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Port 4343 (unicall)

IANA assigns port 4343 to unicall: UNICALL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
unicall TCP UNICALL James Powell 2 -
unicall UDP UNICALL James Powell 2 -

Check what is listening on port 4343

Linux: is anything listening on TCP 4343?
sudo ss -tlnp 'sport = :4343'
Linux: UDP 4343
sudo ss -ulnp 'sport = :4343'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4343
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4343 '
Windows (Command Prompt)
netstat -ano | findstr :4343
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4343 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4343
From Windows
Test-NetConnection HOST -Port 4343
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4343

Block port 4343 in the firewall

ufw
sudo ufw deny 4343/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4343 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4343 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4343' -Direction Inbound -Protocol TCP -LocalPort 4343 -Action Block
ufw
sudo ufw deny 4343/udp
iptables
sudo iptables -A INPUT -p udp --dport 4343 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4343 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4343' -Direction Inbound -Protocol UDP -LocalPort 4343 -Action Block

Related ports

4341lisp-data4342lisp-control4344vinainstall4345m4-network-as

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