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Port 2743 (murx)

IANA assigns port 2743 to murx.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
murx TCP murx Thomas Kuiper -
murx UDP murx Thomas Kuiper -

Check what is listening on port 2743

Linux: is anything listening on TCP 2743?
sudo ss -tlnp 'sport = :2743'
Linux: UDP 2743
sudo ss -ulnp 'sport = :2743'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2743
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2743 '
Windows (Command Prompt)
netstat -ano | findstr :2743
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2743 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2743
From Windows
Test-NetConnection HOST -Port 2743
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2743

Block port 2743 in the firewall

ufw
sudo ufw deny 2743/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2743 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2743 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2743' -Direction Inbound -Protocol TCP -LocalPort 2743 -Action Block
ufw
sudo ufw deny 2743/udp
iptables
sudo iptables -A INPUT -p udp --dport 2743 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2743 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2743' -Direction Inbound -Protocol UDP -LocalPort 2743 -Action Block

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