HTTPfy

Port 136 (profile)

IANA assigns port 136 to profile: PROFILE Naming System.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
profile TCP PROFILE Naming System Larry Peterson -
profile UDP PROFILE Naming System Larry Peterson -

Check what is listening on port 136

Linux: is anything listening on TCP 136?
sudo ss -tlnp 'sport = :136'
Linux: UDP 136
sudo ss -ulnp 'sport = :136'
Linux / macOS: which process owns the port
sudo lsof -nP -i :136
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':136 '
Windows (Command Prompt)
netstat -ano | findstr :136
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 136 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 136
From Windows
Test-NetConnection HOST -Port 136
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 136

Block port 136 in the firewall

ufw
sudo ufw deny 136/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 136 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 136 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 136' -Direction Inbound -Protocol TCP -LocalPort 136 -Action Block
ufw
sudo ufw deny 136/udp
iptables
sudo iptables -A INPUT -p udp --dport 136 -j DROP
nftables
sudo nft add rule inet filter input udp dport 136 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 136' -Direction Inbound -Protocol UDP -LocalPort 136 -Action Block

Related ports

134ingres-net135Microsoft RPC endpoint mapper137NetBIOS Name Service138NetBIOS Datagram Service

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