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Port 610 (npmp-local)

IANA assigns port 610 to npmp-local.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
npmp-local TCP npmp-local - -
npmp-local UDP npmp-local - -

Check what is listening on port 610

Linux: is anything listening on TCP 610?
sudo ss -tlnp 'sport = :610'
Linux: UDP 610
sudo ss -ulnp 'sport = :610'
Linux / macOS: which process owns the port
sudo lsof -nP -i :610
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':610 '
Windows (Command Prompt)
netstat -ano | findstr :610
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 610 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 610
From Windows
Test-NetConnection HOST -Port 610
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 610

Block port 610 in the firewall

ufw
sudo ufw deny 610/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 610 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 610 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 610' -Direction Inbound -Protocol TCP -LocalPort 610 -Action Block
ufw
sudo ufw deny 610/udp
iptables
sudo iptables -A INPUT -p udp --dport 610 -j DROP
nftables
sudo nft add rule inet filter input udp dport 610 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 610' -Direction Inbound -Protocol UDP -LocalPort 610 -Action Block

Related ports

608sift-uft609npmp-trap611npmp-gui612hmmp-ind

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