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Port 4007 (pxc-splr)

IANA assigns port 4007 to pxc-splr.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pxc-splr TCP pxc-splr Dave Nesbitt -
pxc-splr UDP pxc-splr Dave Nesbitt -

Check what is listening on port 4007

Linux: is anything listening on TCP 4007?
sudo ss -tlnp 'sport = :4007'
Linux: UDP 4007
sudo ss -ulnp 'sport = :4007'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4007
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4007 '
Windows (Command Prompt)
netstat -ano | findstr :4007
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4007 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4007
From Windows
Test-NetConnection HOST -Port 4007
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4007

Block port 4007 in the firewall

ufw
sudo ufw deny 4007/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4007 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4007 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4007' -Direction Inbound -Protocol TCP -LocalPort 4007 -Action Block
ufw
sudo ufw deny 4007/udp
iptables
sudo iptables -A INPUT -p udp --dport 4007 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4007 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4007' -Direction Inbound -Protocol UDP -LocalPort 4007 -Action Block

Related ports

4005pxc-pin4006pxc-spvr4008netcheque4009chimera-hwm

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