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// Other services

Port 10253: Relay of EAPOL frames

Port 10253 is assigned by IANA to eapol-relay (Relay of EAPOL frames).

10253

How eapol-relay works

Other services
client:10253eapol-relayresponse client:10253eapol-relayresponse

The client sends a request to port 10253 and the eapol-relay 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 10253 dangerous?

We have no specific security note for port 10253. 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 10253

ServicePortTransportDescriptionReferenceUpdated
eapol-relay 10253 UDP Relay of EAPOL frames - 2015-06-26
-10253-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 10253, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10253'      # process listening on 10253
sudo lsof -nP -i :10253

macOS

sudo lsof -nP -i :10253

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10253 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10253
netstat -ano | findstr :10253

From another machine

nmap -p 10253 -sV <host>
sudo nmap -sU -p 10253 <host>
nc -zv <host> 10253

Block it in the firewall

sudo ufw deny 10253/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10253" -Direction Inbound -LocalPort 10253 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 10253 used for?

Port 10253 is assigned by IANA to eapol-relay (Relay of EAPOL frames).

Is port 10253 TCP or UDP?

Port 10253 is registered for UDP.

Is it safe to open port 10253?

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 10253 is open?

On Linux run "ss -ltnup 'sport = :10253'", on macOS "lsof -nP -i :10253", and on Windows "netstat -ano | findstr :10253" to see the local process. From another machine, "nmap -p 10253 <host>" shows whether it is reachable.

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