Network Engineering Tools

Professional-grade tools for network engineers, system administrators, and IT professionals. All tools are free to use with no registration required.

What's My IP?

Instantly see your public IPv4 or IPv6 address along with geolocation, ISP, and network details. No input needed.

Auto-detectionIPv4 & IPv6GeolocationISP & network info
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IP Subnet Calculator

Calculate IPv4/IPv6 subnets with CIDR notation. Get network address, broadcast address, usable host range, and subnet mask in binary format.

CIDR notation supportUsable host calculationBinary subnet maskPrivate network detection
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DNS Lookup

Query DNS records including A, AAAA, MX, TXT, CNAME, and NS records. Check DNS propagation across multiple locations.

Multiple record typesReverse DNS lookupPropagation checkerDNSSEC validation
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Port Checker

Test if specific TCP ports are open or closed on any host. Includes common port reference and service identification.

TCP port scanningService identificationCommon ports databaseResponse time measurement
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Website Status Checker

Check if a website is up or down. Get HTTP status codes, response times, and SSL certificate status.

Real-time availabilityHTTP status codesResponse timeSSL verification
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IP Address Lookup

Get detailed information about any IP address including geolocation, ISP, ASN, and organization details.

Geolocation dataISP informationASN lookupTimezone detection
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Bandwidth Calculator

Convert between bandwidth units (Mbps, GB/s) and calculate file transfer times based on connection speed.

Unit conversionTransfer time calculatorThroughput estimationMultiple formats
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SSL/TLS Certificate Checker

Analyze SSL/TLS certificates including validity, issuer information, certificate chain, and cipher suite details.

Certificate validity checkChain validationExpiry monitoringCipher suite details
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WHOIS Lookup

Query domain WHOIS information including registrar, registration dates, nameservers, and domain status.

Domain registration detailsRegistrar informationExpiry date trackingNameserver lookup
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Ping & Latency Tester

Measure network latency using TCP connections. Get min/max/average latency, packet loss percentage, and jitter statistics.

TCP latency measurementMulti-round testingPacket loss detectionMin/Max/Avg/Jitter stats
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Network Config Generator

Generate configuration files for iptables, Nginx reverse proxy, Apache, and ACL rules.

Firewall rule templatesNginx reverse proxyApache configurationCopy and download
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IP Range Classifier

Identify whether any IPv4 or IPv6 address belongs to a private, CGNAT, loopback, multicast, documentation, or other special-purpose range. Includes RFC references and routability info.

IPv4 & IPv6RFC referencesPrivate/CGNAT/Tunnel detectionQuick reference table
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We're constantly adding new tools based on community feedback. Have a suggestion? Let us know what tools would help your workflow.

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Network Tools - Free Online IP, DNS & Port Tools | NetworkGeekTools