Port 1121Datalode RMPP

Datalode RMPP is the service assigned to TCP and UDP port 1121.

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

Technical Details

what runs on :1121

Datalode RMPP is registered on port :1121 over tcp and udp to Dave Ruedger, assigned November 2003. 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 :1121

this machine

# linux
sudo ss -tulpn 'sport = :1121'

# macos / bsd
sudo lsof -nP -i :1121

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :1121

another host

nmap -sV -p T:1121 <host>
sudo nmap -sU -sV -p U:1121 <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 :1121

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 :1121 yet

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

Record

iana registry entry

port: :1121
service: Datalode RMPP
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The assignment identifies Datalode RMPP on TCP and UDP port 1121. It was registered by Dave Ruedger on 2003-11-01; broader deployment details are not established.
lookups: 0rank 993
added: 2026-09-09
updated: 2026-09-09
references: IANA service name registry — port 1121

Something wrong?

This record is maintained by the engineers who use port 1121. 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 2026-09-09.

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 :1121, by lookups.

port	service	proto	category	risk	views
:1080	SOCKS Proxy	TCPtls	Security	caution	16.1k
:1059	IBM AIX NIM	TCPUDP	Network Services	caution	15.6k
:1058	IBM AIX NIM	TCPUDP	Network Services	caution	13.5k
:1182	AcceleNet ITP	TCPUDP	Network Services	caution	12.4k
:1110	EasyBits School Discovery	UDP	Network Services	caution	11.1k
:1169	Tripwire	TCPUDP	Security	caution	9.4k
:1167	Conference Call Signaling	UDP	Network Services	caution	9.1k
:1140	AutoNOC	TCPUDP	Network Services	caution	8.7k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :1121Datalode RMPP

Technical Details

Security Information

Related Ports

Port 1121Datalode RMPP