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Port 155 (netsc-dev)

IANA assigns port 155 to netsc-dev: NETSC.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
netsc-dev TCP NETSC Sergio Heker -
netsc-dev UDP NETSC Sergio Heker -

Check what is listening on port 155

Linux: is anything listening on TCP 155?
sudo ss -tlnp 'sport = :155'
Linux: UDP 155
sudo ss -ulnp 'sport = :155'
Linux / macOS: which process owns the port
sudo lsof -nP -i :155
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':155 '
Windows (Command Prompt)
netstat -ano | findstr :155
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 155 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 155
From Windows
Test-NetConnection HOST -Port 155
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 155

Block port 155 in the firewall

ufw
sudo ufw deny 155/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 155 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 155 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 155' -Direction Inbound -Protocol TCP -LocalPort 155 -Action Block
ufw
sudo ufw deny 155/udp
iptables
sudo iptables -A INPUT -p udp --dport 155 -j DROP
nftables
sudo nft add rule inet filter input udp dport 155 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 155' -Direction Inbound -Protocol UDP -LocalPort 155 -Action Block

Related ports

153sgmp154netsc-prod156sqlsrv157knet-cmp

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