Network Tools
Subnetting, DNS, latency, and other networking calculators and lookups.
14 tools
BGP AS Lookup
Look up BGP Autonomous System information, routing data, and AS path details for network analysis and troubleshooting.
DNS Record Checker - Verify SPF, DKIM, DMARC & More
Free DNS lookup tool: query A, AAAA, MX, TXT, CNAME, NS, SOA records instantly. Verify SPF, DKIM, DMARC email security settings and troubleshoot DNS issues.
Firewall Rule Logic Simulator
Free interactive firewall rule simulator. Build rulesets, craft test packets, and trace rule matching with stateful/stateless inspection modes.
Free IP Subnet Calculator - IPv4 & IPv6 CIDR Tool
Calculate subnet masks, network addresses, broadcast addresses, and usable host ranges for IPv4 and IPv6. CIDR notation support.
IP Geolocation Lookup
Free IP geolocation lookup. Find geographic location, ISP, ASN, organization, and network information for any IPv4 or IPv6 address with interactive map visualization.
IPv4 to IPv6 Converter
Convert between IPv4 and IPv6 address formats instantly. Supports IPv4-mapped, 6to4, Teredo, and format conversion. Free online converter.
MAC Address Lookup
Free MAC address lookup — identify the manufacturer of any device from its MAC. Batch lookup, 30,000+ IEEE OUI entries, EUI-64 support and all MAC formats.
Network Latency Calculator
Calculate network latency based on distance and transmission medium. Estimate round-trip time for network planning.
Port Reference
Comprehensive searchable database of common network ports, protocols, and services. Find port numbers, check if ports are safe to open, and identify protocol details.
Redirect Chain Checker
Free redirect chain checker. Analyze HTTP redirect chains, identify redirect loops, detect mixed content issues, and optimize 301/302 redirect paths for SEO and performance.
TCP Window Size Calculator
Calculate optimal TCP window sizes based on bandwidth-delay product. Optimize network throughput for high-latency links.
URL Expander
Free URL expander tool. Safely expand shortened URLs from bit.ly, tinyurl, t.co and other services to reveal the final destination and check for malicious redirects.
WHOIS Lookup
Free WHOIS lookup tool. Query domain registration details including registrar, owner, nameservers, expiration dates, and DNSSEC status for any domain name.
Wireless Security Architecture Planner
Free wireless security planning tool. Compare WEP/WPA/WPA2/WPA3, select 802.11 standards, plan antenna placement, and generate deployment guides.