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Port 4349 (fsportmap)

IANA assigns port 4349 to fsportmap: File System Port Map.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fsportmap TCP File System Port Map Ron Minnich 2 -
fsportmap UDP File System Port Map Ron Minnich 2 -

Check what is listening on port 4349

Linux: is anything listening on TCP 4349?
sudo ss -tlnp 'sport = :4349'
Linux: UDP 4349
sudo ss -ulnp 'sport = :4349'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4349
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4349 '
Windows (Command Prompt)
netstat -ano | findstr :4349
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4349 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4349
From Windows
Test-NetConnection HOST -Port 4349
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4349

Block port 4349 in the firewall

ufw
sudo ufw deny 4349/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4349 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4349 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4349' -Direction Inbound -Protocol TCP -LocalPort 4349 -Action Block
ufw
sudo ufw deny 4349/udp
iptables
sudo iptables -A INPUT -p udp --dport 4349 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4349 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4349' -Direction Inbound -Protocol UDP -LocalPort 4349 -Action Block

Related ports

4347lansurveyor4348itose4350net-device4351plcy-net-svcs

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