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
This app has not received enough ratings or reviews to display an overview.
Monitoring, rebuilt
- A new Monitoring tab answers in one sentence, then groups services by who checks them: this device or each of your sensors. Connection and freshness are shown once per sensor, so a disconnected sensor never reads as a service outage.
- Per-service pages with 1 h / 24 h / 7 d / 30 d statistics, a latency chart that shows gaps instead of inventing data, per-source comparison, full history and a "Test from this device" button.
- 24-hour availability strips and latency sparklines on the dashboard.
- Notifications per service: in-app, system, sound, recovery and degradation alerts, confirmation count, quiet period, webhooks.
- Pause, run now and delete monitors that run on a 404 sensor, applied only after the sensor confirms.
Discovery
- Connect OPNsense, MikroTik or UniFi (read-only) to name every device and see devices on other VLANs from DHCP leases.
- Clearer map and legend, one entry per device instead of one per address, and a health summary in your language.
Security and privacy
- Sensors and the app now prove the pairing code to each other, and the connection is bound to the sensor's certificate.
- The AI assistant asks before any active probe, never targets public addresses with them, and sends nothing to a cloud AI without your consent.
- Router certificates must be approved before credentials are sent; API tokens and webhook URLs are stored in the Keychain.
- Many reliability fixes: checks that could hang, pings that never ended, parsers hardened against malformed replies.
Version 1.9.0
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