Port 3147RFIO (Remote File I/O)

RFIO provides remote file access, traditionally for CERN CASTOR storage systems and related scientific computing environments.

inFile Transfer System

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 5/10
lookups: 0

also known as rfiod

Technical Details

what runs on :3147

RFIO normally uses TCP port 3147 for client-to-server remote file operations; UDP is also registered, but TCP is the transport generally associated with the service. Clients use RFIO libraries and tools such as rfcp, rfio_cat, and directory or metadata commands to access files through an RFIO daemon. It is a purpose-built file protocol rather than SMB or NFS, and legacy deployments generally do not provide transport encryption by default.

Security Information

exposure of :3147

risk score

5/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

file transfer averages 3.8 across 149 ports — this one sits 1.2 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

RFIO should not be exposed directly to the public Internet. An exposed daemon may provide access to sensitive research or operational data, and legacy deployments can rely on weak or site-specific authentication while transmitting traffic without modern transport encryption. Restrict port 3147 to trusted storage clients and replace or isolate obsolete deployments where possible.

Record

iana registry entry

port: :3147
service: RFIO (Remote File I/O)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: File Transfer System
usage: RFIO is the client/server remote file-access protocol used by CERN software such as CASTOR, with the rfiod daemon serving files to RFIO clients. Engineers may encounter it on legacy scientific data-storage systems, although it is uncommon on general-purpose networks.
lookups: 0rank 994
added: 2026-09-04
updated: 2026-09-04
references: IANA service name registry — port 3147

Something wrong?

This record is maintained by the engineers who use port 3147. 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 2026-09-04.

01edit any field on a page of its own
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edit this record →back to the registry

Related Ports

all 149 in file transfer →

the 8 most looked-up other ports in file transfer — 149 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 :3147RFIO (Remote File I/O)

Technical Details

Security Information

Related Ports

Port 3147RFIO (Remote File I/O)