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// Network services

Port 5319: Roughtime time synchronization

Port 5319 is assigned by IANA to roughtime (Roughtime time synchronization).

5319

How roughtime works

Network services
client:5319roughtimeresponse client:5319roughtimeresponse

The client sends a request to port 5319 and the roughtime 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 5319 dangerous?

We have no specific security note for port 5319. 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 5319

ServicePortTransportDescriptionReferenceUpdated
roughtime 5319 TCP, UDP Roughtime time synchronization RFC 10049 2026-03-27

// source: IANA service name and port number registry

03 Check it

Which program uses port 5319, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5319'      # process listening on 5319
sudo lsof -nP -i :5319

macOS

sudo lsof -nP -i :5319

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5319 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5319
netstat -ano | findstr :5319

From another machine

nmap -p 5319 -sV <host>
sudo nmap -sU -p 5319 <host>
nc -zv <host> 5319

Block it in the firewall

sudo ufw deny 5319/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5319" -Direction Inbound -LocalPort 5319 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5319 used for?

Port 5319 is assigned by IANA to roughtime (Roughtime time synchronization).

Is port 5319 TCP or UDP?

Port 5319 is registered for TCP and UDP.

Is it safe to open port 5319?

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 5319 is open?

On Linux run "ss -ltnup 'sport = :5319'", on macOS "lsof -nP -i :5319", and on Windows "netstat -ano | findstr :5319" to see the local process. From another machine, "nmap -p 5319 <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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