Port 677Virtual Presence Protocol

Virtual Presence Protocol traffic assigned to TCP and UDP port 677.

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

also known as vpp

Technical Details

what runs on :677

Virtual Presence Protocol is registered on port :677 over tcp and udp to Klaus Wolf. 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 :677

this machine

# linux
sudo ss -tulpn 'sport = :677'

# macos / bsd
sudo lsof -nP -i :677

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :677

another host

nmap -sV -p T:677 <host>
sudo nmap -sU -sV -p U:677 <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 :677

risk score

1/ 10safe

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

network services averages 2.6 across 1,582 ports — this one sits 1.6 below.

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 :677 yet

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

Record

iana registry entry

port: :677
service: Virtual Presence Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: TCP and UDP port 677 are assigned to the Virtual Presence Protocol (VPP). The assignment is registered to Klaus Wolf, but the protocol has little visible public deployment and is rarely observed in internet-wide scans.
lookups: 0rank 993
added: 2026-09-15
updated: 2026-09-15
references: IANA service name registry — port 677

Something wrong?

This record is maintained by the engineers who use port 677. 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 2026-09-15.

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

all 1,582 in network services →

the 8 most looked-up other ports in network services — 1,582 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :677Virtual Presence Protocol

Technical Details

Security Information

Related Ports

Port 677Virtual Presence Protocol