404 Network is the most comprehensive network diagnostics toolkit for iOS and macOS. Whether you're a network engineer troubleshooting connectivity or a security enthusiast auditing your home network, 404 gives you professional-grade tools in a beautiful native app.
CORE TOOLS (FREE)
• Real ICMP Ping with live latency charts
• Visual Traceroute with hop-by-hop analysis
• DNS Lookup with multiple server comparison
• Speed Test with ISP detection
• WiFi Info with signal strength monitoring
• Port Scanner with service detection
• Network Discovery with live topology map
• Wake-on-LAN for remote device power
• HTTP Probe for web server testing
• Whois domain lookup
PRO FEATURES
• 70+ network diagnostic tools
• Unlimited saved devices with background monitoring
• Full port scan results with banner grabbing
• 30-day diagnostic history with CSV/JSON/PDF export
• Color tags, device groups, and topology presets
• Community speed map — compare ISP performance in your area
• Security Audit with vulnerability detection
• WiFi Channel Analyzer
• Smart Home device diagnostics
• LAN Speed Test and Micro Speed Logger
PRO+ ADVANCED
• AI Assistant powered by Claude or on-device Apple Intelligence
• AI-guided Security Audit and Penetration Test flows
• Remote Sensor dispatch — run tools from multiple network vantage points
• BLE Scanner Pro with GATT exploration and characteristic writing
• NFC Toolkit — read, write, and clone-detect NFC tags
• SSH Tester, SNMP Walker, Credential Checker
• Subdomain Finder, CORS Checker, CSP Analyzer
• Packet Crafter, Payload Library, Directory Scanner
PRIVACY FIRST
• No ads. No tracking. No analytics.
• All network data stays on your device
• Community features are opt-in with location rounded to ~500m
• AI features require your own API key — we never see your data
• Full GDPR compliance with data export and deletion
TERMS OF USE
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
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Connect your 404 apps
• A new Devices screen connects 404 on iPhone, iPad and Mac using reciprocal invitations and certificate-pinned TLS.
• Measure received application bytes and round-trip latency, including latency under load. Review the data budget before starting.
• Compare HTTPS diagnostics, save reports locally and export measurement campaigns.
• Control an iPhone measurement from Apple Watch and receive progress and completion feedback.
• French translations, clearer accessibility labels and connection reliability improvements.
Keep both apps open for device-to-device tests. These measurements describe the tested path; they do not measure IP packet loss.
Version 1.10.0
The developer, Christine Martin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Location
Identifiers
Diagnostics
Other Data
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More