NetDebug ToolkitNetwork diagnostics,
simplified.
Ping, DNS, Whois, Traceroute, Port Scan, TLS Inspector, Wake-on-LAN, and more — chain any of them into one-tap workflows with the new My Automation builder.
My Automation
Chain any combination of tools into a one-tap workflow. See every result on one screen, export the whole run as PDF, PNG, or text, and trigger it from a deeplink.
Saved Hosts
Save frequently tested hosts and run any tool against them instantly with one tap. Export the result as PDF, PNG, or text, and trigger it from a deeplink.
Run History & Trends
Every run is saved on-device and charted over time — latency, speed, reachability, and more. Free, with longer retention as a bundle perk.
Fast & Structured Output
Every tool returns clean, structured results designed for quick troubleshooting — not walls of text.
All 20 Tools
Everything you need for network diagnostics, organized by workflow.
Ping
Check host reachability and measure response time.
HTTP(S) Check
Inspect status codes, redirect chains, and TLS summaries.
Speed / Latency Baseline
Measure latency, jitter, download, and upload speed.
iperf3 Client
TCP throughput tests against an external iperf3 server.
Traceroute
Trace the network path and latency to any destination.
Path MTU Discovery
Find the largest packet a path carries and detect MTU black holes.
TCP/UDP Connect
Test if a specific TCP or UDP host:port is reachable.
NTP Time Check
Query an NTP time server and compare it with the device clock.
Public IP + Geo/ASN
View your public IP, ISP, ASN, and approximate location.
Whois
Look up domain or IP registration details via RDAP and WHOIS.
DNS Lookup
Resolve DNS records with optional custom resolver support.
DNS Record Explorer
Explore A, AAAA, CNAME, MX, TXT, NS, SRV records with TTL.
TLS Certificate Inspector
Inspect certificate expiry, SAN entries, issuer chain, and weak signals.
Port Scan
Scan selected TCP ports and review open/closed/filtered outcomes.
External Port Check
Ask a server on the internet to connect back to a port on your public IP.
LAN Scan
Discover active devices on your local subnet.
Subnet Calculator
Calculate subnet details, boundaries, and host counts from CIDR.
mDNS / Bonjour Browser
Discover .local Bonjour services like AirPlay, HomeKit, and printers.
UPnP / NAT-PMP Discovery
Detect gateway UPnP IGD and NAT-PMP with external-IP hints.
Wake-on-LAN
Send a magic packet to wake compatible devices on your network.
Available on
From the blog
Guides to the network problems people actually run into, from Wi-Fi that connects to nothing through to self-hosting behind CGNAT.
Wi-Fi connected but no internet
Four tests, in order, that tell you whether it is your device, your router, DNS or your ISP.
DNS server not responding
NXDOMAIN, SERVFAIL and timeouts are different problems. One comparison tells them apart.
How to test for packet loss
Why speed tests miss it, how long to run the test, and the traceroute trap that fools everyone.
High ping and lag
Lag is latency, not bandwidth. Where the delay is added and which part you can actually fix.
Port forwarding not working
Seven things have to be true. Start with the ten second check that rules out CGNAT.
Your connection is not private
Each certificate error points somewhere different. Start by checking your clock.
502, 503 and 504 explained
All server side, all different. Which one means crashed, which means slow, which means deliberate.
Video calls keep freezing
A call needs a few megabits. It is jitter that breaks it, and a speed test cannot see jitter.
Who is on my Wi-Fi?
Scan your subnet, name every device, and judge an unfamiliar one properly.
Self-hosting behind CGNAT
If your router's WAN address is not your public IP, no forwarding rule will ever work. Five options that do.
HTTPS for homelab services
Real certificates on services nobody outside can reach, with no open ports and no browser warnings.
Docker container not reachable
Container up, logs clean, nothing connects. Six causes, and the test that rules out the other five.
Ready to debug your network?
Download NetDebug Toolkit for free on the App Store.