatterBeautify raw SQL queries.
- Universal Metadata InspectorExtract EXIF and file metadata.
- Universal String EncoderEncode strings to Base64, Hex, URL.
- YAML <-> JSON ConverterConvert between YAML and JSON.
DevOps & SysAdmin6
- Docker Run to ComposeConvert docker run commands to YAML.
- Kubernetes Manifest LinterValidate syntax and best practices for K8s manifest files.
- Linux Chmod Mode CalculatorCalculate octal file permissions.
- PAC File ValidatorTest proxy auto-config scripts in sandbox.
- Unix Cron Job ExplainerTranslate cron expressions to human text.
- Webhook Payload SimulatorConstruct, test, and fire JSON webhook payloads to any destination endpoint.