Port 6633Cisco vPath Services Overlay

UDP 6633 carries Cisco vPath overlay traffic for service chaining in virtualized data-center networks.

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

also known as cisco-vpath-tun

Technical Details

what runs on :6633

This is Cisco vPath's UDP tunnel traffic, used to steer or carry workload packets between virtual switching components and virtual network-service appliances. UDP has no connection handshake; the tunnel uses Cisco-specific encapsulation rather than a general-purpose application protocol, and its framing and endpoint configuration are platform-specific. The IANA assignment is UDP 6633; TCP 6633 is a separate port use and should not be inferred from this assignment.

Security Information

exposure of :6633

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 1,734 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

Treat this as internal data-plane traffic, not a service intended for the public internet. Exposure could allow unwanted traffic to reach vPath endpoints or service appliances; restrict it to trusted virtualization and service-network interfaces. Do not assume the overlay encrypts its payload by default.

Record

iana registry entry

port: :6633
service: Cisco vPath Services Overlay
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Virtualization
usage: In Cisco Nexus 1000V deployments, vPath uses this port for overlay traffic between virtual switching components and vPath-aware service appliances, such as Cisco virtual security gateways. It is generally encountered on internal data-center networks, not as a public-facing service.
lookups: 0rank 993
added: 2026-10-11
updated: 2026-10-11
references: IANA service name registry — port 6633

Something wrong?

This record is maintained by the engineers who use port 6633. 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 2026-10-11.

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edit this record →back to the registry

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all 1,734 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :6633Cisco vPath Services Overlay

Technical Details

Security Information

Related Ports

Port 6633Cisco vPath Services Overlay