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Port 1506 (utcd)

IANA assigns port 1506 to utcd: Universal Time daemon (utcd).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
utcd TCP Universal Time daemon (utcd) Walter Poxon -
utcd UDP Universal Time daemon (utcd) Walter Poxon -

Check what is listening on port 1506

Linux: is anything listening on TCP 1506?
sudo ss -tlnp 'sport = :1506'
Linux: UDP 1506
sudo ss -ulnp 'sport = :1506'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1506
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1506 '
Windows (Command Prompt)
netstat -ano | findstr :1506
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1506 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1506
From Windows
Test-NetConnection HOST -Port 1506
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1506

Block port 1506 in the firewall

ufw
sudo ufw deny 1506/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1506 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1506 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1506' -Direction Inbound -Protocol TCP -LocalPort 1506 -Action Block
ufw
sudo ufw deny 1506/udp
iptables
sudo iptables -A INPUT -p udp --dport 1506 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1506 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1506' -Direction Inbound -Protocol UDP -LocalPort 1506 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.