- 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.
Port 103: Genesis Point-to-Point Trans Net
Port 103 is assigned by IANA to gppitnp (Genesis Point-to-Point Trans Net).
103
How gppitnp works
Other servicesThe client sends a request to port 103 and the gppitnp 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
Is port 103 dangerous?
We have no specific security note for port 103. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 103
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| gppitnp | 103 | TCP, UDP | Genesis Point-to-Point Trans Net | - | - |
// source: IANA service name and port number registry
Which program uses port 103, and is it reachable?
Linux
sudo ss -ltnup 'sport = :103' # process listening on 103
sudo lsof -nP -i :103macOS
sudo lsof -nP -i :103
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 103 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 103 netstat -ano | findstr :103
From another machine
nmap -p 103 -sV <host> sudo nmap -sU -p 103 <host> nc -zv <host> 103
Block it in the firewall
sudo ufw deny 103/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 103" -Direction Inbound -LocalPort 103 -Protocol TCP -Action Block # Windows
What is port 103 used for?
Port 103 is assigned by IANA to gppitnp (Genesis Point-to-Point Trans Net).
Is port 103 TCP or UDP?
Port 103 is registered for TCP and UDP.
Is it safe to open port 103?
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 103 is open?
On Linux run "ss -ltnup 'sport = :103'", on macOS "lsof -nP -i :103", and on Windows "netstat -ano | findstr :103" to see the local process. From another machine, "nmap -p 103 <host>" shows whether it is reachable.
Other other services ports
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