Quick Answer: What Are Ports 137 And 138 Used For?

Is NetBIOS a security risk?

Vulnerabilities in Windows Host NetBIOS to Information Retrieval is a Low risk vulnerability that is also high frequency and high visibility.

This is the most severe combination of security factors that exists and it is extremely important to find it on your network and fix it as soon as possible..

Why would an attacker want to perform a scan on port 137?

from their windows machine and collect information about your windows machine (if you are not blocking traffic to port 137 at your borders). …

How do I check if port 139 is open?

For test the port 139, please try use the IP address of the server, NetBIOS or FQDN. You can use the telnet command or PortQuery tools.

What is the protocol for port 138?

Port 138 DetailsPort(s)ProtocolService138tcptrojan138tcpChode138udpthreat138tcp,udpnetbios-dgm2 more rows

What is the use of port 135?

Port 135 exposes where DCOM services can be found on a machine. Hacker tools such as “epdump” (Endpoint Dump) can immediately identify every DCOM-related server/service running on the user”s hosting computer and match them up with known exploits against those services.

Does SMB need NetBIOS?

Windows supports file and printer sharing traffic by using the SMB protocol directly hosted on TCP. This differs from earlier operating systems, in which SMB traffic requires the NetBIOS over TCP (NBT) protocol to work on a TCP/IP transport.

What is port 444 used for?

The port 444 is standard for SNPP servers, and it is free to use from the sender’s point of view. Maximum message length can be carrier-dependent. Once connected, a user can simply enter the commands to send a message to a pager connected to that network.

What type of traffic is normally seen over UDP port 137?

UDP: Typically, NBNS uses UDP as its transport protocol. The well known UDP port for NBNS traffic is 137.

What is NetBIOS port used for?

Name:netbios-nsPurpose:NetBIOS Name ServiceDescription:UDP NetBIOS name query packets are sent to this port, usually of Windows machines but also of any other system running Samba (SMB), to ask the receiving machine to disclose and return its current set of NetBIOS names.Related Ports:138, 139, 445

What port is 4444?

Service Name and Transport Protocol Port Number RegistryService NamePort NumberUnauthorized Use Reportednv-video4444krb524 assigned the port, nv used it without an assignment44324-44443cognex-dataman44444444446 more rows•Apr 7, 2021

What is port 139 commonly used for?

The port 139 is used for File and Printer Sharing but happens to be the single most dangerous Port on the Internet. This is so because it leaves the hard disk of a user exposed to hackers.

Is NetBIOS needed?

NetBIOS is legacy and you only need it if you are using old applications or old versions of Windows that require it or use WINS. If your running applications or OS’s that require it still, NetBIOS is probably not the real problem here.

What are ports 139 and 445 used for?

Microsoft Windows Networking Services Port 135 is used for RPC client-server communication, and ports 139 and 445 are used for authentication and file sharing. UDP ports 137 and 138 are used for local NetBIOS browser, naming, and lookup functions.

What ports do hackers use?

In your security tests, be sure to check these commonly hacked TCP and UDP ports:TCP port 21 — FTP (File Transfer Protocol)TCP port 22 — SSH (Secure Shell)TCP port 23 — Telnet.TCP port 25 — SMTP (Simple Mail Transfer Protocol)TCP and UDP port 53 — DNS (Domain Name System)More items…

What is the port 8080?

Where. localhost ( hostname ) is the machine name or IP address of the host server e.g Glassfish, Tomcat. 8080 ( port ) is the address of the port on which the host server is listening for requests.

Which protocol usually listens on ports in the 137 139 range?

Common Internet File Service (CIFS) is the successor to the server message block (SMB) protocol. CIFS is the primary protocol used by Windows systems for file sharing. CIFS uses UDP ports 137 and 138, and TCP ports 139 and 445. Your storage system sends and receives data on these ports while providing CIFS service.

What is the use of port 137?

Port 137 is utilized by NetBIOS Name service. Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet.

Why is NetBIOS bad?

There are quite a few reasons why NetBIOS is bad for your network. NetBIOS is an inneficient protocol. It is very chatty with lots of broadcasts. When used with its defaults settings, it can be used by the bad guys to gather information about your network and users.

What is NetBIOS and how does it work?

NetBIOS provides communication services on local networks. It uses a software protocol called NetBIOS Frames that allows applications and computers on a local area network to communicate with network hardware and to transmit data across the network.

Is port 139 required for SMB?

What Are Ports 139 And 445? SMB has always been a network file sharing protocol. As such, SMB requires network ports on a computer or server to enable communication to other systems. SMB uses either IP port 139 or 445.

Should I open port 139?

If you are on Windows-based network that is running NetBios, it is perfectly normal to have port 139 open in order to facilitate that protocol. If you are not on a network using NetBios, there is no reason to have that port open.