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// Other services

Port 10100: VERITAS ITAP DDTP

Port 10100 is assigned by IANA to itap-ddtp (VERITAS ITAP DDTP).

10100

How itap-ddtp works

Other services
client:10100itap-ddtpresponse client:10100itap-ddtpresponse

The client sends a request to port 10100 and the itap-ddtp 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 10100 dangerous?

We have no specific security note for port 10100. 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 10100

ServicePortTransportDescriptionReferenceUpdated
itap-ddtp 10100 TCP, UDP VERITAS ITAP DDTP - 2004-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 10100, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10100'      # process listening on 10100
sudo lsof -nP -i :10100

macOS

sudo lsof -nP -i :10100

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10100 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10100
netstat -ano | findstr :10100

From another machine

nmap -p 10100 -sV <host>
sudo nmap -sU -p 10100 <host>
nc -zv <host> 10100

Block it in the firewall

sudo ufw deny 10100/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10100" -Direction Inbound -LocalPort 10100 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 10100 used for?

Port 10100 is assigned by IANA to itap-ddtp (VERITAS ITAP DDTP).

Is port 10100 TCP or UDP?

Port 10100 is registered for TCP and UDP.

Is it safe to open port 10100?

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 10100 is open?

On Linux run "ss -ltnup 'sport = :10100'", on macOS "lsof -nP -i :10100", and on Windows "netstat -ano | findstr :10100" to see the local process. From another machine, "nmap -p 10100 <host>" shows whether it is reachable.

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