Port 564Plan 9 File Service (9P)

9P is Plan 9’s network filesystem protocol, used by Plan 9, Inferno, and Linux v9fs clients.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

also known as 9pfs, 9P, 9P2000, Styx, v9fs

Technical Details

what runs on :564

9P is a client-server filesystem protocol. A client begins with a version exchange, then authenticates or attaches to a filesystem namespace and performs operations such as walk, open, read, write, and stat. Messages are length-prefixed and tagged for request/response matching; common dialects include 9P2000 and 9P2000.L. IANA lists both TCP and UDP for this service, although deployed network implementations commonly use TCP or non-IP transports such as local or virtio connections. The protocol does not provide encryption by default.

Security Information

exposure of :564

risk score

6/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

file transfer averages 4.0 across 132 ports — this one sits 2.0 above.

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

An exposed 9P endpoint can disclose or modify the filesystem namespace made available by the server, depending on its authentication and permission configuration. Because traffic is normally cleartext and the service is uncommon on the public Internet, it should generally be restricted to trusted networks or protected with an external secure transport rather than directly exposed.

Record

iana registry entry

port: :564
service: Plan 9 File Service (9P)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: File Transfer System
usage: Port 564 is the conventional network endpoint for 9P, the filesystem protocol used by Plan 9 and Inferno systems. Engineers may also encounter it with Linux v9fs mounts or related virtualization and container integrations, usually on private networks.
lookups: 0rank 994
added: 2026-08-27
updated: 2026-08-27
references: IANA service name registry — port 564

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This record is maintained by the engineers who use port 564. 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 2026-08-27.

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Related Ports

all 132 in file transfer →

the 8 most looked-up other ports in file transfer — 132 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 :564Plan 9 File Service (9P)

Technical Details

Security Information

Related Ports

Port 564Plan 9 File Service (9P)