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Port 2155 (brdptc)

IANA assigns port 2155 to brdptc: Bridge Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
brdptc TCP Bridge Protocol Hideki Hatta -
brdptc UDP Bridge Protocol Hideki Hatta -

Registry dates for this port: registered 2007-09-27.

Check what is listening on port 2155

Linux: is anything listening on TCP 2155?
sudo ss -tlnp 'sport = :2155'
Linux: UDP 2155
sudo ss -ulnp 'sport = :2155'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2155
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2155 '
Windows (Command Prompt)
netstat -ano | findstr :2155
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2155 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2155
From Windows
Test-NetConnection HOST -Port 2155
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2155

Block port 2155 in the firewall

ufw
sudo ufw deny 2155/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2155 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2155 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2155' -Direction Inbound -Protocol TCP -LocalPort 2155 -Action Block
ufw
sudo ufw deny 2155/udp
iptables
sudo iptables -A INPUT -p udp --dport 2155 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2155 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2155' -Direction Inbound -Protocol UDP -LocalPort 2155 -Action Block

Related ports

2153ctlptc2154stdptc2156trp2157xnds

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