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// Other services

Port 1113: Licklider Transmission Protocol

Port 1113 is assigned by IANA to ltp-deepspace (Licklider Transmission Protocol).

1113

How ltp-deepspace works

Other services
client:1113ltp-deepspaceresponse client:1113ltp-deepspaceresponse

The client sends a request to port 1113 and the ltp-deepspace service answers.

Transport
TCP · UDP · DCCP
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 1113 dangerous?

We have no specific security note for port 1113. 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 1113

ServicePortTransportDescriptionReferenceUpdated
ltp-deepspace 1113 TCP, UDP, DCCP Licklider Transmission Protocol RFC 5326 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1113, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1113'      # process listening on 1113
sudo lsof -nP -i :1113

macOS

sudo lsof -nP -i :1113

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1113 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1113
netstat -ano | findstr :1113

From another machine

nmap -p 1113 -sV <host>
sudo nmap -sU -p 1113 <host>
nc -zv <host> 1113

Block it in the firewall

sudo ufw deny 1113/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1113" -Direction Inbound -LocalPort 1113 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1113 used for?

Port 1113 is assigned by IANA to ltp-deepspace (Licklider Transmission Protocol).

Is port 1113 TCP or UDP?

Port 1113 is registered for TCP and UDP and DCCP.

Is it safe to open port 1113?

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 1113 is open?

On Linux run "ss -ltnup 'sport = :1113'", on macOS "lsof -nP -i :1113", and on Windows "netstat -ano | findstr :1113" to see the local process. From another machine, "nmap -p 1113 <host>" shows whether it is reachable.

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