LanScan 8.2.17 — Mac version

If you have ever opened Network Utility just to do a quick port scan, LanScan is the proper tool you kept wishing for. It does the same job of poking around your local network but goes much further, mapping out every device and giving you useful details about each one.

How does it find devices that don't advertise themselves?

It sends ARP packets across the subnet, so even quiet or headless hardware gets spotted. That means printers, smart plugs and old servers all show up without needing any special software on them.

What makes a device entry genuinely useful?

It pulls hostnames from DNS, mDNS and SMB all at once—showing up to four names per IP. You can also attach your own custom comment to a device, which is a lifesaver for labelling things like 'leaky tap sensor' or 'Dave's dusty Pi 3'.

Can it handle huge networks?

There is no artificial limit on the number of devices found. You can scan a single IP range or the full IPv4 address space, then hide or show any column to keep the results readable before exporting everything to a CSV file.

Opening a device’s web interface straight from a scan result

Beyond the CSV export, you can configure a custom URL to open from a selected device. That lets you jump straight from a scan result into a web interface or monitoring page with one click.

Letting LanScan through the Mac firewall so it sees every device

First run not showing every device? That is usually the Mac's own firewall getting in the way of inbound ARP replies. Allow LanScan in System Settings → Network → Firewall → Options and scan again.

If hostnames come back blank, check that the target devices actually respond to mDNS or NetBIOS. Plenty of cheap IoT kit only answers to its own app, so a missing name is not always a fault in LanScan.

Scanning a public range and seeing very few results? Some routers drop Ping or SMB packets by design. Switch the scan method or narrow the range to a subnet you actually manage. That usually brings the quiet hosts out of hiding.

One more thing worth knowing: if you run the lanscan dmg from a clean download and macOS complains, right-click the app and choose Open. Gatekeeper sometimes needs that extra nod the first time.

Finding a missing office printer with one subnet scan

Say the office printer has vanished from the queue again. You open LanScan and it immediately lists the interfaces it can see — Ethernet, Wi-Fi, maybe a VPN tunnel. Pick the one the printer should be on.

1. Click Scan and wait a few seconds while ARP packets do their round trip.
2. Spot the printer's IP in the list, or use the vendor column to narrow things down.
3. Click the row and open the printer's web page via the custom URL you set up earlier.
4. Add a comment like “front desk, keeps dropping” so next time you know which one it is.

The whole thing takes under a minute. No terminal, no asking someone to read an IP off a tiny LCD screen.

Scrolling and sorting live results while a large range is still scanning

Scanning a normal home or small office subnet finishes in seconds. Larger ranges take longer, but LanScan stays responsive while it works — you can scroll results and sort columns without the beachball making an appearance.

Memory use is modest. It sits quietly in the background when you are not scanning, and on older Intel Macs it does not feel heavy. On Apple Silicon it barely registers.

Stability has been solid in my experience. If you grab the lanscan mac download and use it weekly, expect it to behave more like a utility than an app that wants your attention all day.

• macOS 11 or later
• Apple Silicon or Intel 64-bit Mac