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Port 2605 (nsc-posa)

IANA assigns port 2605 to nsc-posa: NSC POSA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nsc-posa TCP NSC POSA Tom Findley -
nsc-posa UDP NSC POSA Tom Findley -

Check what is listening on port 2605

Linux: is anything listening on TCP 2605?
sudo ss -tlnp 'sport = :2605'
Linux: UDP 2605
sudo ss -ulnp 'sport = :2605'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2605
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2605 '
Windows (Command Prompt)
netstat -ano | findstr :2605
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2605 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2605
From Windows
Test-NetConnection HOST -Port 2605
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2605

Block port 2605 in the firewall

ufw
sudo ufw deny 2605/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2605 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2605 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2605' -Direction Inbound -Protocol TCP -LocalPort 2605 -Action Block
ufw
sudo ufw deny 2605/udp
iptables
sudo iptables -A INPUT -p udp --dport 2605 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2605 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2605' -Direction Inbound -Protocol UDP -LocalPort 2605 -Action Block

Related ports

2603servicemeter2604nsc-ccs2606netmon2607connection

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