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// Other services

Port 76: Distributed External Object Store

Port 76 is assigned by IANA to deos (Distributed External Object Store).

76

How deos works

Other services
client:76deosresponse client:76deosresponse

The client sends a request to port 76 and the deos 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 76 dangerous?

We have no specific security note for port 76. 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 76

ServicePortTransportDescriptionReferenceUpdated
deos 76 TCP, UDP Distributed External Object Store - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 76, and is it reachable?

Linux

sudo ss -ltnup 'sport = :76'      # process listening on 76
sudo lsof -nP -i :76

macOS

sudo lsof -nP -i :76

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 76 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 76
netstat -ano | findstr :76

From another machine

nmap -p 76 -sV <host>
sudo nmap -sU -p 76 <host>
nc -zv <host> 76

Block it in the firewall

sudo ufw deny 76/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 76" -Direction Inbound -LocalPort 76 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 76 used for?

Port 76 is assigned by IANA to deos (Distributed External Object Store).

Is port 76 TCP or UDP?

Port 76 is registered for TCP and UDP.

Is it safe to open port 76?

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 76 is open?

On Linux run "ss -ltnup 'sport = :76'", on macOS "lsof -nP -i :76", and on Windows "netstat -ano | findstr :76" to see the local process. From another machine, "nmap -p 76 <host>" shows whether it is reachable.

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