Port 6620Kerberos V5 FTP Data

Assigned for the data channel of Kerberos V5 FTP; no common deployment is widely documented.

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

also known as kftp-data

Technical Details

what runs on :6620

Kerberos V5 FTP Data is registered on port :6620 over tcp and udp to Robert J Scott, assigned August 2005. 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 :6620

this machine

# linux
sudo ss -tulpn 'sport = :6620'

# macos / bsd
sudo lsof -nP -i :6620

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :6620

another host

nmap -sV -p T:6620 <host>
sudo nmap -sU -sV -p U:6620 <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 :6620

risk score

1/ 10safe

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

file transfer averages 3.4 across 192 ports — this one sits 2.4 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 :6620 yet

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

Record

iana registry entry

port: :6620
service: Kerberos V5 FTP Data
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: File Transfer
usage: IANA assigns TCP and UDP port 6620 to the Kerberos V5 FTP data service. The assignment is held by Robert J Scott, but the port is not known as a commonly encountered listener.
lookups: 0rank 993
added: 2026-10-11
updated: 2026-10-11
references: IANA service name registry — port 6620

Something wrong?

This record is maintained by the engineers who use port 6620. 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 2026-10-11.

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

all 192 in file transfer →

the 8 most looked-up other ports in file transfer — 192 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:17500	Dropbox LAN Sync	TCPUDP	File Transfer	caution	43.7k
:548	Apple Filing Protocol	TCP	File Transfer	caution	36.8k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k
:1337	PowerFolder P2P	TCP	Security	caution	27.1k
:9001	SharePoint Authoring		Web Services	caution	26.3k
:8080	FilePhile Relay	UDP	File Transfer	caution	25.6k
:1337	WASTE Encrypted Sharing	TCP	Security	caution	22.9k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :6620Kerberos V5 FTP Data

Technical Details

Security Information

Related Ports

Port 6620Kerberos V5 FTP Data