Port 4791RoCE v2 (RDMA over Converged Ethernet)

UDP port 4791 carries routable RoCE v2 traffic for RDMA across IP networks, typically within data-center fabrics.

transport: udp
in transit: cleartext
assignment: official
risk: 3/10
lookups: 0

also known as RDMA over Converged Ethernet

Technical Details

what runs on :4791

UDP destination port 4791 is the standard port for RoCE v2, the routable form of RDMA over Converged Ethernet. It carries InfiniBand transport packets encapsulated in UDP/IP, allowing RDMA traffic to cross IP-routed networks; unlike TCP services, it does not establish a TCP connection or present a conventional application handshake. RoCE v1 is a distinct, non-routable Ethernet-layer variant and does not use this UDP port. RoCE deployments commonly rely on compatible RNICs and carefully configured data-center networks.

Security Information

exposure of :4791

risk score

3/ 10caution

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

network services averages 2.6 across 1,589 ports — this one sits 0.4 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

udp

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

security overview

RoCE traffic is not encrypted by default, and the protocol is intended for controlled fabrics, not general internet exposure. Restrict UDP/4791 to expected hosts and network segments; unexpected reachability can expose RDMA-capable endpoints to malformed traffic or resource-exhaustion risks, though this is not a typical login or general-purpose remote-control service.

Record

iana registry entry

port: :4791
service: RoCE v2 (RDMA over Converged Ethernet)
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 3/10caution
category: Network Services
usage: RoCE v2-capable network adapters use this port for RDMA traffic in data-center, storage, and high-performance computing fabrics. Engineers are most likely to encounter it on hosts configured for low-latency, high-throughput communication rather than on general-purpose internet-facing servers.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 4791

Something wrong?

This record is maintained by the engineers who use port 4791. 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 2026-10-06.

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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4791RoCE v2 (RDMA over Converged Ethernet)

Technical Details

Security Information

Related Ports

Port 4791RoCE v2 (RDMA over Converged Ethernet)