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Port 912 (apex-mesh)

IANA assigns port 912 to apex-mesh: APEX relay-relay service.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
apex-mesh TCP APEX relay-relay service - -
apex-mesh UDP APEX relay-relay service - -

Check what is listening on port 912

Linux: is anything listening on TCP 912?
sudo ss -tlnp 'sport = :912'
Linux: UDP 912
sudo ss -ulnp 'sport = :912'
Linux / macOS: which process owns the port
sudo lsof -nP -i :912
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':912 '
Windows (Command Prompt)
netstat -ano | findstr :912
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 912 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 912
From Windows
Test-NetConnection HOST -Port 912
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 912

Block port 912 in the firewall

ufw
sudo ufw deny 912/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 912 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 912 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 912' -Direction Inbound -Protocol TCP -LocalPort 912 -Action Block
ufw
sudo ufw deny 912/udp
iptables
sudo iptables -A INPUT -p udp --dport 912 -j DROP
nftables
sudo nft add rule inet filter input udp dport 912 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 912' -Direction Inbound -Protocol UDP -LocalPort 912 -Action Block

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