Port 429OCS-AMU

Historic OCS-AMU assignment on TCP/UDP 429; not suitable for modern service-discovery use.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

Technical Details

what runs on :429

OCS-AMU is registered on port :429 over tcp and udp to Florence Wyman. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :429

this machine

# linux
sudo ss -tulpn 'sport = :429'

# macos / bsd
sudo lsof -nP -i :429

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :429

another host

nmap -sV -p T:429 <host>
sudo nmap -sU -sV -p U:429 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :429

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

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

no security notes recorded for :429 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :429
service: OCS-AMU
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: OCS-AMU is a historic service assignment for both TCP and UDP port 429. The assignment is registered to Florence Wyman, but the registry provides no further product or deployment details.
lookups: 0rank 993
added: 2026-08-29
updated: 2026-08-29
references: IANA service name registry — port 429

Something wrong?

This record is maintained by the engineers who use port 429. 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 2026-08-29.

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

browse categories →

ports registered around :429, by lookups.

port	service	proto	category	risk	views
:443	HTTPS	TCPtls	Web Services	caution	65.9k
:445	Microsoft-DS / SMB	TCP	File Transfer	caution	22.3k
:475	tcpnethaspsrv	TCP	Security	caution	20.7k
:427	Service Location Protocol	TCPUDP	Network Services	caution	14.6k
:384	Remote Server System	TCPUDP	Remote Access	caution	11.5k
:383	HP Data Alarm Manager	TCPUDP	Network Services	caution	11.1k
:369	RPC2 Port Mapper	TCPUDP	Network Services	caution	11.1k
:464	Kerberos Password Change	TCPUDP	Security	safe	10.6k

risk mix of the 8 listed

safe13%
caution88%

1 of 8 encrypted

Port :429OCS-AMU

Technical Details

Security Information

Related Ports

Port 429OCS-AMU