Port 1321PIP

PIP is an IANA-registered service on TCP and UDP port 1321, assigned to Gordon Mohr.

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

Technical Details

what runs on :1321

PIP is registered on port :1321 over tcp and udp to Gordon Mohr. 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 :1321

this machine

# linux
sudo ss -tulpn 'sport = :1321'

# macos / bsd
sudo lsof -nP -i :1321

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :1321

another host

nmap -sV -p T:1321 <host>
sudo nmap -sU -sV -p U:1321 <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 :1321

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 :1321 yet

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

Record

iana registry entry

port: :1321
service: PIP
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: TCP and UDP port 1321 is assigned by IANA to the service name PIP, registered to Gordon Mohr. No broadly documented implementation or operational usage is established from the assignment alone.
lookups: 0rank 993
added: 2026-09-11
updated: 2026-09-11
references: IANA service name registry — port 1321

Something wrong?

This record is maintained by the engineers who use port 1321. 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 2026-09-11.

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 :1321, by lookups.

port	service	proto	category	risk	views
:1337	PowerFolder P2P	TCP	Security	caution	27.1k
:1311	Dell OpenManage	TCPtls	Remote Access	caution	26.6k
:1337	Men & Mice DNS	UDP	Network Services	safe	24.8k
:1337	WASTE Encrypted Sharing	TCP	Security	caution	22.9k
:1293	IPSec	TCPUDPtls	Security	caution	17.8k
:1270	SCOM Agent	TCPUDP	Network Services	caution	15.6k
:1313	Xbiim Canvii Server	TCP	Web Services	caution	12.4k
:1319	AMX ICSP	TCP	Network Services	caution	12.4k

risk mix of the 8 listed

safe13%
caution88%

2 of 8 encrypted

Port :1321PIP

Technical Details

Security Information

Related Ports

Port 1321PIP