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Port 2161 (apc-2161)

IANA assigns port 2161 to apc-2161: APC 2161.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apc-2161 TCP APC 2161 American Power Conve -
apc-2161 UDP APC 2161 American Power Conve -

Check what is listening on port 2161

Linux: is anything listening on TCP 2161?
sudo ss -tlnp 'sport = :2161'
Linux: UDP 2161
sudo ss -ulnp 'sport = :2161'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2161
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2161 '
Windows (Command Prompt)
netstat -ano | findstr :2161
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2161 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2161
From Windows
Test-NetConnection HOST -Port 2161
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2161

Block port 2161 in the firewall

ufw
sudo ufw deny 2161/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2161 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2161 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2161' -Direction Inbound -Protocol TCP -LocalPort 2161 -Action Block
ufw
sudo ufw deny 2161/udp
iptables
sudo iptables -A INPUT -p udp --dport 2161 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2161 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2161' -Direction Inbound -Protocol UDP -LocalPort 2161 -Action Block

Related ports

2159gdbremote2160apc-21602162navisphere2163navisphere-sec

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