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// Network services

Port 1308: Optical Domain Service Interconnect (ODSI)

Port 1308 is assigned by IANA to odsi (Optical Domain Service Interconnect (ODSI)).

1308

How odsi works

Network services
client:1308odsiresponse client:1308odsiresponse

The client sends a request to port 1308 and the odsi 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
Network services
01 Security

Is port 1308 dangerous?

We have no specific security note for port 1308. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 1308

ServicePortTransportDescriptionReferenceUpdated
odsi 1308 TCP, UDP Optical Domain Service Interconnect (ODSI) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1308, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1308'      # process listening on 1308
sudo lsof -nP -i :1308

macOS

sudo lsof -nP -i :1308

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1308 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1308
netstat -ano | findstr :1308

From another machine

nmap -p 1308 -sV <host>
sudo nmap -sU -p 1308 <host>
nc -zv <host> 1308

Block it in the firewall

sudo ufw deny 1308/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1308" -Direction Inbound -LocalPort 1308 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1308 used for?

Port 1308 is assigned by IANA to odsi (Optical Domain Service Interconnect (ODSI)).

Is port 1308 TCP or UDP?

Port 1308 is registered for TCP and UDP.

Is it safe to open port 1308?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 1308 is open?

On Linux run "ss -ltnup 'sport = :1308'", on macOS "lsof -nP -i :1308", and on Windows "netstat -ano | findstr :1308" to see the local process. From another machine, "nmap -p 1308 <host>" shows whether it is reachable.

05 Related
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