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Port 4155 (bzr)

IANA assigns port 4155 to bzr: Bazaar version control system.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bzr TCP Bazaar version control system Martin Pool 2 -
bzr UDP Bazaar version control system Martin Pool 2 -

Registry dates for this port: registered 2007-02.

Check what is listening on port 4155

Linux: is anything listening on TCP 4155?
sudo ss -tlnp 'sport = :4155'
Linux: UDP 4155
sudo ss -ulnp 'sport = :4155'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4155
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4155 '
Windows (Command Prompt)
netstat -ano | findstr :4155
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4155 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4155
From Windows
Test-NetConnection HOST -Port 4155
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4155

Block port 4155 in the firewall

ufw
sudo ufw deny 4155/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4155 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4155 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4155' -Direction Inbound -Protocol TCP -LocalPort 4155 -Action Block
ufw
sudo ufw deny 4155/udp
iptables
sudo iptables -A INPUT -p udp --dport 4155 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4155 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4155' -Direction Inbound -Protocol UDP -LocalPort 4155 -Action Block

Related ports

4153mbl-battd4154atlinks4156stat-results4157stat-scanner

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.