CyberHunter
Local dataset, no network
// Other services

Port 5272: PK

Port 5272 is assigned by IANA to pk (PK).

5272

How pk works

Other services
client:5272pkresponse client:5272pkresponse

The client sends a request to port 5272 and the pk 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 5272 dangerous?

We have no specific security note for port 5272. 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 5272

ServicePortTransportDescriptionReferenceUpdated
pk 5272 TCP, UDP PK - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5272, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5272'      # process listening on 5272
sudo lsof -nP -i :5272

macOS

sudo lsof -nP -i :5272

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5272 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5272
netstat -ano | findstr :5272

From another machine

nmap -p 5272 -sV <host>
sudo nmap -sU -p 5272 <host>
nc -zv <host> 5272

Block it in the firewall

sudo ufw deny 5272/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5272" -Direction Inbound -LocalPort 5272 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5272 used for?

Port 5272 is assigned by IANA to pk (PK).

Is port 5272 TCP or UDP?

Port 5272 is registered for TCP and UDP.

Is it safe to open port 5272?

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 5272 is open?

On Linux run "ss -ltnup 'sport = :5272'", on macOS "lsof -nP -i :5272", and on Windows "netstat -ano | findstr :5272" to see the local process. From another machine, "nmap -p 5272 <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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