CyberHunter
Local dataset, no network
// Other services

Port 901: SMPNAMERES

Port 901 is assigned by IANA to smpnameres (SMPNAMERES).

901

How smpnameres works

Other services
client:901smpnameresresponse client:901smpnameresresponse

The client sends a request to port 901 and the smpnameres service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 901 dangerous?

We have no specific security note for port 901. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 901

ServicePortTransportDescriptionReferenceUpdated
smpnameres 901 TCP, UDP SMPNAMERES - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 901, and is it reachable?

Linux

sudo ss -ltnup 'sport = :901'      # process listening on 901
sudo lsof -nP -i :901

macOS

sudo lsof -nP -i :901

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 901 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 901
netstat -ano | findstr :901

From another machine

nmap -p 901 -sV <host>
sudo nmap -sU -p 901 <host>
nc -zv <host> 901

Block it in the firewall

sudo ufw deny 901/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 901" -Direction Inbound -LocalPort 901 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 901 used for?

Port 901 is assigned by IANA to smpnameres (SMPNAMERES).

Is port 901 TCP or UDP?

Port 901 is registered for TCP and UDP.

Is it safe to open port 901?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 901 is open?

On Linux run "ss -ltnup 'sport = :901'", on macOS "lsof -nP -i :901", and on Windows "netstat -ano | findstr :901" to see the local process. From another machine, "nmap -p 901 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news