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// Other services

Port 913: APEX endpoint-relay service

Port 913 is assigned by IANA to apex-edge (APEX endpoint-relay service).

913

How apex-edge works

Other services
client:913apex-edgeresponse client:913apex-edgeresponse

The client sends a request to port 913 and the apex-edge 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
01 Security

Is port 913 dangerous?

We have no specific security note for port 913. 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 913

ServicePortTransportDescriptionReferenceUpdated
apex-edge 913 TCP, UDP APEX endpoint-relay service RFC 3340 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 913, and is it reachable?

Linux

sudo ss -ltnup 'sport = :913'      # process listening on 913
sudo lsof -nP -i :913

macOS

sudo lsof -nP -i :913

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 913 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 913
netstat -ano | findstr :913

From another machine

nmap -p 913 -sV <host>
sudo nmap -sU -p 913 <host>
nc -zv <host> 913

Block it in the firewall

sudo ufw deny 913/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 913" -Direction Inbound -LocalPort 913 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 913 used for?

Port 913 is assigned by IANA to apex-edge (APEX endpoint-relay service).

Is port 913 TCP or UDP?

Port 913 is registered for TCP and UDP.

Is it safe to open port 913?

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 913 is open?

On Linux run "ss -ltnup 'sport = :913'", on macOS "lsof -nP -i :913", and on Windows "netstat -ano | findstr :913" to see the local process. From another machine, "nmap -p 913 <host>" shows whether it is reachable.

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