A NetBIOS share scanner maps hidden network resources by querying specific network ports (UDP ⁄138 and TCP ⁄445) to systematically discover active hosts, enumerate their services, and uncover hidden or administrative directory shares.
Even though resources suffixed with a \(</code></strong> sign (like <code>C\) or ADMIN$) are flagged as “hidden” from the standard Windows File Explorer network view, they are completely visible to specialized network scanners because the protocol itself provides no native mechanism to obscure the shares from low-level API queries. 1. Active Host Discovery (Port Scanning)
The scanner begins by sending out targeted probes across a range of IP addresses. It watches for active responses on traditional NetBIOS over TCP/IP (NBT) ports and direct SMB ports: UDP Port 137: NetBIOS Name Service (NBNS). UDP Port 138: NetBIOS Datagram Service.
TCP Port 139: NetBIOS Session Service (older SMB transport).
TCP Port 445: Direct-hosted SMB (modern Windows file sharing). 2. Service and Host Enumeration Network Shares-SMB Tool – NetScanTools
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