Port 20049NFS over RDMA

NFS over RDMA carries Network File System traffic across RDMA-capable networks, typically in high-performance computing and storage environments.

inFile Transfer Network Services

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

also known as nfsrdma, RPC-over-RDMA

Technical Details

what runs on :20049

NFS over RDMA transports ONC RPC/NFS using RPC-over-RDMA: RDMA connection setup is followed by RPC/RDMA messages, with bulk data moved directly between registered memory buffers where possible. The conventional service port is 20049; clients may discover it through rpcbind on port 111 or configure the port directly. Although IANA lists TCP, UDP, and SCTP for this assignment, NFS/RDMA deployments use an RDMA-capable transport and connection-management path rather than treating it as an ordinary NFS-over-TCP or UDP socket.

Security Information

exposure of :20049

risk score

6/ 10risk

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

file transfer averages 3.3 across 210 ports — this one sits 2.7 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 · sctp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

NFS over RDMA is not encrypted by default, and RDMA does not itself provide NFS authentication or authorization. Keep it on a trusted storage fabric; internet exposure can reveal or allow access to exported files depending on export rules and authentication, so restrict network reachability and use appropriate NFS security and export controls.

Record

iana registry entry

port: :20049
service: NFS over RDMA
transport: TCPUDPSCTP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: File Transfer Network Services
usage: This is the IANA service port for NFS over RDMA, used by NFS servers and clients on RDMA-capable networks such as InfiniBand or RoCE. It is most likely to be encountered in HPC clusters and specialized storage deployments, not on ordinary public-facing servers.
lookups: 0rank 993
added: 2026-10-18
updated: 2026-10-18
references: IANA service name registry — port 20049
RFC 8267

Something wrong?

This record is maintained by the engineers who use port 20049. 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 2026-10-18.

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Related Ports

all 210 in file transfer →

the 8 most looked-up other ports in file transfer — 210 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 :20049NFS over RDMA

Technical Details

Security Information

Related Ports

Port 20049NFS over RDMA