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Port 9950 (apc-9950)

IANA assigns port 9950 to apc-9950: APC 9950.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apc-9950 TCP APC 9950 American Power Conve -
apc-9950 UDP APC 9950 American Power Conve -

Check what is listening on port 9950

Linux: is anything listening on TCP 9950?
sudo ss -tlnp 'sport = :9950'
Linux: UDP 9950
sudo ss -ulnp 'sport = :9950'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9950
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9950 '
Windows (Command Prompt)
netstat -ano | findstr :9950
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9950 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9950
From Windows
Test-NetConnection HOST -Port 9950
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9950

Block port 9950 in the firewall

ufw
sudo ufw deny 9950/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9950 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9950 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9950' -Direction Inbound -Protocol TCP -LocalPort 9950 -Action Block
ufw
sudo ufw deny 9950/udp
iptables
sudo iptables -A INPUT -p udp --dport 9950 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9950 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9950' -Direction Inbound -Protocol UDP -LocalPort 9950 -Action Block

Related ports

9911sype-transport9925xybrid-cloud9951apc-99519952apc-9952

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