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// Other services

Port 912: APEX relay-relay service

Port 912 is assigned by IANA to apex-mesh (APEX relay-relay service).

912

How apex-mesh works

Other services
client:912apex-meshresponse client:912apex-meshresponse

The client sends a request to port 912 and the apex-mesh 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 912 dangerous?

We have no specific security note for port 912. 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 912

ServicePortTransportDescriptionReferenceUpdated
apex-mesh 912 TCP, UDP APEX relay-relay service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 912, and is it reachable?

Linux

sudo ss -ltnup 'sport = :912'      # process listening on 912
sudo lsof -nP -i :912

macOS

sudo lsof -nP -i :912

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 912 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 912
netstat -ano | findstr :912

From another machine

nmap -p 912 -sV <host>
sudo nmap -sU -p 912 <host>
nc -zv <host> 912

Block it in the firewall

sudo ufw deny 912/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 912" -Direction Inbound -LocalPort 912 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 912 used for?

Port 912 is assigned by IANA to apex-mesh (APEX relay-relay service).

Is port 912 TCP or UDP?

Port 912 is registered for TCP and UDP.

Is it safe to open port 912?

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 912 is open?

On Linux run "ss -ltnup 'sport = :912'", on macOS "lsof -nP -i :912", and on Windows "netstat -ano | findstr :912" to see the local process. From another machine, "nmap -p 912 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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