Port 4754GRE-in-UDP Encapsulation

UDP port 4754 carries GRE packets inside UDP datagrams, typically to support tunnel traffic across load-balanced networks.

inNetwork Services

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

also known as RFC 8086

Technical Details

what runs on :4754

GRE-in-UDP encapsulates a GRE packet in a UDP datagram, using UDP destination port 4754 as specified by RFC 8086. It is connectionless and has no application-level handshake: a configured endpoint receives the UDP datagram and processes its payload as GRE. The GRE payload retains GRE's own header and encapsulated network packet; this is distinct from native GRE, which uses IP protocol number 47 rather than a TCP or UDP port. The encapsulation itself does not provide encryption.

Security Information

exposure of :4754

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 1,579 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

GRE-in-UDP does not authenticate peers or encrypt tunnel traffic by itself. An exposed endpoint may accept unwanted tunnel traffic or be targeted with spoofed or malformed packets, depending on its implementation and configuration. It is generally best restricted to configured peer addresses and protected with network-layer filtering; do not treat the nonstandard-looking port as a security control.

Record

iana registry entry

port: :4754
service: GRE-in-UDP Encapsulation
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This is a standards-defined tunnel encapsulation, not a general-purpose application service. Engineers may encounter it on configured network devices or tunnel endpoints that carry GRE over UDP, particularly where UDP flows help underlay networks distribute traffic across paths.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 4754
RFC 8086

Something wrong?

This record is maintained by the engineers who use port 4754. 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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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4754GRE-in-UDP Encapsulation

Technical Details

Security Information

Related Ports

Port 4754GRE-in-UDP Encapsulation