Watch entry 06 · method
The roster: a device list that stays true
Most inventories die in month two. This one survives because it asks for ten minutes a month and tolerates gaps. Sweeps, snapshots, a written diff — nothing more ambitious than a watchman's notebook.
The monthly round
- Sweep. Same tool, same range, same machine if possible. Angry IP Scanner does fine; consistency matters more than the choice.
- Snapshot. Export a dated CSV —
lan-2026-09.csv,lan-2026-10.csv. Never overwrite the old file. - Diff. Open this month next to last month. Three questions: what is new, what is gone, what moved to a new address.
- Write it down. One line per change, in plain words. "New row: phone of a guest 12th." The note is the inventory; the CSV is just its receipt.
Why plain words beat tags. In eight months nobody remembers what "UNK-17" was.
"Brother printer, moved to shelf" survives.
Reading the changes
| Change | Usual cause | When to care |
|---|---|---|
| New address | guest device, new gadget | no name and no vendor you recognise |
| Address gone | device asleep or retired | stays gone for months and it mattered |
| Address moved | DHCP lease renewed elsewhere | paired with a new MAC — that is a different device |
| Share appeared | OS upgrade or new NAS | always; check its permissions |
The habit, priced honestly
Ten minutes a month, a spreadsheet folder, and a text file that grows one line at a time. In return: when something odd appears on the network, you are not comparing against a memory — you hold twelve months of receipts. That is the entire product, and it is enough.
Tools that fit the round
Angry IP Scanner for the sweep and CSV; LizardSystems quarterly for the share audit; the Toolset when switches enter the picture and the roster grows a port column. The method stays the same at every size.