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Port 5684 (coaps)

IANA assigns port 5684 to coaps: Constrained Application Protocol (CoAP).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
coaps TCP Constrained Application Protocol (CoAP) IESG RFC 7301, RFC 8323
coaps UDP DTLS-secured CoAP IESG RFC 7252

Registry dates for this port: registered 2013-07-25.

Check what is listening on port 5684

Linux: is anything listening on TCP 5684?
sudo ss -tlnp 'sport = :5684'
Linux: UDP 5684
sudo ss -ulnp 'sport = :5684'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5684
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5684 '
Windows (Command Prompt)
netstat -ano | findstr :5684
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5684 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5684
From Windows
Test-NetConnection HOST -Port 5684
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5684

Block port 5684 in the firewall

ufw
sudo ufw deny 5684/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5684 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5684 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5684' -Direction Inbound -Protocol TCP -LocalPort 5684 -Action Block
ufw
sudo ufw deny 5684/udp
iptables
sudo iptables -A INPUT -p udp --dport 5684 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5684 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5684' -Direction Inbound -Protocol UDP -LocalPort 5684 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.