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Port 2265 (apx500api-2)

IANA assigns port 2265 to apx500api-2: Audio Precision Apx500 API Port 2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apx500api-2 TCP Audio Precision Apx500 API Port 2 Robert Wright -
apx500api-2 UDP Audio Precision Apx500 API Port 2 Robert Wright -

Check what is listening on port 2265

Linux: is anything listening on TCP 2265?
sudo ss -tlnp 'sport = :2265'
Linux: UDP 2265
sudo ss -ulnp 'sport = :2265'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2265
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2265 '
Windows (Command Prompt)
netstat -ano | findstr :2265
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2265 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2265
From Windows
Test-NetConnection HOST -Port 2265
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2265

Block port 2265 in the firewall

ufw
sudo ufw deny 2265/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2265 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2265 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2265' -Direction Inbound -Protocol TCP -LocalPort 2265 -Action Block
ufw
sudo ufw deny 2265/udp
iptables
sudo iptables -A INPUT -p udp --dport 2265 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2265 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2265' -Direction Inbound -Protocol UDP -LocalPort 2265 -Action Block

Related ports

2263ecwcfg2264apx500api-12266mfserver2267ontobroker

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