Port 7784Seamless Bidirectional Forwarding Detection (S-BFD)

UDP port 7784 carries S-BFD control packets for checking network-path and forwarding-element reachability.

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

also known as s-bfd

Technical Details

what runs on :7784

UDP destination port 7784 is assigned for S-BFD Control packets, as specified in RFC 7880. S-BFD uses BFD control-packet formats but avoids setting up a conventional BFD session with every monitored endpoint: an initiator sends a packet identifying the target with its discriminator, and an S-BFD reflector replies. The exchange is connectionless; there is no TCP handshake or application stream framing.

Security Information

exposure of :7784

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 1,795 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

S-BFD traffic is not encrypted, and an open UDP port may expose a network device’s control-plane handling to probing or packet floods. Keep it reachable only from intended network peers and apply the device’s control-plane filtering and rate limits; it is not normally a service to expose to the public internet.

Record

iana registry entry

port: :7784
service: Seamless Bidirectional Forwarding Detection (S-BFD)
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: S-BFD is used by routers and other network devices to monitor reachability across paths or to forwarding elements. You are most likely to encounter it on a network device’s control plane, not as an application service intended for general internet access.
lookups: 0rank 993
added: 2026-10-13
updated: 2026-10-13
references: IANA service name registry — port 7784
RFC 7881

Something wrong?

This record is maintained by the engineers who use port 7784. 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 2026-10-13.

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :7784Seamless Bidirectional Forwarding Detection (S-BFD)

Technical Details

Security Information

Related Ports

Port 7784Seamless Bidirectional Forwarding Detection (S-BFD)