In modern networks, NetBIOS normally runs over TCP/IP via the NetBIOS over TCP/IP (NBT) protocol. This results in each computer in the network having both an IP address and a NetBIOS name corresponding to a (possibly different) host name.

Jun 10, 2020 Port 445 (tcp/udp) :: SpeedGuide In Windows NT it ran on top of NetBT (NetBIOS over TCP/IP, ports 137, 139 and 138/udp). In Windows 2K/XP, Microsoft added the possibility to run SMB directly over TCP/IP, without the extra layer of NetBT. For this they use TCP port 445. Port 445 should be blocked at the firewall level. It can also be disabled by deleting the HKLM\System NetBIOS - Wikipedia In modern networks, NetBIOS normally runs over TCP/IP via the NetBIOS over TCP/IP (NBT) protocol. This results in each computer in the network having both an IP address and a NetBIOS name corresponding to a (possibly different) host name. Enable NetBIOS over TCP/IP on Windows 10 - YouTube

directly over TCP, port 445; via the NetBIOS API, which in turn can run on several transports: on UDP ports 137, 138 & TCP ports 137, 139 – see NetBIOS over TCP/IP; on several legacy protocols such as NBF (incorrectly referred to as NetBEUI).

May 10, 2011 · In Windows NT it ran on top of NetBT (NetBIOS over TCP/IP, ports 137, 139 and 138/udp). In Windows 2K/XP, Microsoft added the possibility to run SMB directly over TCP/IP, without the extra layer of NetBT. For this they use TCP port 445. Port 445 should be blocked at the firewall level. - port TCP 139 (session services) NetBIOS over TCP/IP (NBT) est installé et activé par défaut pour permettre une rétrocompatibilité avec d'anciens systèmes (ou implémentations de SMB); Toutefois, le service Microsoft SMB peut être utilisé sans la présence de Microsoft NetBIOS/NetBT. NetBIOS over TCP/IP (NBT, or sometimes NetBT) is a networking protocol that allows legacy computer applications relying on the NetBIOS API to be used on modern TCP/IP networks. NetBIOS was developed in the early 1980s, targeting very small networks (about a dozen computers).

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Mar 12, 2010 Saying Goodbye to NetBIOS - 10-D Security