CyberHunter
Local dataset, no network
// Other services

Port 481: Ph service

Port 481 is assigned by IANA to ph (Ph service).

481

How ph works

Other services
client:481phresponse client:481phresponse

The client sends a request to port 481 and the ph 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 481 dangerous?

We have no specific security note for port 481. 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 481

ServicePortTransportDescriptionReferenceUpdated
ph 481 TCP, UDP Ph service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 481, and is it reachable?

Linux

sudo ss -ltnup 'sport = :481'      # process listening on 481
sudo lsof -nP -i :481

macOS

sudo lsof -nP -i :481

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 481 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 481
netstat -ano | findstr :481

From another machine

nmap -p 481 -sV <host>
sudo nmap -sU -p 481 <host>
nc -zv <host> 481

Block it in the firewall

sudo ufw deny 481/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 481" -Direction Inbound -LocalPort 481 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 481 used for?

Port 481 is assigned by IANA to ph (Ph service).

Is port 481 TCP or UDP?

Port 481 is registered for TCP and UDP.

Is it safe to open port 481?

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 481 is open?

On Linux run "ss -ltnup 'sport = :481'", on macOS "lsof -nP -i :481", and on Windows "netstat -ano | findstr :481" to see the local process. From another machine, "nmap -p 481 <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

Latest vulnerability news

All news