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// Network services

Port 17220: IEEE 1722 Transport Protocol for Time Sensitive Applications

Port 17220 is assigned by IANA to avtp (IEEE 1722 Transport Protocol for Time Sensitive Applications).

17220

How avtp works

Network services
client:17220avtpresponse client:17220avtpresponse

The client sends a request to port 17220 and the avtp 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
Network services
01 Security

Is port 17220 dangerous?

We have no specific security note for port 17220. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 17220

ServicePortTransportDescriptionReferenceUpdated
avtp 17220 TCP, UDP IEEE 1722 Transport Protocol for Time Sensitive Applications - 2014-03-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 17220, and is it reachable?

Linux

sudo ss -ltnup 'sport = :17220'      # process listening on 17220
sudo lsof -nP -i :17220

macOS

sudo lsof -nP -i :17220

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 17220 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 17220
netstat -ano | findstr :17220

From another machine

nmap -p 17220 -sV <host>
sudo nmap -sU -p 17220 <host>
nc -zv <host> 17220

Block it in the firewall

sudo ufw deny 17220/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 17220" -Direction Inbound -LocalPort 17220 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 17220 used for?

Port 17220 is assigned by IANA to avtp (IEEE 1722 Transport Protocol for Time Sensitive Applications).

Is port 17220 TCP or UDP?

Port 17220 is registered for TCP and UDP.

Is it safe to open port 17220?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 17220 is open?

On Linux run "ss -ltnup 'sport = :17220'", on macOS "lsof -nP -i :17220", and on Windows "netstat -ano | findstr :17220" to see the local process. From another machine, "nmap -p 17220 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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