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Network Tools

Network diagnostics, DNS, IP, and connectivity analysis tools

12 tools available
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Subnet Calculator

Calculate subnet masks, network ranges, and IP addressing

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DNS Lookup

Query DNS records with email security analysis and health scoring

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Port Reference

Comprehensive network port reference database with search - 5,900+ ports

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URL Expander

Expand shortened URLs safely and analyze redirect chains with security checks

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Redirect Chain Checker

Trace HTTP redirect chains and analyze response headers for debugging

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IP Geolocation Lookup

Look up geographic location, ISP, and threat intelligence for IP addresses

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WHOIS Lookup

Query domain registration information, expiration dates, and nameservers

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BGP AS Lookup

Look up BGP Autonomous System information by ASN or find which AS an IP address belongs to

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MAC Address Lookup

Advanced MAC address analyzer with instant OUI lookup, batch processing, vendor search, duplicate detection, binary visualization, EUI-64 conversion, and lookup history

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Network Latency Calculator

Calculate network latency, ping distance, and data transfer times between locations

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TCP Window Size Calculator

Calculate optimal TCP window sizes, BDP, and buffer configurations for WAN optimization. Generate OS-specific tuning commands for Linux, Windows, and macOS to maximize network throughput.

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IPv4/IPv6 Converter

Convert between IPv4 and IPv6 address formats. Supports IPv4-mapped, 6to4, and format conversion between compressed and full forms.

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Frequently Asked Questions

Why might DNS lookup results differ from what I see locally?

DNS results vary based on geographic location, DNS provider, and cache timing. Our lookups query authoritative nameservers directly. If you see different results locally, your ISP or local resolver may have cached older records. TTL values in results indicate how long records are cached.

How accurate is WHOIS information?

WHOIS data comes from domain registrars and varies in completeness. Privacy protection services may obscure registrant details. For security investigations, WHOIS provides useful metadata like registration dates and nameservers even when contact info is redacted.

Can I use the subnet calculator for IPv6?

Yes, the subnet calculator supports both IPv4 and IPv6 addressing. IPv6 calculations include prefix lengths, address ranges, and network/host portions. We also offer a dedicated IPv4/IPv6 converter for format translation.

How do I check if an IP address is malicious?

Start with the IP Geolocation Lookup to identify the network owner and location. For reputation data, use our IP Risk Checker which queries threat intelligence feeds. Combine this with BGP AS Lookup to understand the hosting infrastructure.