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Port 134 (ingres-net)

IANA assigns port 134 to ingres-net: INGRES-NET Service.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ingres-net TCP INGRES-NET Service Mike Berrow -
ingres-net UDP INGRES-NET Service Mike Berrow -

Check what is listening on port 134

Linux: is anything listening on TCP 134?
sudo ss -tlnp 'sport = :134'
Linux: UDP 134
sudo ss -ulnp 'sport = :134'
Linux / macOS: which process owns the port
sudo lsof -nP -i :134
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':134 '
Windows (Command Prompt)
netstat -ano | findstr :134
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 134 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 134
From Windows
Test-NetConnection HOST -Port 134
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 134

Block port 134 in the firewall

ufw
sudo ufw deny 134/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 134 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 134 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 134' -Direction Inbound -Protocol TCP -LocalPort 134 -Action Block
ufw
sudo ufw deny 134/udp
iptables
sudo iptables -A INPUT -p udp --dport 134 -j DROP
nftables
sudo nft add rule inet filter input udp dport 134 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 134' -Direction Inbound -Protocol UDP -LocalPort 134 -Action Block

Related ports

132cisco-sys133statsrv135Microsoft RPC endpoint mapper136profile

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