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Port 1538 (3ds-lm)

IANA assigns port 1538 to 3ds-lm.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
3ds-lm TCP 3ds-lm Keith Trummel -
3ds-lm UDP 3ds-lm Keith Trummel -

Check what is listening on port 1538

Linux: is anything listening on TCP 1538?
sudo ss -tlnp 'sport = :1538'
Linux: UDP 1538
sudo ss -ulnp 'sport = :1538'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1538
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1538 '
Windows (Command Prompt)
netstat -ano | findstr :1538
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1538 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1538
From Windows
Test-NetConnection HOST -Port 1538
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1538

Block port 1538 in the firewall

ufw
sudo ufw deny 1538/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1538 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1538 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1538' -Direction Inbound -Protocol TCP -LocalPort 1538 -Action Block
ufw
sudo ufw deny 1538/udp
iptables
sudo iptables -A INPUT -p udp --dport 1538 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1538 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1538' -Direction Inbound -Protocol UDP -LocalPort 1538 -Action Block

Related ports

1536ampr-inter1537sdsc-lm1539intellistor-lm1540rds

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