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// Network services

Port 4173: MMA Device Discovery

Port 4173 is assigned by IANA to mma-discovery (MMA Device Discovery).

4173

How mma-discovery works

Network services
client:4173mma-discoveryresponse client:4173mma-discoveryresponse

The client sends a request to port 4173 and the mma-discovery service answers.

Transport
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 4173 dangerous?

We have no specific security note for port 4173. 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 4173

ServicePortTransportDescriptionReferenceUpdated
mma-discovery 4173 UDP MMA Device Discovery - 2011-11-14
-4173-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4173, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4173'      # process listening on 4173
sudo lsof -nP -i :4173

macOS

sudo lsof -nP -i :4173

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4173 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4173
netstat -ano | findstr :4173

From another machine

nmap -p 4173 -sV <host>
sudo nmap -sU -p 4173 <host>
nc -zv <host> 4173

Block it in the firewall

sudo ufw deny 4173/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4173" -Direction Inbound -LocalPort 4173 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4173 used for?

Port 4173 is assigned by IANA to mma-discovery (MMA Device Discovery).

Is port 4173 TCP or UDP?

Port 4173 is registered for UDP.

Is it safe to open port 4173?

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 4173 is open?

On Linux run "ss -ltnup 'sport = :4173'", on macOS "lsof -nP -i :4173", and on Windows "netstat -ano | findstr :4173" to see the local process. From another machine, "nmap -p 4173 <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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