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Port 5343 (kfserver)

IANA assigns port 5343 to kfserver: Sculptor Database Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
kfserver TCP Sculptor Database Server Keith Ashman -
kfserver UDP Sculptor Database Server Keith Ashman -

Registry dates for this port: registered 2005-12.

Check what is listening on port 5343

Linux: is anything listening on TCP 5343?
sudo ss -tlnp 'sport = :5343'
Linux: UDP 5343
sudo ss -ulnp 'sport = :5343'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5343
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5343 '
Windows (Command Prompt)
netstat -ano | findstr :5343
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5343 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5343
From Windows
Test-NetConnection HOST -Port 5343
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5343

Block port 5343 in the firewall

ufw
sudo ufw deny 5343/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5343 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5343 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5343' -Direction Inbound -Protocol TCP -LocalPort 5343 -Action Block
ufw
sudo ufw deny 5343/udp
iptables
sudo iptables -A INPUT -p udp --dport 5343 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5343 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5343' -Direction Inbound -Protocol UDP -LocalPort 5343 -Action Block

Related ports

5320bsfserver-zn5321bsfsvr-zn-ssl5344xkotodrcp5349STUN / TURN over TLS

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