Port 3161DOC1 License Manager

TCP and UDP port 3161 is assigned to DOC1 License Manager, a service with little public deployment evidence.

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

also known as doc1lm

Technical Details

what runs on :3161

DOC1 License Manager is registered on port :3161 over tcp and udp to Greg Goodson. 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 never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :3161

this machine

# linux
sudo ss -tulpn 'sport = :3161'

# macos / bsd
sudo lsof -nP -i :3161

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :3161

another host

nmap -sV -p T:3161 <host>
sudo nmap -sU -sV -p U:3161 <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 :3161

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 :3161 yet

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

Record

iana registry entry

port: :3161
service: DOC1 License Manager
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns this port to DOC1 License Manager and lists Greg Goodson as the registrant. Public evidence does not establish how commonly it runs or what products currently use it.
lookups: 0rank 993
added: 2026-09-27
updated: 2026-09-27
references: IANA service name registry — port 3161

Something wrong?

This record is maintained by the engineers who use port 3161. 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 2026-09-27.

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 :3161, by lookups.

port	service	proto	category	risk	views
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:3100	Tatsoft HTTP Port	TCP	Web Services	caution	19.4k
:3101	BlackBerry BES Cloud Comm	TCP	Cloud	caution	7.1k
:3225	FCIP	TCPUDP	Databases	caution	4.5k
:3211	Avocent Secure Management	TCPUDPtls	Security	safe	0
:3162	SFLM	TCPUDP	—	safe	0
:3170	SERVERVIEW-ASN	TCPUDP	—	safe	0

risk mix of the 8 listed

safe38%
caution63%

1 of 8 encrypted

Port :3161DOC1 License Manager

Technical Details

Security Information

Related Ports

Port 3161DOC1 License Manager