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// Other services

Port 1258: Open Network Library

Port 1258 is assigned by IANA to opennl (Open Network Library).

1258

How opennl works

Other services
client:1258opennlresponse client:1258opennlresponse

The client sends a request to port 1258 and the opennl 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 1258 dangerous?

We have no specific security note for port 1258. 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 1258

ServicePortTransportDescriptionReferenceUpdated
opennl 1258 TCP, UDP Open Network Library - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1258, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1258'      # process listening on 1258
sudo lsof -nP -i :1258

macOS

sudo lsof -nP -i :1258

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1258 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1258
netstat -ano | findstr :1258

From another machine

nmap -p 1258 -sV <host>
sudo nmap -sU -p 1258 <host>
nc -zv <host> 1258

Block it in the firewall

sudo ufw deny 1258/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1258" -Direction Inbound -LocalPort 1258 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1258 used for?

Port 1258 is assigned by IANA to opennl (Open Network Library).

Is port 1258 TCP or UDP?

Port 1258 is registered for TCP and UDP.

Is it safe to open port 1258?

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 1258 is open?

On Linux run "ss -ltnup 'sport = :1258'", on macOS "lsof -nP -i :1258", and on Windows "netstat -ano | findstr :1258" to see the local process. From another machine, "nmap -p 1258 <host>" shows whether it is reachable.

05 Related
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