CyberHunter
Local dataset, no network
// Other services

Port 1261: mpshrsv

Port 1261 is assigned by IANA to mpshrsv (mpshrsv).

1261

How mpshrsv works

Other services
client:1261mpshrsvresponse client:1261mpshrsvresponse

The client sends a request to port 1261 and the mpshrsv 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 1261 dangerous?

We have no specific security note for port 1261. 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 1261

ServicePortTransportDescriptionReferenceUpdated
mpshrsv 1261 TCP, UDP mpshrsv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1261, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1261'      # process listening on 1261
sudo lsof -nP -i :1261

macOS

sudo lsof -nP -i :1261

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1261 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1261
netstat -ano | findstr :1261

From another machine

nmap -p 1261 -sV <host>
sudo nmap -sU -p 1261 <host>
nc -zv <host> 1261

Block it in the firewall

sudo ufw deny 1261/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1261" -Direction Inbound -LocalPort 1261 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1261 used for?

Port 1261 is assigned by IANA to mpshrsv (mpshrsv).

Is port 1261 TCP or UDP?

Port 1261 is registered for TCP and UDP.

Is it safe to open port 1261?

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 1261 is open?

On Linux run "ss -ltnup 'sport = :1261'", on macOS "lsof -nP -i :1261", and on Windows "netstat -ano | findstr :1261" to see the local process. From another machine, "nmap -p 1261 <host>" shows whether it is reachable.

05 Related
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