Port 4785Cisco Nexus Control Protocol

UDP port 4785 carries control traffic between Cisco Nexus 1000V virtual supervisor and virtual Ethernet modules.

transport: udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as cncp

Technical Details

what runs on :4785

CNCP uses UDP port 4785 for control-plane messages between a Nexus 1000V VSM and its VEMs, including communication needed to manage the virtual switches. It uses UDP datagrams rather than a TCP session; its message framing is proprietary rather than a general-purpose, standardized application protocol. This is distinct from VXLAN, which commonly uses UDP port 4789.

Security Information

exposure of :4785

risk score

2/ 10safe

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

network services averages 2.6 across 1,584 ports — this one sits 0.6 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

udp

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

security overview

Keep UDP/4785 reachable only between the Nexus 1000V control components that need it; it should not be exposed to the public internet. Because it carries virtual-switch control traffic, an unintended reachable listener could be a target for disruption or attempted protocol abuse. Do not assume the traffic is encrypted in transit.

Record

iana registry entry

port: :4785
service: Cisco Nexus Control Protocol
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Virtualization
usage: CNCP is used in Cisco Nexus 1000V deployments for communication between the Virtual Supervisor Module (VSM) and Virtual Ethernet Modules (VEMs). Engineers are most likely to encounter it on the network connecting those components, rather than on a general-purpose server.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 4785

Something wrong?

This record is maintained by the engineers who use port 4785. 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.

01edit any field on a page of its own
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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 :4785Cisco Nexus Control Protocol

Technical Details

Security Information

Related Ports

Port 4785Cisco Nexus Control Protocol