Port 6635MPLS-in-UDP

UDP port 6635 carries MPLS packets in tunnels between configured network endpoints.

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

also known as mpls-udp, MPLS over UDP

Technical Details

what runs on :6635

MPLS-in-UDP is specified in RFC 7510. A sender places an MPLS label stack and its packet payload after the UDP header, using UDP destination port 6635; the receiver decapsulates the datagram and processes the MPLS packet. UDP has no connection handshake, and the encapsulation does not itself negotiate parameters or provide encryption. It is a distinct MPLS encapsulation from alternatives such as MPLS-in-GRE.

Security Information

exposure of :6635

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 1,735 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

MPLS-in-UDP provides no built-in encryption or peer authentication. An exposed endpoint may accept spoofed or unauthorized tunnel traffic, so restrict access to known tunnel peers and use network controls or separate security mechanisms where needed. This is not normally a public-facing service, and internet-wide scans have not commonly observed it open.

Record

iana registry entry

port: :6635
service: MPLS-in-UDP
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 3/10caution
category: Network Services
usage: This is a network-tunnelling protocol, not a typical application service: configured tunnel endpoints use it to carry MPLS traffic across an IP network. It is generally encountered in operator or data-center networks, and an open UDP port alone does not confirm that a tunnel is active.
lookups: 0rank 993
added: 2026-10-11
updated: 2026-10-11
references: IANA service name registry — port 6635
RFC 7510

Something wrong?

This record is maintained by the engineers who use port 6635. 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.

01edit any field on a page of its own
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edit this record →back to the registry

Related Ports

all 1,735 in network services →

the 8 most looked-up other ports in network services — 1,735 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :6635MPLS-in-UDP

Technical Details

Security Information

Related Ports

Port 6635MPLS-in-UDP