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Port 6161 (patrol-ism)

IANA assigns port 6161 to patrol-ism: PATROL Internet Srv Mgr.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
patrol-ism TCP PATROL Internet Srv Mgr Portnoy Boxman -
patrol-ism UDP PATROL Internet Srv Mgr Portnoy Boxman -

Registry dates for this port: registered 2005-01.

Check what is listening on port 6161

Linux: is anything listening on TCP 6161?
sudo ss -tlnp 'sport = :6161'
Linux: UDP 6161
sudo ss -ulnp 'sport = :6161'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6161
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6161 '
Windows (Command Prompt)
netstat -ano | findstr :6161
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6161 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6161
From Windows
Test-NetConnection HOST -Port 6161
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6161

Block port 6161 in the firewall

ufw
sudo ufw deny 6161/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6161 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6161 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6161' -Direction Inbound -Protocol TCP -LocalPort 6161 -Action Block
ufw
sudo ufw deny 6161/udp
iptables
sudo iptables -A INPUT -p udp --dport 6161 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6161 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6161' -Direction Inbound -Protocol UDP -LocalPort 6161 -Action Block

Related ports

6159efb-aci6160ecmp, ecmp-data6162patrol-coll6163pscribe

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.