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// Other services

Port 15740: Picture Transfer Protocol

Port 15740 is assigned by IANA to ptp (Picture Transfer Protocol).

15740

How ptp works

Other services
client:15740ptpresponse client:15740ptpresponse

The client sends a request to port 15740 and the ptp 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 15740 dangerous?

We have no specific security note for port 15740. 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 15740

ServicePortTransportDescriptionReferenceUpdated
ptp 15740 TCP, UDP Picture Transfer Protocol - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 15740, and is it reachable?

Linux

sudo ss -ltnup 'sport = :15740'      # process listening on 15740
sudo lsof -nP -i :15740

macOS

sudo lsof -nP -i :15740

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 15740 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 15740
netstat -ano | findstr :15740

From another machine

nmap -p 15740 -sV <host>
sudo nmap -sU -p 15740 <host>
nc -zv <host> 15740

Block it in the firewall

sudo ufw deny 15740/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 15740" -Direction Inbound -LocalPort 15740 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 15740 used for?

Port 15740 is assigned by IANA to ptp (Picture Transfer Protocol).

Is port 15740 TCP or UDP?

Port 15740 is registered for TCP and UDP.

Is it safe to open port 15740?

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 15740 is open?

On Linux run "ss -ltnup 'sport = :15740'", on macOS "lsof -nP -i :15740", and on Windows "netstat -ano | findstr :15740" to see the local process. From another machine, "nmap -p 15740 <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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