CyberHunter
Local dataset, no network
// Other services

Port 10252: Apollo Relay Port

Port 10252 is assigned by IANA to apollo-relay (Apollo Relay Port).

10252

How apollo-relay works

Other services
client:10252apollo-relayresponse client:10252apollo-relayresponse

The client sends a request to port 10252 and the apollo-relay 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 10252 dangerous?

We have no specific security note for port 10252. 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 10252

ServicePortTransportDescriptionReferenceUpdated
apollo-relay 10252 TCP, UDP Apollo Relay Port - 2003-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 10252, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10252'      # process listening on 10252
sudo lsof -nP -i :10252

macOS

sudo lsof -nP -i :10252

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10252 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10252
netstat -ano | findstr :10252

From another machine

nmap -p 10252 -sV <host>
sudo nmap -sU -p 10252 <host>
nc -zv <host> 10252

Block it in the firewall

sudo ufw deny 10252/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10252" -Direction Inbound -LocalPort 10252 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 10252 used for?

Port 10252 is assigned by IANA to apollo-relay (Apollo Relay Port).

Is port 10252 TCP or UDP?

Port 10252 is registered for TCP and UDP.

Is it safe to open port 10252?

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 10252 is open?

On Linux run "ss -ltnup 'sport = :10252'", on macOS "lsof -nP -i :10252", and on Windows "netstat -ano | findstr :10252" to see the local process. From another machine, "nmap -p 10252 <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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