Port 1921NoAdmin

NoAdmin service traffic uses TCP and UDP port 1921.

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

Technical Details

what runs on :1921

no technical write-up for :1921 yet

the handshake, the implementations you meet in the wild, the flags that matter. we have the registry entry — the detail comes from the engineers who run it.

add technical details

Security Information

exposure of :1921

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 :1921 yet

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

Record

iana registry entry

port: :1921
service: NoAdmin
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: TCP and UDP port 1921 is assigned to the NoAdmin service. The assignment is registered to Martin Bestmann, but public protocol and deployment details are not recorded.
lookups: 0rank 994
added: 2026-08-24
updated: 2026-08-24
references: IANA service name registry — port 1921

Something wrong?

This record is maintained by the engineers who use port 1921. 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 2026-08-24.

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 :1921, by lookups.

port	service	proto	category	risk	views
:1920	IBM Tivoli Monitoring	TCPtls	Web Services	caution	21.5k
:1984	Big Brother Monitor	TCP	Security	caution	16.8k
:1863	Microsoft Notification Protocol	TCP	Voice and Chat	caution	15.9k
:1947	Aladdin HASP License Manager	TCP	Security	caution	15.4k
:1900	SSDP / UPnP Discovery	UDP	Network Services	caution	14.6k
:1883	MQTT Broker	TCP	Network Services	caution	14.2k
:1967	Cisco IP SLA Control	UDP	Network Services	caution	13.2k
:1935	RTMP	TCP	Web Services	safe	11.1k

risk mix of the 8 listed

safe13%
caution88%

1 of 8 encrypted

Port :1921NoAdmin

Technical Details

Security Information

Related Ports

Port 1921NoAdmin