Port 4155Bazaar Smart Server

Bazaar's smart version-control service, normally reached over TCP for remote repository access.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 5/10
lookups: 0

also known as bzr

Technical Details

what runs on :4155

The Bazaar smart server uses a persistent TCP connection and a versioned, framed request/response protocol, beginning with a server greeting and then carrying repository operations. TCP 4155 is the conventional port for bzr:// access; the IANA registry also lists UDP, but the Bazaar smart-server protocol is TCP-based. The bzr+ssh:// transport instead carries the protocol through SSH, commonly on port 22.

Security Information

exposure of :4155

risk score

5/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

system averages 2.7 across 928 ports — this one sits 2.3 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Plain bzr:// traffic is not encrypted by default, so repository data and operations can be exposed to network observers. Access and write permissions depend on how the server is launched and the permissions of its service account; avoid exposing it publicly unless access is deliberately controlled, and prefer bzr+ssh:// across untrusted networks. Internet-wide scan data provided for this entry has no observations of the port open.

Record

iana registry entry

port: :4155
service: Bazaar Smart Server
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: System
usage: Bazaar (bzr) uses TCP port 4155 for its smart server, serving remote repository operations to Bazaar clients. It is most likely to appear on a self-hosted or legacy Bazaar installation; the IANA assignment is registered to Martin Pool.
lookups: 0rank 993
added: 2026-10-03
updated: 2026-10-03
references: IANA service name registry — port 4155

Something wrong?

This record is maintained by the engineers who use port 4155. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-03.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 928 in system →

the 8 most looked-up other ports in system — 928 ports carry that label.

port	service	proto	category	risk	views
:8888	Sun Answerbook & Alt HTTP	TCP	Web Services	caution	123.9k
:4664	Google Desktop Search	TCP	System	caution	67.2k
:8008	IBM HTTP Server Admin	TCP	Web Services	caution	58.3k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:9080	WebSphere HTTP Transport (default)	TCP	Web Services	caution	51.6k
:23	Telnet	TCP	Remote Access	caution	34.8k
:12489	NSClient Monitoring Agent	TCP	Network Services	caution	30.0k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4155Bazaar Smart Server

Technical Details

Security Information

Related Ports

Port 4155Bazaar Smart Server