LanTopoLog: When You Just Need to See What’s Plugged in — and Where
There are days when flashy dashboards and cloud-native stacks just don’t cut it. What’s really needed is a clear, no-nonsense view of the network — something that says “this device is here, plugged into that port.” That’s exactly where LanTopoLog comes in.
It’s a lightweight Windows utility that maps network topologies, keeps an eye on connected devices, and makes sense of tangled switch configurations — without demanding complex installs or paid licenses. One click, and it starts pulling in SNMP data, discovering switches, and plotting out what’s actually wired into your network.
No agents. No remote logins. Just local insights that show what’s connected, how it’s behaving, and where it fits in.
What It’s Good At (And Why That Matters)
| Feature | What It Does in Practice |
| Switch Port Mapping | Shows which MACs are plugged into which ports — instantly |
| Topology Auto-Discovery | Builds a live map of the network using SNMP and ARP data |
| Real-Time Device Monitoring | Flags offline nodes, new connections, and changes in port usage |
| Visual Diagrams | Auto-generates network layout maps — printable and editable |
| MAC/IP Lookup | Displays IPs, vendors, hostnames, and more via built-in resolution tools |
| Syslog + Trap Support | Collects alerts from SNMP traps or Syslog-capable gear |
| Portable and Clean | No installer, no service — just unpack and run |
Who Ends Up Using It
– Network admins who want to track devices without deploying agents
– IT teams maintaining older infrastructure where CDP/LLDP still rule
– Schools, labs, and offices where unmanaged switches are everywhere
– Anyone who’s tired of guessing what’s plugged into port 18 on that switch
LanTopoLog isn’t trying to compete with big-name monitoring systems. It’s more like a quiet assistant who knows every cable by heart and doesn’t need internet access to do its job.
What’s Required
– A Windows machine (anything from 7 to Server 2022)
– SNMP-enabled switches (v1 or v2c, works with most common vendors)
– Local admin rights to read ARP and routing tables
– That’s pretty much it — no Java, no .NET drama, no setup wizard
If you’ve got a small network and SNMP works, you’re already halfway there.
Getting It Running (No Manual Needed)
1. Download the zip
Head to the official site:
https://lan-topolog.com/download.html
2. Unpack and launch
No install — just open `LanTopoLog.exe`.
3. Add your switches
Enter IPs and SNMP community strings, then click “Scan.”
4. See what’s connected
The interface will light up with ports, MACs, hostnames, and more.
5. Draw the map
Let it auto-build a visual layout or tweak one manually.
6. Export or print
Reports and diagrams can be saved as images, PDFs, or spreadsheets.
What People Say
“Helped me trace a rogue printer in under two minutes.”
“Honestly didn’t expect much from a portable SNMP tool — now I use it weekly.”
“It picked up MACs and IPs that my more expensive tools missed.”
One Last Note
LanTopoLog doesn’t try to be everything. It won’t monitor CPU usage or track cloud containers. But if the task is to find out where that mystery device is plugged in — or why port 5 on switch B just went silent — it’ll tell you. Quickly. Quietly. Without sending data anywhere.
And in many setups, that’s exactly what’s needed.
