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Port 4059 (dlms-cosem)

IANA assigns port 4059 to dlms-cosem: DLMS/COSEM.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dlms-cosem TCP DLMS/COSEM Gyozo Kmethy -
dlms-cosem UDP DLMS/COSEM Gyozo Kmethy -

Registry dates for this port: registered 2006-11.

Check what is listening on port 4059

Linux: is anything listening on TCP 4059?
sudo ss -tlnp 'sport = :4059'
Linux: UDP 4059
sudo ss -ulnp 'sport = :4059'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4059
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4059 '
Windows (Command Prompt)
netstat -ano | findstr :4059
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4059 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4059
From Windows
Test-NetConnection HOST -Port 4059
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4059

Block port 4059 in the firewall

ufw
sudo ufw deny 4059/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4059 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4059 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4059' -Direction Inbound -Protocol TCP -LocalPort 4059 -Action Block
ufw
sudo ufw deny 4059/udp
iptables
sudo iptables -A INPUT -p udp --dport 4059 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4059 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4059' -Direction Inbound -Protocol UDP -LocalPort 4059 -Action Block

Related ports

4057wfm4058kingfisher4060dsmeter-iatc, dsmeter_iatc4061ice-location

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