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Port 6111 (spc)

IANA assigns port 6111 to spc: HP SoftBench Sub-Process Control.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
spc TCP HP SoftBench Sub-Process Control Scott A Kramer -
spc UDP HP SoftBench Sub-Process Control Scott A Kramer -

Check what is listening on port 6111

Linux: is anything listening on TCP 6111?
sudo ss -tlnp 'sport = :6111'
Linux: UDP 6111
sudo ss -ulnp 'sport = :6111'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6111
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6111 '
Windows (Command Prompt)
netstat -ano | findstr :6111
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6111 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6111
From Windows
Test-NetConnection HOST -Port 6111
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6111

Block port 6111 in the firewall

ufw
sudo ufw deny 6111/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6111 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6111 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6111' -Direction Inbound -Protocol TCP -LocalPort 6111 -Action Block
ufw
sudo ufw deny 6111/udp
iptables
sudo iptables -A INPUT -p udp --dport 6111 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6111 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6111' -Direction Inbound -Protocol UDP -LocalPort 6111 -Action Block

Related ports

6109globecast-id6110softcm6112dtspcd6113dayliteserver

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