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// Other services

Port 10500: HIP NAT-Traversal

Port 10500 is assigned by IANA to hip-nat-t (HIP NAT-Traversal).

10500

How hip-nat-t works

Other services
client:10500hip-nat-tresponse client:10500hip-nat-tresponse

The client sends a request to port 10500 and the hip-nat-t service answers.

Transport
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 10500 dangerous?

We have no specific security note for port 10500. 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 10500

ServicePortTransportDescriptionReferenceUpdated
hip-nat-t 10500 UDP HIP NAT-Traversal RFC 5770, RFC 9028 2020-08-12
-10500-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 10500, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10500'      # process listening on 10500
sudo lsof -nP -i :10500

macOS

sudo lsof -nP -i :10500

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10500 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10500
netstat -ano | findstr :10500

From another machine

nmap -p 10500 -sV <host>
sudo nmap -sU -p 10500 <host>
nc -zv <host> 10500

Block it in the firewall

sudo ufw deny 10500/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10500" -Direction Inbound -LocalPort 10500 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 10500 used for?

Port 10500 is assigned by IANA to hip-nat-t (HIP NAT-Traversal).

Is port 10500 TCP or UDP?

Port 10500 is registered for UDP.

Is it safe to open port 10500?

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 10500 is open?

On Linux run "ss -ltnup 'sport = :10500'", on macOS "lsof -nP -i :10500", and on Windows "netstat -ano | findstr :10500" to see the local process. From another machine, "nmap -p 10500 <host>" shows whether it is reachable.

05 Related
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